LP0571 4X/IP65 PAXLBK30 FCOR0000 ZCAT3035-1330A 28B2029-0A0 FN610-1/07 LFIL0000 - Datasheet Archive

 

Drawing No. LP0571 Effective 8/03 Tel +1 (717) 767-6511 Fax +1 (717) 764-0839 www.redlion-controls.com MODEL PAXLSG - PAX LITE

 

Bulletin No. PAXLSG-X Drawing No. LP0571 LP0571 Effective 8/03 Tel +1 (717) 767-6511 Fax +1 (717) 764-0839 www.redlion-controls.com MODEL PAXLSG - PAX LITE STRAIN GAGE METER / MILLIVOLT METER ! 3 1/2-DIGIT, 0.56" (14.2 mm) HIGH LED READOUT ! HIGH SENSITIVITY, 10 mV FULL SCALE ! WIDE RANGE GAIN AND OFFSET ADJUSTMENTS ! BUILT-IN EXCITATION 5 OR 10 VDC ! APPLICABLE AS REGULAR MILLIVOLT INDICATOR (Single-ended or Differential Input) ! SELECTABLE DECIMAL POINTS ! OVER-RANGE INDICATION ! ! NEMA 4X/IP65 4X/IP65 SEALED FRONT BEZEL OPTIONAL CUSTOM UNITS OVERLAY WITH BACKLIGHT GENERAL DESCRIPTION SAFETY SUMMARY The Model PAXLSG expands the PAX Lite capabilities into the indication of pressure, load, force, and other parameters measured with strain gages. The unit features broad range scaling and can be used with a wide variety of strain gage resistances and bridge configurations. A built-in excitation source is jumper selectable for 5 or 10 VDC @ 120 mA maximum, and can power up to four full 350 bridges in load averaging applications. Although designed primarily for strain-gage indication, the PAXLSG is also ideal for single-ended or differential millivolt input applications, with full-scale input ranges from 0 to 10 mV thru 0 to 2 VDC. Adjustable scaling and offset allow direct readout in nearly any engineering unit. The meter has a NEMA 4X/IP65 4X/IP65 sealed bezel and extensive testing of noise effects to CE requirements, allowing the meter to provide a tough yet reliable application solution. All safety related regulations, local codes and instructions that appear in the literature or on equipment must be observed to ensure personal safety and to prevent damage to either the instrument or equipment connected to it. If equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. DIMENSIONS In inches (mm) CAUTION: Read complete instructions prior to installation and operation of the unit. CAUTION: Risk of electric shock. Note: Recommended minimum clearance (behind the panel) for mounting clip installation is 2.1" (53.4) H x 5.0" (127) W. 1 TABLE OF CONTENTS Ordering Information . . . . . . . . . . . General Meter Specifications . . . . Accessories . . . . . . . . . . . . . . . . . Installing the Meter . . . . . . . . . . . . Setting the Jumpers and Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 3 4 4 Wiring the Meter . . . . Scaling the Meter . . . Calibrating the Meter. Applications . . . . . . . . . . . ORDERING INFORMATION Meter Part Numbers PAXL SG 0 0 SG - Strain Gage Meter Accessories Part Numbers TYPE MODEL NO. Accessories PAXLBK DESCRIPTION PART NUMBERS Units Label Kit Accessory PAXLBK30 PAXLBK30 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6 7 8 GENERAL METER SPECIFICATIONS 1. DISPLAY: 3 1/2-digit, 0.56" (14.2 mm) high, 7-segment LED, (-) minus sign displayed when voltage is negative. Decimal points inserted before 1st, 2nd, or 3rd least significant digits by DIP switch selection. 2. OVER-RANGE INDICATION: Indicated by blanking 3 least significant digits. 3. POWER: AC Power: 85 to 250 VAC, 50/60 HZ, 15 VA Isolation: 2300 Vrms for 1 min. to all inputs. 4. INPUT SIGNAL: Single-ended or differential input, ±2.0 V max. Gain (Sensitivity) is adjustable from 200 Units of Numerical Readout/millivolt input (gives full scale readout of 1999 at 10 mV input), to less than 1 Unit of Numerical Readout/mV (gives full scale readout of 1999 at 2.0 V input). Maximum common mode voltage swing with respect to signal ground, 0 to 7 V. Note: Absolute maximum voltage that can be applied between the two input terminals or between input and signal common is 50 VDC. 5. INPUT IMPEDANCE: 100 M 6. LINEARITY: ±(0.05% ±1 digit) 7. LOW FREQUENCY NOISE REJECTION: Normal Mode Rejection: 84 dB @ 50/60 Hz Common Mode Rejection: 50 dB with respect to excitation common; 110 dB with respect to earth ground. 