Low Pressure Transducer Model PR-274/275

Transcription

1 Low Pressure Transducer Model PR-274/ % solid state, micro-machined, glass-on-silicon, ultra-stable capacitance sensor As low as ± 0.05"wc (± 12.5 pa) Can resolve less than "wc ( pa) Up to 10 PSID overpressure without zero shift Up to 6 field selectable ranges in one unit Wide VDC/12-35 VAC unregulated supply voltage Two temperature compensated output versions, 4-20 ma 2-wire or field selectable 0-5 VDC/0-10 VDC Non-interacting zero and span trimmers NIST traceable calibration Two rugged steel enclosure types NEMA 4 (IP-65) or panel mount for ease of installation Short circuit and reverse polarity protected Conforms to EMC standards EN / EN55014/EN The PR-274/275 incorporates a new micro-machined glass-on-silicon (Gl-Si) capacitance sensor. This technology revolutionizes very low pressure measurement. Temperature related zero drift, calibration shift due to overpressure, non-repeatability, non-linearity, and extremely low pressure sensitivity have been some of the problems which have plagued the controls industry. The PR-274/275 with the new Gl-Si technology not only addresses all of the above shortcomings, but for the first time offers a reliable, accurate means to measure and control building/room pressure, air flow, duct pressure, filter pressure drop, or any other extremely low pressure application. Up to six field selectable direct or compound ranges, two enclosure types, field selectable outputs, fully temperature compensated NIST traceable accuracy, non-interacting zero and span adjustments, short circuit and reverse polarity protected output, and a liberal two year warranty are some of the features which make the PR-274/275 the industry' s highest performance, ultra-stable, low pressure transducer Flying Cloud Drive Minneapolis, MN USA 800/ / FAX 612/ sales@mamacsys.com Units 6&7 Baird House Dudley Innovation Centre 4 Armiger Court, Unit McIntosh Drive, Unit 5 Markham 5611 North Bridge Road Pensnett Estate Kingswinford Holden Hill S. A Australia Ontario L3R 0N6 Canada Eng Cheong Tower West Midlands DY6 8XZ United Kingdom Fax Fax Singapore Fax Fax Registered Trademark MAMAC SYSTEMS, Inc.

2 PR-274/275 The PR-274/275 incorporates sophisticated integrated circuits to not only provide a high level, fully conditioned and temperature compensated output, but also to offer field selectable flexibility which was unheard of in the industry. The PR-274/275 offers up to six field selectable pressure ranges in one unit. In this way, a customer does not need to know the exact pressure range prior to selection. By merely knowing the application, a unit may be selected and then later field configured for the desired pressure range. With fixed range units, in case of engineering error or incorrect selection, the only solution is expensive field recalibration or time consuming product exchange or replacement. Similarly, numerous units have to be kept in stock as spares to cover all ranges in case of field failure. The PR-274/275 with the field selectable pressure ranges in a particular application thereby eliminating the need to stock numerous fixed range units. (For a complete listing of all the ranges available, please see the ordering information section on page three.) On VDC output units, two additional field selectable options are available: dual outputs 0-5 or 0-10 VDC, and dual unregulated supply voltages VAC or VDC. By merely moving a shorting plug, one can select the desired output for the specific application. As far as supply voltage is concerned, the unit automatically configures for AC or DC and no field selection is necessary. Another feature is that the output is fully protected from short circuit to ground, or if the supply voltage is applied by mistake to the output. Past experience demonstrates that field related wiring problems do occur. Instead of denying this fact, the protection circuit is designed in to ensure trouble-free start-up. The VDC output unit is also designed to handle low impedance circuits. In fact, the unit can drive up to 1k ohms minimum. In this way, multiple controllers, indicators, or other devices can be paralleled to the output without performance degradation. The ma output units can function over a wide unregulated supply voltage range: VDC without any effect