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.

SPECIFICATIONS
Service: Liquid, gas or vapor.
Wetted Materials: 316L SS.
Body: 316 SS.
Accuracy: ±0.25% of calibrated span.
Stability: ±0.5% of upper range limit for six months.
Temperature Limits: Process Interface -40 to 212°F (-40 to 100°C).
Pressure Limits: 300% full scale.
Compensated Temperature: -20 to 180°F (-29 to 82°C).
Thermal Effect: (includes zero and span) ±.02% upper range/°F (30 to 130°F), ±.032% upper range/°F (-20 to 180°F).
Power Requirements: 12 to 40 VDC with reverse polarity protection.
Output Signal: 4 to 20 mA DC, max. 30 mA DC (2-wire).
Zero and Span Adjustments: ±10% each.
Loop Resistance: 600 ohms @ 24 VDC; max. ohms = (supply voltage - 12) x 50.
Electrical Connection: 1/2" female NPT.
Process Connection: 1/2" female NPT.
Response Time: Time constant of 20 ms.
Weight: 1.67 lb (752 g).
Agency Approvals: CE, FM.