Differential pressure sensors

Transcription

1 P P03 QBM65-..., QBM QBM Differential ressure sensors for air and nonaggressive gases QBM65... With choice of ressure-linear or extracting-the-root characteristic with adjustable ressure measuring range Oerating voltage AC 24 V or DC V Outut signal DC V Use For very demanding requirements with regard to accuracy and quality in the field of ventilation, air conditioning and heating. To acquire the differential ressure of air or nonaggressive gases. Tyical fields of alication: Chemical industry (laboratories and roduction) In industrial environments (risk of contamination) In hositals (e.g. in the oerating theatre) The differential ressure detectors are used: To measure over- or underressure in air ducts in relation to the ambient resure To measure ressure differentials between different rooms To acquire variable air volumes in VAV lants on the suly and extract air side To monitor filters and to control fans Esecially on alications that demand: great accuracy very short resonse times (monitoring of fans) nonsuscetibility to contamination CA1N1916E Siemens Building Technologies HVAC Products

2 Tye summary Pressure-linear characteristic, without indication Tye Measuring range Overload range reference Standard Limit value (adjustable) QBM65-1U Pa No 5,000 Pa QBM Pa No 5,000 Pa QBM Pa No 5,000 Pa QBM Pa No 10,000 Pa QBM ,000 Pa No 10,000 Pa QBM ,500 Pa No 20,000 Pa Pressure-linear characteristic, with indication Tye Measuring range Overload range reference Standard Limit value (adjustable) QBM Pa No 5,000 Pa QBM Pa No 5,000 Pa QBM Pa No 10,000 Pa QBM ) 0...1,000 Pa No 10,000 Pa QBM ) 0...2,500 Pa No 20,000 Pa 1) Value dislayed x 10 = measured value Extracting-the-root characteristic, without indication Tye Measuring range Overload range reference Standard Limit value (adjustable) QBM Pa Pa 5,000 Pa QBM Pa Pa 5,000 Pa QBM Pa Pa 10,000 Pa QBM Pa ,000 Pa 10,000 Pa QBM Pa 1, ,500 Pa 20,000 Pa (Conversion: 100 Pa = 1 hpa = 1 mbar) Accessories (not included in standard delivery) Name Tye reference/art no. Data sheet no. Duct robes, short FK-PZ Duct robes, long FK-PZ Mounting bracket AQB21.1 Ordering and delivery When ordering, lease give name and tye reference, e.g. differential ressure sensor QBM The differential ressure sensor is sulied comlete with 2 m lastic tubing. Accessories are to be ordered searately, with name and tye reference or order number. The duct robes are sulied only in airs. Equiment combinations Any systems or devices that are caable of acquiring and handling the sensor s DC V outut signal. 2/8

3 Mode of oeration The sensor acquires the differential ressure with the hel of a silicon diahragm. The deflection of the diahragm is sensed and converted to an electric signal. With the extracting-the-root sensors, the otentiometer is used to match the ressure measuring range on an individual basis. Deending on the tye of sensor, the sensor s electronic circuit generates either a ressure-linear or extracting-the-root signal which is calibrated and temeraturecomensated. The measured value is delivered by the sensor as an analog DC V outut signal. Overview of the characteristics and measuring accuracy at an ambient temerature of 20 C: Sensor characteristics and accuracy Linearer outut and total tolerances with a change of ±10 C U A [V] 10,00 9,00 8,00 7,00 6,00 5,00 4,00 3,00 2,00 1,00 0, D01 Sensor characteristic Tolerance with QBM65-1U Tolerance with QBM65-1 Tolerance with QBM Tolerance with other linear tyes [%] Extracting-the-root outut and total tolerances with a change of ±10 C U A [V] 10,00 9,00 8,00 7, D02 6,00 5,00 4,00 3,00 2,00 Sensor characteristic Tolerance with QBM Tolerance with other extracting-the-root tyes 1,00 0, [%] Legend U A Outut voltage in V Pressure measuring range in ercent For detailed information on accuracy, refer to "Technical data". 3/8

4 Mechanical design The differential ressure sensor is designed for wall and ceiling mounting. It consists of: Sensor housing with mounting bracket, cable entry and removable sna-on cover with safety screw Pressure casing with diahragm and lever Printed circuit board with connection terminals and with the extracting-the-root sensor with a otentiometer for adjusting the limit value LCD with the QBM Dislay, setting and connection elements 1916Z Legend 1 Cable entry gland Pg 11 with cable strain relief 2 Digital dislay for sensor signal in Pa (only with the QBM ) 3 Potentiometer, to set the measuring range (only with the QBM ); sulied in the fully clockwise osition (100 % signal) 4 Terminal block 5 Safety screw for hinged cover 6 Nile for tubing connection "+" 7 Nile for tubing connection " " Engineering notes The transformer used must be suited for safety extra-low voltage. It must have searate windings and be designed for 100 % duty. It must be sized and fused in comliance with local safety regulations. If the line length exceeds 50 m and runs arallel to mains cables, screened cable must be used! Mounting and installation notes The QBM65... is suitable for direct mounting on ducts, walls or ceilings and in control anels. The sensor should be mounted vertically. Where ossible, the ressure connection niles should be at the bottom, or if necessary, to the side, and they should always be higher than the duct robes. Horizontal mounting (with the hinged cover to the to or bottom) is NOT RECOMMENDED. If horizontal mounting cannot be avoided, account must be taken of deviations in the measured value (refer to "Factory calibration", below). 4/8

