Dwyer Series 645 |
Wet/Wet
Differential Pressure Transmitter |
±0.25%
Accuracy. Quick Response. Two Wire Design |
Series
645 Wet/Wet Differential Pressure Transmitters are designed
for use with compatible gases and liquids which can be applied
to both the pressure and reference ports. Quick response capacitance
sensor delivers a 4 to 20 mA output signal proportional to
differential pressure with ± 0.25% accuracy. The Series
645 transmitters are ideal for process control, filter condition
monitoring, refrigeration equipment, pump speed control, HVAC
equipment, and liquid level measurement.
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PHYSICAL DATA |
- Service: Compatible gases or liquids on both pressure
and reference sides.
- Output: 4 to 20 mA, 2-wire.
- Supply Voltage: 11 to 30 VDC.
- Loop Resistance: 0 to 1000W.
- Zero and Span: Adjustable, non-interactive.
- Max Line Pressure: 250 psig.
- Max Overload Pressure: (High side) 1 to 5 psi: 20 x FS,
10 to 25 psi: 10 x FS, 50 psi: 5 x FS, 100 psi: 2.5 x FS;
(Low side) 2-3 x FS.
- Temperature Limits: Operating: 0 to 175°F (-22 to
80°C), Storage: -65 to 260°F (-54 to 126°C)
- Accuracy: ± 0.25% FS (RSS).
- Response Time: 30 to 50 msec.
- Thermal Effects: (includes zero and span) ± 0.02%
FS/°F, 30 to 150°F (-1 to 65°C).
- Wetted Parts: 17-4 PH stainless steel, 300 Series stainless
steel, Viton and Silicone O-rings and bleed screw seals.
- Housing: Stainless steel/ Aluminum.
- Process Connection: ¼" - 18 NPT(F).
- Electrical Connection: Barrier strip terminal block with
conduit enclosure and .875" (22mm) diameter conduit
opening.
- Weight: 14.4 oz (0.4 kg).
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MODELS NUMBERS (stock shown in bold) |
Model Number |
Range |
645-1 |
0 to 2 psid |
645-2 |
0 to 5 psid |
645-3 |
0 to 10 psid |
645-4 |
0 to 25 psid |
645-5 |
0 to 50 psid |
645-6 |
0 to 100 psid |
645-11 |
+- 1 psid |
645-12 |
+- 2.5 psid |
645-13 |
+- 5 psid |
645-14 |
+- 10 psid |
645-15 |
+- 25 psid |
645-16 |
+- 50 psid |
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