2 Introduction
The Hart 1522 is a low-cost,high-accuracy digital thermometer readout de-
signed to beu sed withPRTs and thermistors. The unique combination of fea-
tures makes this instrument suitable for a wide variety of applications in
industry.Features and capabilities of the 1522 include the following:
•Accepts input from platinum resistance thermometers (PRTs) and therm-
istors
•Works with Hart’s INFO-CON probe connector (which is partially based
on U.S. Patent 5,857,777) to automatically recognize the type of sensor
and its characteristics
•Alerts the operator automatically when the probe calibration or meter cal-
ibration expires
•Measures with an accuracy of ±0.025°C at 25°C with PRTsand ±0.005°C
at 25°C with thermistors
•Accepts three- or four-wire sensors to eliminate lead resistance errors
•Measures with a fast one-second measurement cycle
•Displays maximum, minimum, and delta temperatures
•Uses a unique factory-assigned passcode to protect programmed settings
•Displays measurements and settings on a high-contrast LCD display
•Communicates with other equipment or a computer using an RS-232 se-
rial interface
•Can be powered from its AC adapter or rechargeable battery
•Stores up to 10,000 readings with reading, units, date, time, and label in
autologging mode at user selected intervals
•Stores up to 100 readings with reading, units, date, time, and label in de-
mand logging mode
•Contains an infrared interface for fast downloading of logged data
•Stores 25 labels (8 characters) for easy recognition of logged data
•Stops logging once maximum readings are stored. Memory must be
cleared to store additional data
•Starts and stops logging both from the front panel and through the
RS-232 and infrared interfaces
•Allows user to select a label for every reading stored in demand logging
mode
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2 Introduction