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2 Introduction
The Hart 1522 is a low-cost, high-accuracy digital thermometer readout de
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signed to be used with PRTs and thermistors. The unique combination of fea
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tures makes this instrument suitable for a wide variety of applications in
industry. Features and capabilities of the 1522 include the following:
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Accepts input from platinum resistance thermometers (PRTs) and therm
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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
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ibration expires
•
Measures with an accuracy of ±0.025°C at 25°C with PRTs and ±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
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Stores up to 100 readings with reading, units, date, time, and label in de
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mand logging mode
•
Contains an infrared interface for fast downloading of logged data
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Stores 25 labels (8 characters) for easy recognition of logged data
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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