Series 668 Differential Pressure Transmitter
Ranges from 0 to 0.25″ w.c., Overpressure Protection to 10 psig, ±1% Accuracy
Our low cost Dwyer Series 668 Differential Pressure Transmitter is capable of measuring low pressures with a ±1% accuracy – ideally suited for proper building pressurization and air flow control. Transmitters can withstand up to 10 psig overpressure with no damage to the unit. Variable capacitance sensor design provides excellent sensitivity and long-term stability. Compact, lightweight design makes installation simple and easy. Units also feature reverse-polarity protection.
Specifications
- Service:Air and non-conductive gases.
- Accuracy:±1% of full scale (RSS), (includes non-linearity, hysteresis, and non-repeatability).
- Temperature Limits:Operating: 0 to 150°F (-18 to 65°C), Storage: -40 to 185°F (-40 to 85°C).
- Pressure Limits:10 psig (0.69 bar).
- Compensated Temperature Range:0 to 150°F (-18 to 65°C).
- Thermal Effects:0.033% FS/°F (0.18% FS/°C).
- Supply Voltage:12-30 VDC.Output:4 to 20 mA, 2-wire.
- Zero and Span Adjustment:±1 mA, non-interactive.
- Response Time:<60 msec.
- Loop Resistance:0-800 ohms.
- Electrical Connection:Terminal strip.
- Pressure Connection:3/16″ O.D. fitting for 1/4″ I.D. tubing.
- Housing:Fire retardant glass filled polyester.
- Weight:3 oz (85 g).
- Agency Approval:CE.
Available Models
Bi-Directional Ranges
| MODEL | DESCRIPTION |
|---|---|
| 668-10 | Differential pressure transmitter, range 0 to ±0.1" w.c. |
| 668-11 | Differential pressure transmitter, range 0 to ±0.25" w.c. |
| 668-12 | Differential pressure transmitter, range 0 to ±0.5" w.c. |
| 668-13 | Differential pressure transmitter, range 0 to ±1" w.c. |
| 668-14 | Differential pressure transmitter, range 0 to ±2.5" w.c. |
| 668-15 | Differential pressure transmitter, range 0 to ±5" w.c. |
| 668-16 | Differential pressure transmitter, range 0 to ±10" w.c. |
| 668-17 | Differential pressure transmitter, range 0 to ±25" w.c. |
| 668-18 | Differential pressure transmitter, range 0 to ±50" w.c. |
Standard Ranges with Conduit Cover
| MODEL | DESCRIPTION |
|---|---|
| 668C-1 | Differential pressure transmitter with conduit cover, range 0-0.25" w.c. |
| 668C-2 | Differential pressure transmitter with conduit cover, range 0-0.5" w.c. |
| 668C-3 | Differential pressure transmitter with conduit cover, range 0-1.0" w.c. |
| 668C-4 | Differential pressure transmitter with conduit cover, range 0-2.5" w.c. |
| 668C-5 | Differential pressure transmitter with conduit cover, range 0-5.0" w.c. |
| 668C-6 | Differential pressure transmitter with conduit cover, range 0-10" w.c. |
| 668C-7 | Differential pressure transmitter with conduit cover, range 0-25" w.c. |
| 668C-8 | Differential pressure transmitter with conduit cover, range 0-50" w.c. |
| 668C-9 | Differential pressure transmitter with conduit cover, range 0-100" w.c. |
Bi-Directional Ranges with Conduit Cover
| MODEL | DESCRIPTION |
|---|---|
| 668C-10 | Differential pressure transmitter with conduit cover, range 0 to ±0.1" w.c. |
| 668C-11 | Differential pressure transmitter with conduit cover, range 0 to ±0.25" w.c. |
| 668C-12 | Differential pressure transmitter with conduit cover, range 0 to ±0.5" w.c. |
| 668C-13 | Differential pressure transmitter with conduit cover, range 0 to ±1" w.c. |
| 668C-14 | Differential pressure transmitter with conduit cover, range 0 to ±2.5" w.c. |
| 668C-15 | Differential pressure transmitter with conduit cover, range 0 to ±5" w.c. |
| 668C-16 | Differential pressure transmitter with conduit cover, range 0 to ±10" w.c. |
| 668C-17 | Differential pressure transmitter with conduit cover, range 0 to ±25" w.c. |
| 668C-18 | Differential pressure transmitter with conduit cover, range 0 to ±50" w.c. |