Adjustable Range Pressure Transmitter- Series 637
Stainless Steel, Intrinsically Safe, Explosion-proof, Accuracy ±0.25%, 4-20 mA Signal.
Series 637 Pressure Transmitters are durable and compact with all welded 316 stainless steel construction and exceptional ±0.25% accuracy. Four ranges are offered up to 0-300 psig (0-20 bar). Zero and span are adjustable to ±10% each; range turndown is a full 5:1. Integral junction box simplifies field wiring. Output is 4-20 mA with 12-40 VDC power supply. Units are explosion-proof, intrinsically safe with FM approval and they meet NACE standards for off-shore applications.
| Service: | Liquid, Gas or Vapor |
|---|---|
| Output: | 4-20 mA DC, max. 30 mA DC (2 wire) |
| Power Supply: | 12 to 40 VDC with reverse polarity protection |
| Loop Resistance: | 600 @ 24 VDC; max. = (supply voltage - 12) x 50 |
| Turndown: | 5:1 |
| Zero and Span Adjust: | ±10% each |
| Temperature Limits: | Process Interface -40 to 212°F (-40 to 100°C) |
| Accuracy: | ±0.225% of calibrated span |
| Response Time: | Time constant of 20 ms |
| Stability: | ±0.5% of upper range limit for six months |
| Thermal Effect: | (includes zero and span) ±0.02% upper range/°F (30 to 130°F) ±0.032% upper range/°F (-20 to 180°F) |
| Wetted Parts: | 316 L SS |
| Pressure Port andElectrical Connection: | ½" NPT(F) |
| Body: | 316SS |
| Weight: | 167 lbs. (752 g) |
| ModelNumber | StockRange, PSI | MinimumRange, PSI | StockRange, Bar | MinimumRange, Bar |
|---|---|---|---|---|
| 637-0 637-1 637-2 637-3 |
0-15 0-30 0-100 0-300 |
0-3 0-6 0-20 0-60 |
0-1 0-2 0-7 0-20 |
0-0.2 0-0.4 0-1.4 0-4 |
SUGGESTED SPECIFICATIONS :- SPressure transmitter body shall be 316 stainless steel with 4 adjustable ranges to 0/300 PSIG (0 to 20 bar) with 5:1 turndown and accuracy of ±0.25%. Unit shall be FM approved intrinsically safe for Class I, II & III, Division 1, Group A, B, C, D, E, F &G for Hazardous Locations, and explosion-proof for Class I, Division 1, Groups B, C, D; Dust-ignition proof for Class II, Division 1, Groups E & G and suitable for Class III, Division 1; Hazardous Locations, NEMA 4 Enclosure. Transmitter shall be Dwyer Model No. 637____.