|Connection(s)||1/8” – 27 NPTM||1/8” – 27 NPTM||1/8” – 27 NPTM||1/8” – 27 NPTM||2×1/8”-27 NPTM|
|Switching||Low (Adjustable)||Low (Adjustable)||Low (Adjustable)||High/Low (Adjustable)||High (Adjustable)|
|Scale||PSI/ kPa||PSI/ kPa||PSI/ kPa||PSI/ kPa||PSI/ kPa|
The 20DP and 25DP mechanical pressure switchgage series mechanism is enclosed in a steel case coated to resist corrosion. The A20DP and A25DP series have a polycarbonate case and are sealed from the environment. All feature a polycarbonate, break-resistant lens and a polished, stainless steel bezel to help protect these rugged, built-to-last instruments.
The mechanical pressure switchgage pointer acts as a pressure indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Contacts have self-cleaning motion to ensure electrical continuity.
20DP, 25DP, A20DP and A25DP Swichgage instrument
The gage pointer makes with an adjustable contact to complete a pilot-duty circuit.
20DPE, 25DPE, A20DPE and A25DPE Swichgage instrument
20DPE (was 20DPEO), 25DPE (was 25DPEO), A20DPE (was A20DPEO) and A25DPE (was A25DPEO).
Features an internal snap-acting SPDT switch, instead of the single pole/pointer contacts. When the switch closes on rising pressure, it becomes set, as pressure falls the switch resets. 20DPG, 25DPG, A20DPG and A25DPG Murphygage instrument gage without contact(s)
Dial: White on black, dual scale; U.S.A. standard scale is psi/kPa; U.K. standard scale is psi/bar.
Case: Polycarbonate/glass filled, corrosion-resistant; steel mounting clamp included
Bezel: Polished stainless steel, standard; others are available.
Pointer: Tempered nickel silver; Red tip.
Lens: Polycarbonate, high-impact.
Oil: Silicon Oil.
Process Connection: 1/8-27 NPTM brass.
Sensing Element: Beryllium copper diaphragm.
Gage Accuracy (% of Full Scale):
|RANGE||LOWER 1/4||MIDDLE 1/2||UPPER 1/4|
|=300 psi (20 Bar)||±3%||±2%||±3%|
|400 psi (28 Bar)||±3%||±3%||±5%|
Maximum Pressure: See Pressure Ranges and Factory Settings table.
Adjustable Limit Contact (A20P and A25P): SPST contact; pilot-duty only, 2A@30 VAC/DC; Closed when the low limit is met. Open when pointer is in normal operating range. Contacts are gold flashed silver. Limit Contact Adjustment: by a 1/16 in. hex wrench through 100% of the scale.
Wiring: A20P: Number 4 screw terminals; A25P: Number 6 screw terminals
Snap-Switch Rating (A20PE and A25PE): SPDT, 3 A@ 30 VDC inductive; 4 A @ 125 VAC inductive
Wiring: A20PE: Number 4 screw terminals; A25PE: Number 6 screw terminals.
Unit Weight: A20 Series: 8 oz. (0.23 kg); A25 Series Models: 11 oz. (0.31 kg).
Unit Dimensions: A20 Series: 3 x 3 x 3 in. (76 x 76 x 76 mm); A25 Series Models: 4-3/4 x 4-3/4 x 2-3/4 in. (121 x 121 x 70 mm)