Henry Catalogue 2010 - page 92

Industrial & Commercial Refrigeration Products
1000 psi Working Pressure (Rotolock)
12-32VDC Supply Voltage
Maximum Load: Up to 2K ohms with less than
a 5% shift in output.
Optional Relay for 20% low level alarm
Relay Ratings: 125V @ 12A Resistive
250V @ 7A Resistive
Output: 0V-5VDC, or 1V-6VDC, or 4-20mA
Ambient Temperature: -40 to 158°F
Refrigerant Temperature: Suitable for all available refrigerants.
Refrigerants: R22, R134a, R404a, R507, R410a, and other
compatible refrigerants.
Continuous accurate measurement of receiver liquid level.
Optional relay can provide a level indication to a remote alarm
system to show insufficient refrigerant quantity.
Unless otherwise indicated, probes are calibrated for R404a /
R22. This standard calibration also works with R134a, R507
and R410a within 5% of receiver level.
The Henry Technologies LLP Series probes are factory calibrated
for a 16” diameter vertical receiver and diameters or refrigerants.
To obtain maximum accuracy, the probe can be re-calibrated after
the system has been in operation and conditions have stabilized.
Re-Calibration Procedure:
1. Monitor the output voltage using a voltmeter installed in
parallel with the signal and common leads of the control
loop. (terminals 2 & 3 on the wiring diagram)
2. Lower the refrigerant level in the receiver to a level
equal to 0%. Adjust the “Zero” calibration screw for a
voltmeter reading of 0.0 volts DC.
3. Raise the refrigerant level in the receiver to a level
equal to 50% level. Adjust the “Span” calibration screw
for a voltmeter reading of 2.5 volts DC.
The re-calibration is complete.
For applications which require a 1-6V or 4-20mA output, consult
the factory.
The LLP level probe measures receiver refrigerant level by sensing a change in capacitance between the LLP probe rod and the receiver
tank wall. As the liquid refrigerant changes in level it changes in output voltage between 0 and 5 volts. In other words, 2.5 volts can be
scaled to indicate a 50% liquid level. 0% level is typically set as one inch from the tank bottom. 100 % level is typically set as the receiver
90% fill level.
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