1919P03 1919P01 QBM65 QBM75-1U/C QBM75 QBM65-1/C QBM65-3/C QBM65-10/C - Datasheet Archive

 

1919P03 1919P01 919 QBM65./C, QBM75-1U/C QBM75.1-1/C QBM65./C QBM75./C Differential Pressure Sensors for air and non-corrosive

 

1 1919P03 1919P03 1919P01 1919P01 919 QBM65 QBM65./C, QBM75-1U/C QBM75-1U/C QBM75 QBM75.1-1/C QBM65 QBM65./C QBM75 QBM75./C Differential Pressure Sensors for air and non-corrosive gases, with calibration certificate · Highly accurate measurements with calibration certificate · Simple and quick to install · Recalibration service . . . . . . . . . . . . . . . . . . . Use The calibrated differential pressure sensors are used in circumstances where highly accurate measurements are required, or where there is a (statutory) requirement for regular calibration. Typical applications include the measurement of positive or negative pressure and pressure differentials in HVAC plants, including the control of duct pressure differentials for fan control, room pressure equalization in VAV systems, and filter and fan-belt monitoring. Other possible uses include the monitoring of specified pressure differentials in production areas and laboratories in the chemical industry, and in hospitals, clean-rooms, warehouses, restaurants, kitchens, etc. Type summary Type reference QBM75-1U/C QBM75-1U/C QBM75 QBM75.1-1/C QBM65-1/C QBM65-1/C QBM65-3/C QBM65-3/C QBM65-10/C QBM65-10/C QBM65-25/C QBM65-25/C Measuring range ­ 50 . + 50 Pa 0 . 100 Pa 0 . 100 Pa 0 . 300 Pa 0 .1,000 Pa 0 .2,500 Pa Max. positive pressure 5,000 Pa 5,000 Pa 5,000 Pa 5,000 Pa 10,000 Pa 20,000 Pa Output signal DC 4 . 20 mA DC 4 . 20 mA DC 0 . 10 V DC 0 . 10 V DC 0 . 10 V DC 0 . 10 V LCD display No Yes No No No No (Conversion: 100 Pa = 1 hPa = 1 mbar) CA1N1919E CA1N1919E 09.01.2003 Siemens Building Technologies HVAC Products . . . . . . . Accessories Name Type reference /part no. 2 m plastic tubing, 5 / 8 mm dia. No 3-core connector (round, Lumberg RKC 30/11) No Mounting bracket (required when mounting the sensor on lagged ducts) AQB21 AQB21.2 Included in standard delivery AQB21 AQB21.1 Bracket for top hat rail (5 pieces) for top hat rails to DIN, HT 35-7.5 Remark Air duct probe, short (for simple, quick and airtight mounting) FK-PZ1 Air duct probe, long (with orifice plate for precise measurements) FK-PZ2 Not included in standard delivery Not included in standard delivery (see data sheet N1589 N1589) Ordering and delivery When ordering, please give name and type reference, e.g. Differential pressure sensor QBM65-3/C QBM65-3/C The differential pressure sensors are supplied with a round connector (type: Lumberg RKC 30/11). If needed, the AQB21 AQB21.1 mounting bracket, the AQB21 AQB21.2 bracket for top hat rail and FKPZ1 or FK-PZ2 duct probes must be ordered as separate items. The type FK-PZ. duct probes are supplied in packs of two and the AQB21 AQB21.2 bracket for top hat rail in packs of five. Equipment combinations The QBM65 QBM65./C differential pressure sensor can be used in combination with all devices or systems capable of handling its DC 0.10 V output signal. Type QBM75 QBM75./C can be used with all devices or systems capable of handling its DC 4.20 mA output signal and having a power supply in the range of DC 11.33 V (2-wire connection). Mode of operation The differential pressure sensors use a silicone-rubber diaphragm to register changes in pressure. The deflection of the diaphragm is registered by the ceramic lever and converted into an electrical signal. This signal is conditioned by the built-in electronic circuit to give a linear DC 0.10 V, or DC 4.20 mA signal representing the measured value. Mechanical design The differential pressure sensors comprise the following: · Sensor housing with integral 3-core connector and hinged cover · Pressure casing with diaphragm and lever · Printed circuit board · Digital display for sensor signal in Pa (only with the QBM75 QBM75.1-1/C) Mounting and installation notes Mounting instructions are enclosed with the differential pressure sensors. The differential pressure sensors are suitable for direct mounting on ducts, walls or ceilings and in control panels. Note that the sensors must be mounted vertically. 2/6 Siemens Building Technologies HVAC Products CA1N1919E CA1N1919E 09.01.2003 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Where possible, the pressure connection nozzles should be at the bottom, or if necessary, to the side, and they should always be higher than the duct probes. Horizontal mounting (with the hinged cover at the top or bottom) is NOT RECOMMENDED. If horizontal mounting cannot be avoided, account must be taken of deviations in the measured value (see "Factory calibration" below). 