on calibration or performance. The unit has reverse polarity protection built in. As a result, it is next to impossible to damage the unit by mis-wiring. By using sophisticated low drop-out voltage regulators and CMOS integrated circuits, the ma output unit can drive very high output impedance. In fact, with only 12 VDC supply, the unit can drive 200 ohms. At 40 VDC, the unit is capable of handling up to 1600 ohms load. In this way, the output loop can be tied in series to multiple controllers, indicators, and other devices without degrading the performance. Automated NIST traceable pressure controllers and precision Barocel pressure sensors are utilized to calibrate and certify the PR-274/275 transducers. Calibration data on each unit is archived digitally for SPC and QC purposes. All automated calibration systems are networked and data is available on-line to numerous individuals at the same time. In this way, extremely high standards of quality and calibration integrity are maintained. Each unit is individually temperature compensated in an environmental chamber. The temperature compensation data is also digitized and archived for future reference purposes. Compensating each unit individually ensures that published specifications are adhered to. Due to low mass of the micro-machined capacitance Gl-Si sensor, the mounting orientation error for ranges higher than 1.0"wc (250 pa) is negligible. For extremely low ranges, if the unit is installed as indicated on the label, there should be no orientation error. However, due to space limitation, if the unit cannot be installed in the indicted position, the error can be easily removed by merely adjusting the zero trimmer. Since the zero and span trimmers are non-interactive, adjustment to the zero should under no circumstance affect the calibration integrity of the unit including linearity and repeatability specifications across the range. The PR-274/275 is available with two packaging options: a NEMA 4 (IP-65) fully gasketed, dust proof and splash proof enclosure, or a lightweight but rugged panel mount chassis for ease of installation with minimum space requirement in a control panel. The NEMA 4 (IP-65) enclosure has an external mounting bracket to facilitate field installation. A 1/2" (.875"/22.25mm dia.) knock-out for conduit connection is also provided. A liquid tight cable connector is also supplied if the unit is not being hard wired. Once installed, the enclosure maintains its environmental rating and protects the electronics and the sensing element from condensation, corrosive contaminants and other environmental pollutants. Both packaging options also have additional features for ease of installation, including unpluggable terminal blocks, rugged brass hose barbs, easily accessible zero and span trimmers, and conveniently located shorting plugs for field selection.

3 Specifications: Accuracy*: ± 1% FS Overpressure: 10 PSID PR-274/275 Compensated Temp Range: 25 F-150 F (-4 C-65 C) T. C. Error: ±0.0125%/ F (.02%/ C) Supply Voltage: VDC VAC (VDC output units only) Supply Current: VDC Units - 10 ma max. ma Units - 20 ma max. Enclosure: 18 Ga C. R. Steel NEMA 4 (IP-65) or Panel Mount Chassis Finish: Baked on enamel-pms2gr88b Operating Temp Range: 0 F-175 F (-18 C-80 C) Media Compatibility: Clean dry air or any inert gas Environmental:10-90%RH Non-Condensing Termination: Unpluggable screw terminal block Wire Size: 12 Ga max. Load Impedance: 1.6K ohms max. at 40 VDC (ma output units) 1K ohms min. (VDC output units) Weight: Enclosure 1.0 lbs. (.45 kg), Panel Mount: 0.5lbs. (.25 kg) *Includes non-linearity, hysteresis and non-repeatability Ordering Information: PR- PACKAGING RANGE OUTPUT 274 (enclosure) Rl ("wc) 0 T O / TO ma (4-20 ma 2 wire) 275 (panel mount) R2 ("wc) 0 TO 1.0 / 0 TO 0.5 / 0 TO 0.25/ VDC (0-5 VDC or 0-10 VDC -0.5 TO / TO / field selectable) TO R3 ("wc) 0 TO 5.0 / 0 T O 2.5 / 0 TO 1.25/ -2.5 TO +2.5 / TO / TO R4 ("wc) 0 T O 30 / 0 TO 15 / 0 TO 7.5/ TO / -7.5 TO +7.5/ TO R5*(pa) 0 TO 25 / TO R6*(pa) 0 TO 250 / 0 TO 125 / 0 TO 62.5/ -125 TO / TO / TO R7*(pa) 0 TO 1250 / 0 TO 625 / 0 TO 312.5/ -625 TO / TO / TO R8*(pa) 0 TO 7500 / 0 TO 3750 / 0 TO 1875/ TO / TO / T O Example: PR-274-R2-mA: Enclosure unit with R2 Range which has six (6) field selectable range options and 4-20 ma output.

