Series 648 Differential Pressure Transmitter enables precise measurement and control of differential pressures for filter monitoring, clean room pressurization monitoring, velocity pressure measurement, airflow control, fan tracking, and VAV control. The transmitter is designed with a variable-capacitance sensor for high sensitivity and greater repeatability. The compact size allows easy installation for panel or field mounting. Units include reverse polarity protection.

SPECIFICATIONS
Service: Clean, dry air and compatible, non-corrosive gases.
Wetted Materials: Stainless steel, nickel plated brass, glass and silicon.
Accuracy: ±1.0% F.S.O. (includes linearity, hysteresis, and repeatability).
Stability: ±1.0% F.S.O./yr.
Temperature Limits: -20 to 160°F (-29 to 71°C).
Pressure Limits: 10 psig (0.7 kg/cm²).
Compensated Temperature Range: 40 to 125°F (4 to 52°C).
Thermal Effects: Zero: ±0.025% F.S.O./°F, Span: ±0.025% rdg/°F).
Power Requirements: 12-36 VDC.
Output Signal: 4 to 20 mA, 2-wire.
Zero and Span Adjustments: Zero adjustable: ±5%, Span adjustable: ±3%.
Response Time: 250 ms.
Loop Resistance: 600 O @ 24 VDC.
Current Consumption: 3.6 mA.
Electrical Connections: Screw terminals.
Process Connections: Barbed for 1/8" or 1/4" I.D. tubing.
Housing: Stainless steel, NEMA 1 case.
Weight: 4.5 oz (128 g).
Agency Approvals: CE.