8. RESPONSE TIME: 2.0 seconds to settle from step input. 9. READING RATE: 2.5 updated readings/second, nominal. 10. EXCITATION SUPPLY: Jumper Selectable: 5 VDC @ 60 mA max., ±2% 10 VDC @ 120 mA max., ±2% Temperature coefficient (ratio metric): 20 ppm/°C max. 11. ENVIRONMENTAL CONDITIONS: Operating Temperature: 0° to 60°C Storage Temperature: -40° to 80°C Operating and Storage Humidity: 85% max. relative humidity (noncondensing) Span Temperature Coeff.: 100 PPM/°C Offset Temperature Coeff.: 100 PPM/°C Altitude: Up to 2000 meters 12. CERTIFICATIONS AND COMPLIANCES: SAFETY IEC 1010-1, EN 61010-1: Safety requirements for electrical equipment for measurement, control, and laboratory use, Part 1. Type 4X Enclosure rating (Face only), UL50 IP65 Enclosure rating (Face only), IEC 529 IP20 Enclosure rating (Rear of unit), IEC 529 ELECTROMAGNETIC COMPATIBILITY Emissions and Immunity to EN 61326: Electrical Equipment for Measurement, Control and Laboratory use. Immunity to Industrial Locations: Electrostatic discharge EN 61000-4-2 Criterion A 4 kV contact discharge 8 kV air discharge Electromagnetic RF fields EN 61000-4-3 Criterion B 10 V/m Fast transients (burst) EN 61000-4-4 Criterion B 2 kV power 2 kV signal Surge EN 61000-4-5 Criterion A 1 kV L-L, 2 kV L&N-E power 1 kV signal RF conducted interference EN 61000-4-6 Criterion A 3 V/rms Power frequency magnetic fields EN 61000-4-8 Criterion A 30 A/m Voltage dip/interruptions EN 61000-4-11 Criterion A 0.5 cycle Emissions: Emissions EN 55011 Class B Notes: 1. Criterion A: Normal operation within specified limits. 2. Criterion B: Temporary loss of performance from which the unit selfrecovers. 13. CONNECTIONS: High compression cage-clamp terminal block Wire Strip Length: 0.3" (7.5 mm) Wire Gage: 30-14 AWG copper wire Torque: 4.5 inch-lbs (0.51 N-m) max. 14. CONSTRUCTION: This unit is rated for NEMA 4X/IP65 4X/IP65 use. IP20 Touch safe. Installation Category II, Pollution Degree 2. One piece bezel/case. Flame resistant. Panel gasket and mounting clip included. 15. WEIGHT: 0.65 lbs (0.24 kg) ACCESSORIES UNITS LABEL KIT (PAXLBK) Each meter has a units indicator with backlighting that can be customized using the Units Label Kit. The backlight is controlled by a DIP switch. 3 1.0 INSTALLING THE METER Installation The PAX meets NEMA 4X/IP65 4X/IP65 requirements when properly installed. The unit is intended to be mounted into an enclosed panel. Prepare the panel cutout to the dimensions shown. Remove the panel latch from the unit. Slide the panel gasket over the rear of the unit to the back of the bezel. The unit should be installed fully assembled. Insert the unit into the panel cutout. While holding the unit in place, push the panel latch over the rear of the unit so that the tabs of the panel latch engage in the slots on the case. The panel latch should be engaged in the farthest forward slot possible. To achieve a proper seal, tighten the latch screws evenly until the unit is snug in the panel (Torque to approximately 7 in-lbs [79N-cm]). Do not over-tighten the screws. Installation Environment The unit should be installed in a location that does not exceed the maximum operating temperature and provides good air circulation. Placing the unit near devices that generate excessive heat should be avoided. The bezel should be cleaned only with a soft cloth and neutral soap product. Do NOT use solvents. Continuous exposure to direct sunlight may accelerate the aging process of the bezel. PANEL CUT-OUT 2.0 SETTING THE SWITCHES The meter has switches that must be checked and/or changed prior to applying power. To access the switches, remove the meter base from the case by firmly squeezing and pulling back on the side rear finger tabs. This should lower the latch below the case slot (which is located just in front of the finger tabs). It is recommended to release the