Hansen Pressure/Temperature Transducer HPT717
The Hansen Pressure/Temperature Transducer is designed to measure both temperature and pressure within a single connection. Electronics calculate superheat or sub-cooling for the specified refrigerant with a 4-20 mA Output.
Base model is suitable for ammonia. Also suitable for halocarbons, propane, and carbon dioxide with the appropriate refrigerant key. Standard model HPT is suitable for -35oF to +150oF (-37oC to +65oC). Low temperature model HPTL is suitable for -60oF to +150oF (-51oC to +65oC). Low temperature models have a longer insertion length.
INTRODUCTION Temperature and pressure determine whether a refrigerant is at saturation, superheat, or subcooling. The Hansen Pressure/ Temperature Transducer measures both temperature and pressure within a single sensor. Electronics in the sensor then calculate the superheat or subcooling for the specified refrigerant. This value is converted to a milliamp signal for use by a customer supplied computer or controller. APPLICATIONS Measurement of superheat to control an electronic expansion valve for a DX evaporator. Measurement of subcooling. Measurement of non-condensible gas in a refrigeration system, which because it has a pressure higher than expected at the given temperature looks like subcooling. Measurement of superheat to monitor/ control de-superheater temperature. Measurement of superheat to monitor/control suction gas temperature to compressor.
KEY FEATURES Specifically designed for industrial refrigeration Solid-state electronics Computer compatible, 2-wire 4-20 mA signal output DIN plug standard, or optional 1/2” NPSM Quick Disconnect Single 3/4” NPT fitting to system Watertight NEMA 4 (IP65) enclosure Base model is suitable for ammonia Also suitable for R22, R134a, and many other refrigerants with the appropriate refrigerant key SPECIFICATIONS Supply Voltage: 12-30 VDC Signal Output: 4-20 mA proportional to superheat or subcooling (see page 2) Maximum Load Resistance: 1200 Ohms at 24 VDC Ambient Temperature Range: –20°F to +125°F (–30°C to +50°C) Refrigerant Temperature: Standard Model HPT -35oF to +150oF (-37oC to +65oC) Low Temperature Model HPTL -60oF to +150oF (-51oC to +65oC) Enclosure: NEMA 4, watertight (IP65) Accuracy: +/- 1°F (0.6°C) superheat / subcooling Safe Working Pressure: 400 psig (28 bar) Pressure Sensing Range: 29 in-Hg to +285 psig (-1 to +19 bar) Transducer Body: steel, zinc plated with yellow chromate Connection Style: 3/4” NPT