70006 + ­ Caution : If the pressure connection nozzles face upwards, or are at a lower level than the duct probes, condensation can collect inside the unit, causing damage to the sensor. For direct mounting on lagged ducts, the sensor can be fitted with an AQB21 AQB21.1 mounting bracket (see "Accessories"). A 2 m length of plastic tubing is supplied with the sensor and can be adapted to the duct probes on site. Connect the tubing from the lower pressure side to pressure connection nozzle 'P2' or ' ­ '. Factory calibration The values given under "Technical data" are valid only when the differential pressure sensor is mounted vertically. Should it be necessary to mount the sensor horizontally, i.e. with the hinged cover at the top or bottom (NOT RECOMMENDED), account must be taken of the following deviations in the measured value: Signal: As per factory calibration NOT RECOMMENDED: Hinged cover facing downwards. NOT RECOMMENDED: Hinged cover facing upwards. Signal QBM65 QBM65./C and QBM75 QBM75.1-1/C: approx. 10 Pa above actual pressure. Signal QBM65 QBM65./C and QBM75 QBM75.1-1/C: approx. 10 Pa below actual pressure. Signal QBM75 QBM75./C: approx. 14 Pa above actual pressure. Recommended orientation: Hinged cover in vertical position. Signal QBM75 QBM75./C: approx. 14 Pa below actual pressure. 70007 ­ + + ­ + ­ Recalibration service Siemens Building Technologies provides a recalibration service for these pressure sensors. Under `normal' conditions, recalibration should be repeated at 12-month intervals (or in accordance with the relevant statutory requirements). A recalibrated sensor should not be stored for more than 12 months (or it should be commissioned within that period). In the case of sensors which are over 10 years old and/or in poor condition, Landis & Staefa reserves the right to refuse recalibration and readjustment. Services included The recalibration service 1) comprises the following elements: · Calibration 2) with record of values · Sensor test including repairs and replacement of worn parts. Repair of the measuring element where necessary · If necessary, readjustment 3) and recalibration · Completion and supply of a new calibration certificate Despatch and registration (original sensor returned to the customer) 1) 2) 3) Handling and invoicing reference S/QBM65 S/QBM65./C or S/QBM75 S/QBM75./C The sensor is compared with a measuring standard. Deviations are recorded but not corrected The sensor is compared with a measuring standard and any deviations noted are corrected 3/6 Siemens Building Technologies HVAC Products CA1N1919E CA1N1919E 09.01.2003 . . . . . . Technical data Electrical interface Power supply Safety extra low voltage (SELV, PELV) QBM65 QBM65./C Supply voltage Max. voltage tolerance Power consumption Current draw Output signal QBM75 QBM75./C Supply voltage Power consumption Current draw Output signal AC 24 V, 50/60 Hz or DC 13.5.33 V ±15 % at AC 24 V < 0.5 VA < 15 mA DC 0.10 V, RLoad > 10 k (not galvanically separated, 3-wire connection, short-circuit-proof, reversed polarity protection) DC 11.33 V < 0.7 VA 4.20 mA 4.20 mA, RLoad > . . . . . . Operation voltage - 11 V 0.02 A (2-wire connection, short-circuit-proof, reverse polarity protection) Product data Measuring range Measuring element QBM65-3/C QBM65-3/C QBM65-10/C QBM65-10/C QBM65-25/C QBM65-25/C QBM65-1/C QBM65-1/C QBM75 QBM75.1-1/C QBM75-1U/C QBM75-1U/C Conditions Measuring accuracy in correct mounting position and at a room temperature of between 20 . 25 °C (FS = Full Scale): General: Zero point voltage Zero point current Zero point Total, linearity and hysteresis TC zero point TC sensitivity Zero point Total, linearity and hysteresis TC zero point TC sensitivity Total, zero point, linearity and hysteresis TC zero point TC sensitivity Response time 90 % Nominal pressure Max. positive pressure Bursting pressure Suitable media Admissible temperature of medium Maintenance Electrical connection Pressure connections See "Type summary" Piezoresistive (silicone-rubber diaphragm and ceramic lever) < 50 mV < 0.1 mA < ± 0.7 % FS < ± 1 % FS < ± 0.04 % FS/°C < ± 0.02 % FS/°C < ± 1 % FS < ± 2 % FS < ± 0.10 % FS/°C < ± 0.05 % FS/°C < ± 3 % FS < ± 0.10 % FS/°C typical < ± 0.05 % FS/°C typical