latch on one side, then start the other side latch. JUMPERS AND Set-Up DIP Switches Two banks of DIP switches are located inside the meter. The 9 position bank of switches is used for calibrating the meter. The values of these switches is discussed in section 5.0 Calibrating the Meter. The bank of 4 switches located near the front display are used for the selection of decimal points and backlight annunciator. Selecting "ON" position enables the function. Excitation Range Jumper A jumper is used for selection of the 5 or 10 volt range. It is important that only one jumper position is used at a time. SWITCH FUNCTION 1 Decimal Point 1 (000.0) 2 Decimal Point 2 (00.00) 3 Decimal Point 3 (0.000) 4 Backlight Annunciator for Units Label PAXLSG Jumper Selection FRONT DISPLAY JUMPER SELECTIONS Main Circuit Board indicates factory setting. 4 3 2 1 D.P./ BACKLIGHT ON EXCITATION SELECT OFFSET SPAN ON The 1 2 3 4 5 6 7 8 9 OFFSET REAR TERMINALS 4 GAIN COARSE FINE 3.0 WIRING THE METER and portable two-way radios are used in close proximity or if the installation is near a commercial radio transmitter. 3. Signal or Control cables within an enclosure should be routed as far away as possible from contactors, control relays, transformers, and other noisy components. 4. In extremely high EMI environments, the use of external EMI suppression devices, such as ferrite suppression cores, is effective. Install them on Signal and Control cables as close to the unit as possible. Loop the cable through the core several times or use multiple cores on each cable for additional protection. Install line filters on the power input cable to the unit to suppress power line interference. Install them near the power entry point of the enclosure. The following EMI suppression devices (or equivalent) are recommended: Ferrite Suppression Cores for signal and control cables: Fair-Rite # 0443167251 (RLC #FCOR0000 FCOR0000) TDK # ZCAT3035-1330A ZCAT3035-1330A Steward #28B2029-0A0 28B2029-0A0 Line Filters for input power cables: Schaffner # FN610-1/07 FN610-1/07 (RLC #LFIL0000 LFIL0000) Schaffner # FN670-1 FN670-1.8/07 Corcom #1VR3 Note: Reference manufacturer's instructions when installing a line filter. 5. Long cable runs are more susceptible to EMI pickup than short cable runs. Therefore, keep cable runs as short as possible. 6. Switching of inductive loads produces high EMI. Use of snubbers across inductive loads suppresses EMI. Snubber: RLC#SNUB0000 SNUB0000. WIRING OVERVIEW Electrical connections are made via screw-clamp terminals located on the back of the meter. All conductors should conform to the meter's voltage and current ratings. All cabling should conform to appropriate standards of good installation, local codes and regulations. It is recommended that power supplied to the meter (AC) be protected by a fuse or circuit breaker. When wiring the meter, compare the numbers embossed on the back of the meter case against those shown in wiring drawings for proper wire position. Strip the wire, leaving approximately 0.3" (7.5 mm) bare lead exposed (stranded wires should be tinned with solder). Insert the lead under the correct screw-clamp terminal and tighten until the wire is secure. (Pull wire to verify tightness.) EMC INSTALLATION GUIDELINES Although this meter is designed with a high degree of immunity to ElectroMagnetic Interference (EMI), proper installation and wiring methods must be followed to ensure compatibility in each application. The type of the electrical noise, its source or the method of coupling into the unit may be different for various installations. Listed below are some EMC guidelines for successful installation in an industrial environment. 1. The meter should be mounted in a metal enclosure, which is properly connected to protective earth. 