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Reference Thermometer Readouts for RTD, PRT, and Thermistor Sensors - 1502A (1502) and 1504

• Features
• Specifications
• 1502A Tweener PRT Readout
• 1504 Tweener Thermistor Readout
• Ordering Information
• Downloads

Features

• Two Tweeners to choose from—reading PRTs or thermistors 
• Battery packs available 
• Best price/performance package

One of Hart’s best-selling products is the Tweener thermometer, and there’s a reason. No other company, not one, has a reference thermometer that comes close to the performance and features of the Tweener for anywhere near its price. 

1502A Tweener PRT Readout 

The 1502A Tweener features accuracy up to ±0.006 °C (the 1504 is even more accurate, up to ±0.002 °C). In addition, it reads 100-ohm, 25-ohm, and 10-ohm probes, has a resolution of 0.001 °C across its entire range, and is the smallest unit in its class. It also has an optional battery pack for completely portable operation. 

Each Tweener is programmable to match a probe’s constants for maximum linearity and accuracy. All probe constants and coefficients are programmed through simple, front-panel keystrokes. Temperature is displayed in  °C,  °F, K, or resistance in ohms. 

The 1502A accurately measures the resistance of the probe and then converts the resistance to a temperature value using its built-in algorithms. 

For convenience, the 1502A reads the common industrial grade IEC-751 or “385” ALPHA RTD without any programming. Enter the actual R0 and ALPHA of the individual probe for increased accuracy. For maximum accuracy, use the ITS-90 formulas. The Tweener accepts the subranges 4 and 6 through 11. 

ITS-90 formulas reside in the Tweener’s firmware. If your probe has been calibrated for any of the above subranges of the ITS-90, you simply enter the coefficients directly into your Tweener. 

Each thermometer comes complete with an RS-232 interface for automation of temperature data collection, calibrations, or process control functions. An IEEE-488 interface is available as an option. 

The 1502A is calibrated digitally using the front-panel buttons. You never have to open the box to calibrate it. This calibration protocol further reduces the cost of the 1502A. It goes where you go and works the way you want it to. 

1504 Tweener Thermistor Readout 

If you need more accuracy in a limited temperature range, the Model 1504 Tweener gives it to you as a thermistor readout. Thermistors are less fragile than PRTs and less likely to be impacted by mechanical shock. Thermistors are more sensitive to temperature, have faster response times, and come in many shapes for different applications. 

Typical accuracy of a 1504 is ±0.002 °C with a resolution of 0.0001 °C. 

Software 

With our 9934 LogWare, both Tweener models may be used for real-time data acquisition. Collect data and analyze it graphically or statistically. Additionally, Tweeners may be used as reference thermometers with our MET/TEMP II software.

Battery pack 

Want to take your Tweener on the road? Order Hart’s 9320A Battery Pack. Our battery gives you 36 hours between charges, allowing you to take your work wherever you need.

Calibration choices 

Each Tweener and its accompanying probe (sold separately) have their own individual calibration reports. Overall system error can be calculated from the individual errors, rendering the added cost of system data unnecessary. However, for those requiring it, system data is available at two or more temperatures of your choice. (See Calibration Model 1929-X )

Back to Specifications

Ordering Information

Downloads

Right click one of the following links and “Save Target As ...” to download the catalog pages/data sheet or a product User's Guide in Acrobat (.pdf)  format.

• Catalog page(s)/data sheet
• 1502A User's Guide - File size is  426 Kb.
• 1504 User's Guide - File size is  419 Kb.

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