One of Hartâ€™s best/selling products is the Tweener thermometer, and thereâ€™s a reason. No other company has a 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 Â±0.006Â°C (the 1504 is even more accurate, up to Â±0.002Â°C). In addition, it reads 100/ohm, 25/ohm, and 10/ohm probes, has a resolution of 0.001Â°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 probeâ€™s constants for maximum linearity and accuracy. All probe constants and coefficients are programmed through simple, front/panel keystrokes. Temperature is displayed inÂ°C,Â°F, K, or resistance in ohms.
The 1502/A/156 accurately measures the resistance of the probe and then converts the resistance to a temperature value using its built/in algorithms.
For convenience, the 1502A156 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 Tweenerâ€™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.