2. Never run Signal or Control cables in the same conduit or raceway with AC power lines, conductors feeding motors, solenoids, SCR controls, and heaters, etc. The cables should be run in metal conduit that is properly grounded. This is especially useful in applications where cable runs are long 3.1 POWER WIRING AC Power Excitation Power Terminal 1: VAC Terminal 2: VAC Terminal 3: Common Terminal 4: Excitation + 3.2 INPUT SIGNAL WIRING 2-Wire Single Ended Input 4-Wire Bridge Input 6-Wire Bridge Input DEADLOAD COMPENSATION BRIDGE COMPLETION RESISTORS In some cases, the combined deadload and liveload output may exceed the range of the input. To use this range, the output of the bridge can be offset a small amount by applying a fixed resistor across one arm of the bridge. This shifts the electrical output of the bridge downward to within the operating range of the meter. A 100 K ohm fixed resistor shifts the bridge output approximately -10 mV (350 ohm bridge, 10 V excitation). Connect the resistor between +SIG and -SIG. Use a metal film resistor with a low temperature coefficient of resistance. For single strain gage applications, bridge completion resistors must be employed externally to the meter. Only use metal film resistors with a low temperature coefficient of resistance. Load cells and pressure transducers are normally implemented as full resistance bridges and do not require bridge completion resistors. 5 4.0 SCALING THE METER PAXLSG SCHEMATIC DESCRIPTION OF OPERATION COARSE GAIN SELECT SWITCHES The Pax Lite Strain Gage Indicator (PAXLSG) consists of a digital voltmeter combined with a high-gain, differential input amplifier that has provision for wide range scaling adjustment (shown above). The unit also incorporates an excitation power supply (5 or 10 VDC) that delivers up to 120 mA. In the simplified schematic above, K1, K2, and K3 form a high-gain, high-stability, differential input preamplifier with a single ended output. The gain of this preamplifier is set up by coarse gain select switches S5 through S9. These switches can be turned on in combination to provide discrete steps of gain-range adjustment. The output of the preamplifier (K3 output) is applied to the summing amplifier (K4) through coarse and fine adjustable potentiometers. These adjustable potentiometers provide final vernier gain adjustment over a range of slightly more than 2:1. An adjustable offset voltage signal is also added in at the input of K4 for zero-balance or for applications where the transfer curve must be offset from zero. Each of the coarse gain select switches is marked with the amount of maximum gain it will contribute when turned on. They are turned on singly or in combination (adding up each of their gain contributions), to arrive at a maximum gain value that is just above the desired gain value. To achieve the desired gain of 70 Units/mV in the example just given, the following switches would be turned on: S6 (Gain 50) + S7 (Gain 16) + S8 (Gain 6.6) = 72.6 Units/mV With these switches ON, the coarse and fine vernier adjustments cover a gain range from about 36 Units/mV (½ of max.) to 72.6 Units/mV. The required gain of 70 Units/mV falls within this adjustable range. COARSE AND FINE GAIN ADJUSTMENTS Once the gain select switches have been set, the final gain calibration is made with the Coarse and Fine Gain adjustments. Both of these adjustments are 15Turn, screwdriver adjustable potentiometers that increase gain with clockwise rotation. The Coarse adjustment has a 2:1 range. The Fine adjustment has a range of 5-10% (depending on the setting of the Coarse adjustment). Both pots are located at the rear of the meter. GAIN ADJUSTMENTS Gain is defined as the Units of Numerical change seen on the display per mV (millivolt) of input signal change (disregarding display decimal points). In effect, gain determines the slope of the transfer curve and is expressed in Units/mV. OFFSET ADJUSTMENTS GAIN = (Max. Num. Readout) - (Min. Num. Readout) (Max. mV Input Sig.) - (Min. mV Input Sig.) Offset adjustments move the transfer curve up-and-down along the vertical axis without changing the slope (Gain). They are used to "balance" the output of transducers or to intentionally introduce an offset, such as tare-load compensation. The Fine Offset Adjustment is a 15-turn screwdriver adjustable potentiometer, located at the rear of the meter. It has a range of ±125 Numerical Units of offset which is sufficient for balancing the output of most transducers. The Coarse Offset Switches (S2, 3, and 4) can be used to add additional steps of offset. Like the coarse gain select switches, the offset switches are marked with the approximate value of offset contributed by each switch, and they can be turned on in combinations with each switch, contributing its value to the total. Switch S1 selects the polarity of the offset signal and can be set to either add or subtract the offset contribution of the switches. The maximum offset that can be obtained with all switches ON and the Fine Offset at its maximum is ±1000, which is one half of the full scale readout. Note: Disregarded Decimal Points in Readout. For example, if an PAXLSG is to display 50.0 @ 2 mV (min.) and 169.0 @ 19 mV (max.), the required gain will be: GAIN = 1690 Units - 500 Units 19 mV - 2 mV = 70 Units/mV Note: Remember, display decimal points are disregarded. To establish this gain, the settings of the coarse gain select switches must first be determined. These switches establish the maximum end of the 2:1 adjustment range of the coarse and fine vernier gain adjustments. 6 5.0 CALIBRATING THE METER There are three different methods that can be used to calibrate the PAXLSG, and the method chosen depends largely on the nature of the application. The three methods are: EXAMPLE: Readout is to be 5.00 Units @ 2 mV minimum, and 15.00 Units @ 18 mV maximum. The transducer is a 350 strain-gage bridge requiring 10 VDC excitation. Rs = 1500 - 500 = 1000 Units Vs = 18 mV - 2 mV = 16 mV GAIN = 1000 = 62.5 Units/mV 16 VOLTAGE CALIBRATION In this method, the transducer signal is simply replaced with an accurately measured input voltage that can be varied through the range normally delivered by the transducer (See Voltage Calibration Circuit, below). The PAXLSG is then adjusted to provide the proper readout. Note: While most strain gage readout applications are zero-based (i.e. zero readout @ zero input) this example was intentionally chosen because it included an offset reading at zero input. It will be used in the Calibration Procedure below to illustrate the most convenient way to handle offset situations without excessive interaction of gain and offset adjustments. If a zero-based example had been given, the minimum readout and input voltage would have both been zero. Rs and Vs would then simply be the maximum values of readout and input voltage respectively, gain would just be the ratio of (Max. Readout/Max. Input mV), and Steps 7 and 8 of the procedure below could be eliminated. SYSTEM CALIBRATION In this method, the transducer is connected to the input of the PAXLSG in the final installation, or in a bench set-up simulating the actual installation. Accurately known inputs are then applied to the transducer (i.e. load, pressure, force, etc.), and the PAXLSG adjustments are made to provide the desired indication. This method is usually preferable to the Voltage Calibration method since it calibrates both the transducer and the PAXLSG as a combination, and reduces the inherent risk of inaccuracy or errors accumulated by separate calibration. However, it can only be used in applications where the parameter to be indicated can be easily varied and accurately measured or established. It is also very awkward to use if an offset or transducer unbalance must be dealt with because of Offset/Gain adjustment interaction. CALIBRATION PROCEDURE 1. Set the Coarse Gain Select Switches, S5 through S9 to establish a maximum range just exceeding the required gain. Referring to the example given, the required gain was calculated to be 62.5 Units/mV. Setting switches S6 and S7 