This document is the instruction manual for Anderson temperature instruments. It introduces the operation and maintenance methods of the instrument.
The Anderson Instrument FH3 and FH4 Digital Temperature Gauges are fully electronic, battery-powered devices designed as Alternate Temperature Indicating Devices for use in retorts. They feature a dual-element design for continuous error checking and meet Code of Federal Regulations requirements for processing low acid canned foods. The units are shipped fully calibrated and include a low battery indicator.
| Process Temp. Range | 0 to 300°F (-18 to 150°C) |
|---|---|
| Accuracy | +/- .5°F (+/-0.3°C) |
| Display | 4 digit main display, 6 digit secondary |
| Battery Life | 18 months typical |
| Warranty | 2 year |
The device requires specialized Thionyl Chloride Lithium batteries with a nominal capacity of 2.4 Ah and an operating voltage of 3.6 VDC.
Standard alkaline batteries may be used but typically have a shorter life and may be affected by high temperature, potentially causing battery leakage.
If the discrepancy between the primary and secondary elements exceeds 0.5 degree F, the unit will display an error condition alternating between the two readings.