The Henry G. Dietz Co., Inc.
Industrial Pressure Switches • Vacuum Switches • Differential Switches
DIETZ MODELS 170D AND 171D SPECIFICATIONS
Dietz 170D / 171D Technical Specifications (526KB PDF)
Operating Ranges
- A variety of models, with factory-set actuation points from 0.05" to 40.0" H2O (171D)
- Actuation points can be adjusted within the limits on switch nameplate
Electrical
- Single pole double throw snap-switch
Construction
- 0.008" Buna (Nitrile) coated nylon diaphragm for temps of -30° F to 160° F. Silicone coated cloth can be used for greater temperature extremes
- Sturdy zinc die cast, steel, and aluminum stampings
- For military use, aluminum parts can be anodized in
accordance with Military Specification
MIL-A-8625 , Class 2, Type I. Snap switch bodies are of a non-nutrient plastic material.
DIETZ MODELS 170D / 171D
Ultra Low Differential Pressure Switches for Harsh Environments
The Dietz Model 170D Ultra Low Differential Pressure Switch combines extremely low pressure actuation, maximum electrical ratings and rugged construction to withstand unusually harsh environments. The 171D is shock and vibration resistant, due to a minimum number of moving parts and the absence of lever amplifiers, and will actuate at 1" H2O under extreme shock and vibration conditions. Overpressure of 25 lbs. per square inch will not damage the switch or change calibration settings. Diaphragm movement is limited to provide extremely long diaphragm life.
This rugged but simple design makes the Dietz 170D ideal for use on locomotives, ships, construction equipment, and variety of outdoor applications. A highly resistant epoxy finish is available for use where corrosive fumes or acids are present, such as in chemical plants, plating rooms, and sewage plants.
FEATURES / BENEFITS
- Sense pressure, vacuum, or differential pressure
- Shock and vibration resistant (
MIL-STD-167-1 andMIL-STD-901-D ) - Covers a broad operating range
- Model 171D actuates at 0.05" H2O
- Heavy gauge steel mounting bracket
- Gasket seals cover against dirt and oil
- Pressure connection available for use with liquids
APPLICATIONS
- Air flow interlock
- Liquid level control
- Output for fluid amplifiers
- Measurement, sensing, switching, sequencing in simple fluidic circuits requiring an auxiliary air supply
AC Switches |
Operating Range |
Approximate Dead Band |
125V, 250V, 480V |
|
Min. |
Max. |
|||
170D8W-S |
1.0" to 8.0" H20 |
0.2" H2O |
0.4" H2O |
10 Amp VAC |
170D8W |
2.0" to 8.0" H20 |
0.3" H2O |
0.5" H2O |
15 Amp VAC |
170D20W |
2.0" to 20.0" H20 |
0.3" H2O |
0.5" H2O |
15 Amp VAC |
170D40W |
2.0" to 40.0" H20 |
0.3" H2O |
0.5" H2O |
15 Amp VAC |
DC Switches |
Operating Range |
Approximate Dead Band |
75 DC 0.5A |
|
Min. |
Max. |
|||
170D8W-S-DC |
1.0" to 8.0" H20 |
0.4" H2O |
0.6" H2O |
10 Amp VAC, VDC - see above |
170D8W-DC |
2.0" to 8.0" H20 |
0.8" H2O |
1.0" H2O |
15 Amp VAC, VDC - see above |
170D20W-DC |
2.0" to 20.0" H20 |
0.8" H2O |
1.0" H2O |
15 Amp VAC, VDC - see above |
170D40W-DC |
2.0" to 40.0" H20 |
0.8" H2O |
1.0" H2O |
15 Amp VAC, VDC - see above |
171D8WC-S |
0.05" to 8.0" H2O |
0.03" H2O |
0.3" H2O |
10 Amp VAC, VDC - see above |
171D8WC |
0.15" to 8.0" H2O |
0.05" H2O |
0.3" H2O |
15 Amp VAC, VDC - see above |
171D8WC-S-DC |
0.05" to 8.0" H2O |
0.03" H2O |
0.3" H2O |
0.75 Amp VAC, 75 VDC - see above |
For OEM installations, Snap Switch Enclosure can be omitted.