5 + 1916Z02 Caution: If the ressure connection niles face uward or are at a lower level than the duct robes, condensation can collect inside the unit, causing damage to the sensor. When mounting on insulated air ducts, mounting bracket AQB21.1 is required. Sna-on connection between sensor and bracket. A 2 m length of lastic tubing is sulied with the sensor and can be adated to the duct robes on site. The tubing with the higher ressure (lower vacuum) must be connected to nile "P1" or "+", and the tubing with the lower ressure (higher vacuum) must be connected to nile "P2 or " ". The sensor is sulied with mounting instructions. Factory calibration The values given under "Technical data" are valid only when the differential ressure sensor is mounted vertically. Should it be necessary to mount the sensor horizontally, i.e. with the hinged cover at the to or bottom (NOT RECOMMENDED), account must be taken of the deviations in the measured value. Recommended orientation: hinged cover in vertical osition. Signal: as er factory calibration (mandatory with the QBM65-1U) NOT RECOMMENDED: Hinged cover facing downward. Signal: aroximately 10 Pa above actual ressure NOT RECOMMENDED: Hinged cover facing uward. Signal: aroximately 10 Pa below actual ressure 1916Z /8

6 Technical data Power suly Signal outut Oerating voltage Safety extra-low voltage SELV or Protection extra-low voltage PELV Frequence Power consumtion Current consumtion Outut voltage Load (R Last ) Outut AC 24 V ±15 % or DC V HD384 50/ 60 Hz <0.5 VA <10 ma DC V >10 kω not galvanically searated, 3-wire connection, short-circuit roof and rotected against reversed olarity) Functional data Measuring range Measuring element refer to "Tye summary" iezoresistive (Silicone diahragm and ceramic lever) Measuring accuracy when mounted in recommended orientation and at an ambient temerature of 20 C (FS = Full Scale) With linear characteristic Zero oint <±0.7 % FS Total linearity and hysteresis <±1 % FS TC zero oint <±0.04 % FS/ C <±0.02 % FS/ C For QBM65-1 and QBM Zero oint <±1 % FS Total linearity and hysteresis <±2 % FS TC zero oint <±0.10 % FS/ C <±0.05 % FS/ C For QBM65-1U Total zero oint, linearity, reroducibility <±3 % 3 Pa (3 % FS) and hysteresis TC zero oint <±0.10 % FS/ C tyical <±0.05 % FS/ C tyical With extracting-the-root characteristic Absolute error ( % of ressure range) TC zero oint ( % of ressure range) For QBM Absolute error ( % of ressure range) TC zero oint ( % of ressure range) Resonse time Pressure ranges Max. erm. ressure Bursting ressure Dislay (only with QBM ) Range Media ±0.3 <±0.06 FS +1.5 [% of final value] FS <±0.02 % FS/ C ±0.6 <±0.15 in % FS/ C FS +1.5 [% of final value] FS in % FS/ C <±0.05 % FS/ C <10 ms refer to "Tye summary" refer to "Tye summary" 500 hpa/500 mbar liquid crystal standard ressure measuring range in Pa, 3.5 Digit air and nonaggresive gases Perm. temerature of medium C Maintenance no maintenance required 6/8

7 Connection Protective data Environmental conditions Connection terminals screw terminals for mm 2 Cable entry Pg 11 cable gland Pressure connection lastic nozzle 6.2 mm dia. Degree of rotection IP 54 to IEC 529 Safety class III to EN Perm. ambient temerature Oeration C Storage/transort C Perm. ambient humidity <90 % r.h., noncondensing Standards Product standards Automatic electric controls for houshold and similar use EN Electromagnetic comatibility Emmissions to EN Immunity to EN conformity to EMV directive 89/336/EEC conformity to Arobation Fire safety Australian EMC Framework Radio Communication Act 1992 Radio Interference Emmission Standard AS/NZS 3548 UL standard UL First Edition CSA standard CSA C22.2 No Fire class to UL94 Hinged cover HB Pressure casing, comlete V-2 Tubing V-2 Materials Weight Housing Hinged cover Pressure casing Diahragm Tubing Weight (including ackaging), without indication Weight (including ackaging), with indication PC (Polycarbonate) ABS PC with 10 % fibre-glass 2-comonent silicone LSR and PC with 10 % fibreglass, free from gas emissions PVC (Polyvinylchloride, soft) 0.09 kg 0.10 kg 7/8

8 P2P2 For latest rices and delivery to your door visit MyTub Ltd info@mytub.co.uk Connection terminals (0) ( ) (+) M U G 1916G01 G (+) M (0) U ( ) Oerating voltage AC 24 V or DC V GND, measuring neutral Measuring signal DC V Dimensions (all dimensions in mm) , ,5 80 9,6 16,3 1916M01 9 ø 6, P1 18 P2 8/ Siemens Building Technologies Ltd.