Rosemount 3144P temperature transmitter
I have a Rosemount 3144P with a range of 0 to 150 degrees Fahrenheit. I was using a test device to simulate RTD input to the transmitter, where on 0 degrees Fahrenheit I have 4 mA and on 150 I have 20. Do I need to calibrate or adjust the transmitter to read the same temperature as the probe? Is the RTD bad? .
Calibrating Rosemount 3144P temperature transmitter
Okay, so you have a Rosemount 3144P temperature transmitter. You test it using the calibrated probe, and the Rosemount 3144 pulls good values, right? That means you have to test the field sensor. To do this, you’ll need to check the sensor’s temperature curve. If you don’t know how to do that, then come on in and have a seat.
Calibrating with a multimeter
One way to check your sensor calibration is with a temperature bath and a multimeter. Just stick the sensor in the bath with a pre-set temperature. Then grab your voltmeter, read the value you get, and cross-check it on the sensor table. The temperature from the bath should match what you read from the multimeter.
Using a calibrator
In the market, you can find all sorts of gizmos, like the FLUKE 744 and the Beamex MC6. Calibrating your sensor with these devices is even easier than using a voltmeter, especially if you have a thermocouple and need the cold junction calibration. Why? Because the calibrator will do the compensation for you! Connect the sensor in the bath to the calibrator, then wait for a stable reading. Once you get that, register the value and change to the next point.
Another method you can use to calibrate your sensor is to compare it with a second sensor with a known accuracy. In this method, you’ll have both the reference probe and your sensor in the bath. Then you can compare the readings you get from each to see whether they match.
If you have a thermocouple as a sensor, the Fluke 52 II dual input digital thermometer might help. With this device, you can connect both sensors to it and compare them. If you want to know more about the Fluke 52 II, we have a product review. Go check it out.
Calibration with the Rosemount 3144
So, if your sensor reads out of spec, then replace it. But if not, then you need to go back to the Rosemount temperature transmitter and adjust the trim. To do that, you need to install the sensor and your transmitter together.
The sensor trim command lets you correct the linear offset and slope correction. So connect the sensor to the Rosemount 3144P, then place the sensor in the bath between the range points. Now enter the bath temp using your field communicator. For the slope correction, just repeat the procedure to the high range point.
These are the steps from the field communicator, according to the menu structure: 1 > 2 > 2 > 1 > 1. If you need to know more about the Rosemount temperature transmitter, then check out the manual!
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