The Series 646B Differential Pressure Transmitter Is Designed To Be Used With Clean, Dry Air And Other Non-Corrosive Gases. Each Unit Features A Flame Retardant Enclosure And A Unique Design Which Is Suitable For Circuit Board Mounting. Series 646B Measures Differential Pressure At An Accuracy Of ±2.0% FS Down To 0.5 In W.C. The Transmitter Contains A Stainless Steel Sensor That Provides Resistance Against Corrosion Combined With Excellent Performance And Long Term Stability. The Series 646B Transmitter Features Excellent Stability, Low Hysteresis, Accurate Operation Over A Broad Temperature Range, And Exceptional Insensitivity To Vibration. These Features Make The Transmitters Perfect For VAV Systems, Filter Monitoring, HVAC Fan Control, Building Pressurization, And Leak Detection Systems.

Service: Air And Non-Combustible, Compatible Gases.

Wetted Materials: 302 SS, Glass, Nickel, Polyethylene, Acrylic And ABS.

Accuracy: ±2.0% FS* At Room Temperature. 
*RSS (Root Sum Square) Includes Non-Linearity, Hysteresis And Nonrepeatability.

Temperature Limits: 
Operating: 23 To 170°F (-5 To 77°C); 
Storage: -6 To 185°F (-21 To 85°C).

Compensated Temperature: 32 To 170°F (0 To 77°C).

Zero/Span Shift: < 0.05% FS/F (< 0.09% FS/C).

Warm-Up Shift: ±0.1% FS.

Position Effect: Unit Is Calibrated In A Vertical Position.

Pressure Limits: ±10 Psi (69 KPa).

Output Signal: 0.5 To 4.5 VDC Ratiometric.

Output Impedence: < 5.0 Ω.

Supply Voltage: 5.0 ±0.25 VDC.

Response Time: Approximately 10 Ms.

Electrical Connection: Three Stripped, Color-Coded Lead Wires, 26 AWG, Approximately 3.5" Length.

Process Connections: 3/16" OD Barbed Fitting For 1/8" ID Push-On Tubing.

Housing: PBT+ABS Alloy.

Weight: 3.1 Oz (90 G).