ON gives 50 + 16 = 66 Units/mV, which is just above the required amount. The following chart gives an approximate gain adjustment value for each switch: COMBINATION VOLTAGE/SYSTEM CALIBRATION SWITCH NUMBER SPAN VALUE 5 140 6 In applications where tare-load, offset, or substantial transducer unbalance exists and where high accuracy is required in the final indication, it may be desirable to voltage calibrate the unit first to get it very close to its final settings. Then, after final installation, the unit can be "tweaked" to its final settings while using accurately known inputs to the system. These various factors make it impossible to set up one calibration procedure to cover all applications. However, using the following information on Voltage Calibration together with the examples given should provide a good basis for handling virtually any calibration requirement. 50 7 16 8 6.6 9 3.3 All offset switches, S2, 3, and 4, should be off. 2. Connect the unit to the Calibration Circuit as shown. Set the excitation voltage range jumper to the 10 V position. 3. Place unit in the case and turn power on to the unit. Allow 10 minutes of warm-up time for stabilization. 4. Close the "Zero Switch" of the calibration circuit to obtain zero input voltage. Adjust the fine offset control to get a zero readout. 5. Open the "Zero Switch" of the calibrating circuit and set the input voltage to the calculated swing voltage, Vs. (Vs is 16 mV in the example given.) Now, adjust the Gain Coarse and Fine Controls to get a readout equal to the Readout Span. (Rs = 1000 Units in the example given.) 6. Repeat Step 4 and readjust zero if required. If zero readjustment was needed, repeat Step 5, then back to Step 4, etc., until Zero and Rs readings are acceptable. *7. Set the calibration voltage to the minimum input level (2 mV in this example). Record the meter reading (125 in this example). Power the meter down and remove it from the case. Set the Coarse Offset Select Switches to get the corresponding minimum readout (add the switch offset value(s) to the recorded meter reading). In the example given, the minimum readout was 500 units @ 2 mV, therefore setting switches 3 and 4 gives us 125 (meter reading) + 125 (SW4) + 250 (SW3) = 500. The following chart gives an approximate offset adjustment value for each switch. CALIBRATION EXAMPLE "Voltage Calibration" can be easily performed for any application, using the calibration circuit shown below. VOLTAGE CALIBRATION CIRCUIT (Using 350 Ohm Dummy Bridge) SWITCH NUMBER OFFSET VALUE 2 500 3 250 4 This 350 Ohms "Dummy Bridge" circuit delivers calibration voltages in ranges of 0 to ±22 mV, 0 to +44 mV, or 0 to -44 mV, depending on the setting of R2. The range can be increased or decreased by adjusting the value of R3 (shown as 40 K). An accurate reference millivoltmeter is used to set up the calibration voltage, and a "Zero Switch" facilitates balancing without readjusting the calibration voltage. High-stability metalized resistors (1% tol.) should be used. The use of a dummy bridge insures a common-mode voltage during calibration that is very similar to that of the actual transducer. 125 *8. Place unit in the case and turn power on to the unit. Use the fine offset adjustment to fine tune the desired minimum reading (500 in this example). Vary the input from the minimum to maximum levels and check the corresponding readouts. Fine-tune if necessary by readjusting the fine gain adjustment at the maximum end and the fine offset adjustment at the minimum end. (In the example, readout is 500 @ 2 mV min. and 1500 @ 18 mV max.) Alternate between minimum and maximum inputs as required until readout is within desired tolerance at the extremes.9. Set appropriate decimal point switch (S2 for the example given). SET-UP: Before starting the procedure, the Input Swing Voltage (Vs), the Readout Span (Rs) and the required GAIN must be determined. WHERE: Rs = (Max. Numerical Display) - (Min. Numerical Display) Disregard Decimal Points Vs = (mV in @ Max. Display) - (mV in @ Min. Display) GAIN = Rs = Units/mV Vs The unit is now ready for installation. * Steps 7 and 8 are not required in zero-based applications. 