4 PR-274/ " (127.5) 1.56" (39.78) 2.125" (54.19) 2.20" (56.1) 4.50" (114.75) 5.50" (140.25) 1.125" (28.69) 1.125" (28.69) 2.25" (57.38) 3.250" (82.88) 2.658" (67.78) 4.00" (102) 5.00" (127.5) 2.75" (70.12) 2.75" (70.12) Panel Mount (mm) Enclosure WARRANTY: MAMAC Systems, Inc. warrants its products to be free of defects in material and workmanship for a period of two (2) years from date of shipment. If a unit is malfunctioning, it must be returned to the factory for evaluation. A return authorization number (RMA) will be issued by the customer service department and this number must be written or prominently displayed on the shipping boxes and all related documents. The defective part should be shipped freight pre-paid to the factory. Upon examination by MAMAC Systems, Inc., if the unit is found to be defective, it will be repaired or replaced at no charge to the customer. However, this warranty is void if the unit shows evidence of being tampered with, damaged during installation, misapplied, misused, or used in any other operating condition outside of the unit' s published specifications. MAMAC Systems, Inc. makes no other warranties or representations of any kind whatsoever, expressed or implied, except that of title. All implied warranties including any warranty of merchantability and fitness for a particular purpose are hereby disclaimed. User is responsible to determine suitability for intended use. LIMITATIONS OF LIABILITY: The remedies of buyer set forth herein are exclusive and the total liability of MAMAC Systems, Inc. with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the product upon which liability is based. In no event shall MAMAC Systems, Inc. be liable for consequential, incidental or special damages. MAMAC Systems, Inc. reserves the right to change any specifications without notice to improve performance, reliability, or function of our products. Every precaution for accuracy has been taken in the preparation of this manual, however, MAMAC Systems, Inc. neither assumes responsibility for any omissions or errors that may appear nor assumes liability for any damages that result from the use of the product in accordance with the information contained in the manual Flying Cloud Drive Minneapolis, MN USA 800/ / Fa x 612/ sales@mamacsys.com Units 6&7 Baird House Dudley Innovation Centre 4 Armiger Court, Unit McIntosh Drive, Unit 5 Markham 5611 North Bridge Road Pensnett Estate Kingswinford Holden Hill S. A Australia Ontario L3R 0N6 Canada Eng Cheong Tower West Midlands DY6 8XZ United Kingdom Fax Fax Singapore Fax Fax Registered Trademark MAMAC SYSTEMS, Inc.

