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2 Introduction
The 1521 Handheld Thermometer Readout is a low-cost, high-accuracy digital
thermometer readout designed to be used with PRTs and thermistors. The
unique combination of features makes this instrument suitable for a wide vari
-
ety of applications in industry. Features and capabilities of the 1521 include the
following:
•
Measures with platinum resistance thermometers (PRTs) and thermistors
•
Works with Hart’s special 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
•
Automatically alerts the operator when the probe calibration or meter cal
-
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
• Is immune to thermoelectric EMF
• Measures with a fast one-second measurement cycle
• Displays maximum, minimum, and delta temperatures
• Stores up to six measurements in memory
• Uses a unique factory-assigned pass-code to protect programmed settings
• Displays measurements and settings on a high-contrast LCD display
• Communicates with other equipment using an RS-232 serial interface
•
Can be powered from its AC adapter or rechargeable battery
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2 Introduction