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Refrigerant Gauges


HM8443 series side mounted refrigerant level gauges are equipped with proportional voltage output or voltage output TwinSite® sender capsules with ranges of 1-2 volts, 1-6 volts or 0.5 to 4.5 volts output Hall Effect. They interface with various microprocessor based controllers now being used in commercial/supermarket applications for continuous, repeatable measurement of refrigerant levels and rates of loss.

General Information & Features

These gauges feature a 4-bolt brass head with integral mounting pads to accommodate the attachment of an electrical junction box. The junction boxes furnished with these gauges are not watertight and it is recommended that the connections inside boxes be made using waterproof connectors for rooftop and other outdoor service applications.

These gauges are typically furnished with neoprene gaskets which are compatible with several commonly used refrigerants and lubricants. Other gasket materials may be available.

The dials furnished with these gauges are magnetically driven. This means that the dials may be removed and replaced by removing two #6-32 screws and without disturbing the four gauge mounting bolts and releasing receiver contents.

The dials on gauges orignally equipped with direct read or direct read plus voltage output are typically interchangeable. In other words, a 1-2 volt output dial could be replaced with a 0.5 to 4.5 volt Hall Effect dial by removing only two #6-32 screws.

Hall Effect dials with 0.5 to 4.5 volt output introduce previously unavailable levels of noise free reliability and longevity. All dials with direct read only and direct read with voltage output are for use in both indoor and outdoor locations.


Data Sheet

TS015 - Hall Effect Twinsite for Refrigerant Liquid Level Gauges

MS-501/502 Installation Instructions

Adapters 22 Series - Senior Forged Steel

Model Output Tank Depth
HM8443-00056 1-6 Volt 10"
HM8443-00057 12"
HM8443-00058 14"
HM8443-00053 1-2 Volt 10"
HM8443-00054 12"
HM8443-00055 14"

General Specifications*

Temperature Range

Standard range is -40°F to 158°F, -40°C to 70°C.


Rochester Senior® adapter (typically part # 0022-05200).

Voltage Input

24 VDC maximum.

Working Pressure

450psig [31 Bar].


UL recognized refrigeration component.


When Ordering Specify:

1. Complete part number of gauge required (see above).

2. For replacement gauges, information stamped on the gauge head (see example above).

3. Part number of gasket desired.


*Materials and specifications are subject to change without notice. Pressure ratings subject to change due to temperature and other environmental considerations.

Materials of Construction*


Brass forging.

Junction Boxes & Covers

Plated steel.

Centershaft, Centershaft Bearings, Pinion & Sector Gears, Cross Stud & Bearing

Stainless steel.

Gear Housing

Brass forging.



Float Rod

Tempered aluminum.

Float Bulb

One-piece aluminum.



TwinSite® Sender

Polycarbonate, ultrasonically welded and hermetically sealed.

Mounting Bolts & Dial Screws

Stainless steel.


Choice of:

Type Part Number
Neoprene 0015-00836 (standard)
Buna-N 0015-00004 (optional)
Viton 0015-00415 (optional)