5 Model PR-274/ Flying Cloud Drive Minneapolis, MN USA Fax For additional information, see the accompanying data sheet for this transducer. Ordering Information PACKAGING RANGE OUTPUT 274 (enclosure mount) R1 ( wc) 0.10 / to 0.05 ma 4-20 ma two-wire 275 (panel mount) Dimensions R2 ( wc) R3 ( wc) R4 ( wc) R5 (pa) R6 (pa) R7 (pa) R8 (pa) 1.0 / 0.5 / 0.25 / -0.5 to 0.5 / to 0.25 / to / 2.5 / 1.25 / -2.5 to 2.5 / to 1.25 / to / 15 / 7.5/ / -7.5 to 7.5 / to / to / 125 / 62.5 / -125 to 125 / to 62.5 / to / 625 / / -625 to 625 / to / to / 3750 / 1875 / / to 1875 / to VDC 0-5 or 0-10 VDC (field selectable) Low Pressure Transducer Technical Information Rev. 0 Make all connections in accordance with the job wiring diagram and national and local electrical codes. Use only copper conductors. Use electrostatic discharge precautions such as wrist straps when installing and wiring the transducer. Avoid installing the transducer in locations where severe shock, vibration, excessive moisture, or corrosive fumes are present. NEMA 4 housings are primarily intended for outdoor use to provide a degree of protection against windblown dust, rain, and hosedirected water. Do not exceed ratings for the transducer. Mounting 1. Remove the transducer cover using a Phillips screwdriver. 2. Select the mounting location. 3. Mount the transducer on a vertical surface with two number eight self-tapping screws (not provided). 4. Pull the wires through the bottom of the enclosure and make the necessary connections. 5. Replace the cover and make the pneumatic connections. Wiring Use 12 AWG wire maximum for wiring terminals. Use flexible 1/4-inch outer diameter (5/32-inch inner diameter) tubing for the high and low pressure connections. See Figures 6 to 9 for wiring diagrams and Figures 10 and 11 for jumper designations. Wiring for ma Output 1. Remove the blue terminal block by carefully pulling it off the circuit board. See Figure Locate the [+] and [-] terminal markings on the board. 3. Attach the supply voltage to the [+] lead. 4. Connect the 4-20 ma output ([-] terminal) to the controller s input terminal. 5. Ensure that the power supply common is attached to the common bus of the controller. 6. Reinsert the terminal block to the circuit board and apply power to the transducer. 7. Check for the appropriate output signal by using a DVM set to DC milliamps connected in series to the [-] terminal. Figure 1. Pressure Transducer Dimensions Specifications Accuracy*: ± 1% FS Overpressure: 10 PSID Supply Voltage: VDC; VAC (VDC output transducers only) Supply Current: 10 ma maximum for VDC output transducers; 20 ma maximum for ma output transducers Enclosure: 18 gage C.R. steel NEMA 4 (IP65) or panel mount chassis Finish: Baked-on enamel PMS2GR88B Compensated Temperature Range: 25 F to 150 F (-4 C to 65 C) T. C. Error: ± %/ F (.02%/ C) Operating Temperature Range: 0 F to 175 F (-18 C to 80 C) Media Compatibility: Clean dry air or any inert gas Environmental: 1 90% RH non-condensing Termination: Unpluggable screw terminal block Wire Size: 12 gage maximum Load Impedance: 1.6K ohms maximum at 40 VDC (ma output transducers) 1K ohms minimum (VDC output transducers) Weight: Enclosure mount: 1.0 lb. (.45 kg); Panel mount: 0.5lbs. (.25 kg) * Includes nonlinearity and non-repeatability. Figure 2. Enclosure Mount Transducer Figure 3. Panel Mount Transducer Figure 4. Pressure Transducer With ma Output Wiring for VDC Output The VDC output low pressure transducer is field selectable for 0-5 VDC or 0-10 VDC output and can be powered with either VDC or VAC. 1. Remove the blue terminal block by carefully pulling it off the circuit board. See Figure Locate the [+], [-], and [0] terminal markings on the board. 3. Attach the power wires to the [+] and [-] terminals. The [-] terminal is also the negative output terminal. 4. Connect the [0] terminal, which is the positive VDC output terminal, to the controller s input. 5. Reinsert the terminal block to the circuit board and apply power to the transducer. 