7 6.0 APPLICATIONS EXAMPLE #1 CALIBRATION PRESSURE READOUT & SYSTEM This illustration depicts a common application using a PAXLSG with a strain gage pressure transducer for pressure indication. The gain required to display 150 Units @ 20 mV is 150/20, or 7.5 Units/mV. Setting the Coarse Gain Select Switches S8 and S9 ON, gives a gain range of 6.6 + 3.3, or 9.9 Units/mV maximum, which brackets the required gain. The transducer curve is zero-based (i.e. zero readout at zero input), and can be easily System Calibrated. A variable pressure input is applied to the transducer with a "Dead-Weight Tester" and the Fine Offset is adjusted to give a readout of zero with no pressure applied. Then 150 PSI is applied, the Coarse and Fine Gain controls are adjusted for a readout of 150. Pressure is removed, zero is checked and readjusted with the Fine Offset control if needed. Pressure is varied between zero and maximum, with the Fine Gain and Offset adjustments retrimmed as needed until the readout is within tolerance. EXAMPLE #2 THE MODEL PAXLSG AS A MILLIVOLT METER The PAXLSG can be used as a scaleable millivolt meter and will accept either single-ended or differential inputs when connected as shown. Input signals are referenced to the negative (common) side of the excitation supply (Terminal 3). Maximum common-mode voltage (for differential input) is 0 to +7 VDC. EXAMPLE #3 MULTIPLE AVERAGE READING LOAD-CELL INPUT, The 120 mA excitation output capability of the PAXLSG allows it to operate multiple strain gage bridges. In this example, it is used to indicate the quantity of granular material held in a hopper that is supported by three load cells in a tripod mounting arrangement. The tare-weight of the empty hopper is about 30% of the full weight, requiring a significant offset for a zero readout when empty. The PAXLSG is first Voltage-Calibrated (using the known output of the load cells at the empty and full conditions). Then the unit is installed and fine trimmed (System Calibration) using known loads. LIMITED WARRANTY The Company warrants the products it manufactures against defects in materials and workmanship for a period limited to one year from the date of shipment, provided the products have been stored, handled, installed, and used under proper conditions. The Company's liability under this limited warranty shall extend only to the repair or replacement of a defective product, at The Company's option. The Company disclaims all liability for any affirmation, promise or representation with respect to the products. The customer agrees to hold Red Lion Controls harmless from, defend, and indemnify RLC against damages, claims, and expenses arising out of subsequent sales of RLC products or products containing components manufactured by RLC and based upon personal injuries, deaths, property damage, lost profits, and other matters which Buyer, its employees, or sub-contractors are or may be to any extent liable, including without limitation penalties imposed by the Consumer Product Safety Act (P.L. 92-573) and liability imposed upon any person pursuant to the Magnuson-Moss Warranty Act (P.L. 93-637), as now in effect or as amended hereafter. No warranties expressed or implied are created with respect to The Company's products except those expressly contained herein. The Customer acknowledges the disclaimers and limitations contained herein and relies on no other warranties or affirmations. Red Lion Controls Asia Red Lion Controls 20 Willow Springs Circle Red Lion Controls BV Basicweg 11b 31, Kaki Bukit Road 3, #06-04/05 TechLink York PA 17402 NL - 3821 BR Amersfoort Singapore 417818 Tel +1 (717) 767-6511 Tel +31 (0) 334 723 225 Tel +65 6744-6613 Fax +1 (717) 764-0839 Fax +31 (0) 334 893 793 Fax +65 6743-3360