T723-0000 T723-0001 12VDC 80VDC 60VDC 24/40VDC 741-F 721-0414-00-H

T723 Thermocouple Input Isolating, Field Configurable Two-Wire Transmitter Provides an Isolated Current Loop in Proportion to a

TRANSPAKTM T723 Thermocouple Input Isolating, Field Configurable Two-Wire Transmitter Provides an Isolated Current Loop in Proportion to a Thermocouple Input Description Benefits Eliminates Ground Loops Field Configurable Switch Selectable Input Ranges Integral Cold-Junction Compensation Wide Ranging Zero and Span Adjustability (80%) 600V Input to Output Isolation FM Safety Approval for Hazardous Installations The T723 offers a choice of J/K/T or E/R/S input ranges and 2 output ranges, which are field selectable via top-accessed DIP switches (see Tables 1-2). The T723 provides 600 VDC input to output isolation with outputs of either 4-20mA or 10-50mA. The current output is linear to the equivalent mV thermocouple signal and non-linear to temperature, which is useful in data acquisition systems that utilize linearizing software. Upscale burnout (maximum output with an open thermocouple) is standard. The T723 has 80% zero and span adjustability within any user selected input ranges shown in Table 1 and 2. For example, Range K1 of Table 1 specifies 0° to 500°C with a minimum span of 100°C (500°-100° = 400°, or 80%). This 80% adjustability allows the user to field calibrate the unit from the maximum (0 to 500°) down to any minimum (100°C) span (e.g. 14°C to 114°C) as long as that adjusted span remains within the selected 0 to 500°C range. The same is true for any user selectable range: all spans are field adjustable from 20% (minimum span) to 100% of the specified range. Application The T723 is useful in any application requiring isolation of a 2-wire loop current from a thermocouple input. Typical applications include energy management and data acquisition such as monitoring remote boiler temperatures. The output of the T723 can interface with a digital meter for direct display or interface with a computer for monitoring and control applications. The T723 is FM approved for intrinsically safe operation in Class I, Division 1, Groups A, B, C, and D; Nonincendive Class I Division 2, Groups A, B, C and D, and Classes II & III, Division 2, Group G hazardous locations when installed per manufacturer's drawing 790-0024-00. Refer to model F723 for NEMA 4, FM/CSA/CENELEC approved explosion proof, field mount housing. Options B Downscale Burnout (minimum output with an open TC) Urethane coating of internal circuitry for protection from corrosive atmospheres is included as standard. Calibration Factory settings are: Table 1: T723-0000 T723-0000 Input Ranges TC Type/Range Input Range: J1 Output Range: 4-20mA J1 °C Switch Position °F Input Limits Minimum Span Input Limits Minimum Span 0 to 500 100 0 to 900 200 J2 1. Open the access lid on the top of the unit (see Top View Diagrams). 0 to 760 150 0 to 1400 -200 to 600 200 -350 to 1100 K1 0 to 500 100 0 to 900 200 0 to 1900 K3 0 to 1370 300 0 to 2500 500 -270 to 500 200 -450 to 900 400 T1 0 to 400 100 0 to 750 150 T2 -270 to 400 200 -450 to 750 350 = 1 = ON or Closed Table 2: T723-0001 T723-0001 Input Ranges TC Type/Range °C Switch Position °F 0 to 150 30 0 to 300 60 0 to 300 60 0 to 6000 120 0 to 500 100 0 to 950 200 0 to 1000 200 0 to 1800 400 E5 -270 to 0 100 -450 to 0 160 E6 -270 to 150 150 -450 to 300 200 E7 -270 to 350 200 -450 to 650 350 E8 8. Repeat fine zero and span adjustment for maximum accuracy Minimum Span E4 -270 to 850 300 -450 to 1550 550 R/S1 0 to 950 220 0 to 1700 400 R/S2 Key: Input Limits E3 Note: It may be necessary to switch coarse zero up or down one position. Minimum Span E2 6. Adjust the coarse zero rotary switch to obtain an output of aproximately 4mA or 10mA. Adjust the fine zero for exact calibration. Input Limits E1 5. Set the calibrator to the desired minimum. 7. Set the calibrator to the desired maximum and perform similar adjustments using the coarse span switch and fine span potentiometer. 5 400 3. Select the input range from Table 1 or 2 and configure switches S1 through S5. 4. Connect the input to a calibrated thermocouple source. Connect the output loop to a voltage supply and monitor the output current. Refer to Terminal Wiring. 4 200 0 to 1000 K4 Key: 3 350 K2 2. Select the output range using switch S6. The CLOSED position selects a 10-50mA output. The OPEN position selects a 420mA output. 2 300 J3 1 0 to 1760 450 0 to 3200 750 1 2 3 4 5 = 1 = ON or Closed Field Mounting The T723 is designed for installation in industrial field environments. A sealed, diecast aluminum housing protects against corrosion, moisture, dust and electrical noise such as radio frequency (RFI) and electromagnetic (EMI) interference. All circuit boards are urethane coated for environmental protection and FM approval. Top View Diagram Span Adjustment Zero Adjustment For protection against extreme moisture, hosedirected water (NEMA 4) or hazardous environments, use model F723. The F723 2-wire transmitter offers the same wide-ranging features of the T723, but includes a rugged Explosion Proof (EP) NEMA 4 enclosure with standard, 1/2" and 3/4" FPT ports for operation in harsh process environments. Mounting Hardware Dimensions in millimeters (inches) T805 Field Mountable Housing (EP, NEMA 4 rated) 3/4" Hub (Includes T903 Retainer Ring & NEMA 4 Gasket) T723 Terminal Connections 1. 2. 3. 4. 5. 6. Loop Output (-) Loop Output (+) No Connection Input (+) Input (-) Shield (Gnd) Note 1: For best RF & common mode rejection, ground the case (pin 6). Note 2: RL represents any other device loads in the current loop. Specifications Loop Voltage Drop 12VDC 12VDC @ 20mA Stability Zero: ±0.02% of span/°C, max. Span: ±0.01% of span/°C, max. Overall Accuracy (Includes Linearity, Hysteresis, Stability) ±0.5% of any adjusted span, max. Zero and Span Adjustability 80% of any selected range Repeatability ±0.05% of span, typical Cold-Junction Error (Ambient) J/K/T/E Inputs 0 to 80°C: 1°C, typical -40 to 0°C: 3°C, typical R/S Inputs 0 to 80°C: 2°C, typical -40 to 0°C: 5°C, typical Models & Accessories Dimensions Ordering Information Dimensions in millimeters (inches) Input Span Range (Max/Min) See Tables 1 and 2 Leadwire Resistance Effect