6. Check the appropriate VDC output by using a DVM set to DC volts connected to the [0] and [-] terminals. CAUTION! If using grounded AC, ensure that the hot wire is on the [+] terminal. In addition, if using a controller without built-in isolation, use an isolation transformer to supply the transducer. This transducer contains a half-wave rectifier power supply and must not be powered from transformers powering other devices with non-isolated full-wave rectifier power supplies. When multiple transducers are powered from the same transformer, damage will result unless all 24-gage power leads are connected to the same power lead on all transducers. Maintain the correct phasing when powering more than one transducer from a single transformer. Installation Inspection Inspect the transducer packaging for signs of damage. If damaged, notify the carrier immediately. Requirements Tools (not provided): - Digital volt-ohm meter (DVM) - Appropriate screwdriver for mounting screws - Appropriate drill and drill bit for mounting screws Appropriate accessories Two #8 self-tapping mounting screws (not provided) Training: Installer must be a qualified and experienced technician WARNING! Figure 5. Pressure Transducer With VDC Output Disconnect the power supply before installing the transducer. Failure to do so can result in electrical shock and equipment damage. IS.PR274/275-00

6 Typical Applications (wiring diagrams) Figures 6 and 7 illustrate typical wiring diagrams for the ma output low pressure transducer. Figure 6. Wiring ma Output Transducers With an External DC Power Supply Figure 10. Jumper Selections for Pressure Transducers With ma Output Figure 7. Wiring ma Output Transducers Where the Controller or Meter Has an Internal DC Power Supply Figures 8 and 9 illustrate typical wiring diagrams for the VDC output low pressure transducer. Figure 8. Wiring VDC Output Transducers With an External AC Power Supply Figure 11. Jumper Selections for Pressure Transducers With VDC Output Checkout 1. Verify that the transducer is mounted in the correct position. 2. Verify the appropriate input signal and supply voltage. 3. Verify the appropriate configuration range. CAUTION! Adjustments Figure 9. Wiring VDC Output Transducers With an External DC Power Supply Jumper Configuration Jumper configuration varies according to the output type of the low pressure transducer. Range configurations are shown in Table 1. Jumper selections for ma output low pressure transducers are shown in Figure 10; jumper selections for VDC output low pressure transducers are shown in Figure 11. Table 1. Jumper Range Configurations Range A B C D F E G H R1 R2 R3 R to to to to to to to to to 3.75 Never connect 120 VAC to the pressure transducer. AC voltage should never be connected to a transducer intended for a DC power supply. Transducer Operation 1. Adjust the pressure to obtain the maximum output signal for the appropriate range. 2. Ensure that output is either 20 ma or 5 or 10 VDC. 3. Adjust the pressure to obtain a minimum output signal. 4. Ensure that output is either 4 ma or 0 VDC. Note: This pressure transducer is a highly accurate device. For applications requiring a high degree of accuracy, use laboratory quality meters and gages. Calibration All transducers are factory calibrated to meet or exceed published specifications. If field adjustment is necessary, follow these instructions: Calibration of All Pressure Transducers 1. Connect terminals [+] and [-] to the appropriate power source. 2. Connect the DVM in series to the [-] terminal. 3. Apply low pressure to the transducer and carefully adjust the zero trimmer [Z] to obtain the desired low output pressure. 4. Apply high pressure to the transducer and adjust the span trimmer [S] to obtain the desired high output pressure. 5. Repeat steps 3 and 4 until the transducer is fully calibrated. R5 R6 R7 R to to to to to to to to to Calibration of VDC Output Pressure Transducers Only 1. Connect terminals [+] and [-] to the appropriate power source. The [-] terminal is also the negative output terminal. 2. Connect the DVM on DC volts across the [0] and [-] terminals. 3. Apply low pressure to the transducer and carefully adjust the zero trimmer [Z] to obtain the desired low output pressure. 4. Apply high pressure to the transducer and adjust the span trimmer [S] to obtain the desired high output pressure. 5. Repeat steps 3 and 4 until the transducer is fully calibrated. Maintenance Perform regular maintenance on the total system to ensure the sustained optimum performance of the low pressure transducer. Field Repair Do not attempt to repair the low pressure transducer. Replace a malfunctioning transducer with a functional transducer if necessary. Warranty See the accompanying data sheet for additional information. Copyright Mamac Systems All rights reserved. Mamac Systems reserves the right to change any specifications without notice to improve the performance, reliability, or function of our products. IS.PR274/ Page 2 of 2