Martel Electronics BetaGauge 321A-Ex - Manual (Page 17)

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3.1 Media Compatibility
The calibrator utilizes a media isolated sensor to prevent sensor contamination.
Whenever possible clean, dry air is the media of choice. If that is not always possible,
make sure that the media is compatible with Nickel Plated Brass and 316 Stainless Steel.
4. Measuring Current
Warning
Check entity parameters before making any connections to this device.
To measure current use the input terminals in the front of the calibrator. Select the mA
function on one of the displays. Current is measured in mA and percentage of range.
The range on the calibrator is set to 0% at 4 mA and 100% at 20 mA.
Note: The display will indicate “OL” when the measured current exceeds the nominal
range of current measurement (24 milliAmps).
For example:
If the current measured is displayed as 75% then the mA value is 16 mA.
Figure 6
5. Measuring Temperature with an RTD
To measure temperature using an RTD probe you must select the RTD function on one of
the displays. Make sure the proper probe type is selected. There are 4 probe types
supported, P100-385, P100-392, P100-JIS and CUSTOM. The standard probe has a 9”
insertion depth with a 3/16” diameter stainless steel sheath.
Note: The factory default type is PT100-385 so if the 311A-Ex/321A-Ex is being used with
the Martel Model LPT100A probe you do not have to set the probe type. Simply plug the
probe into the 311A-Ex/321A-Ex and configure the display to read temperature.
Note: The display will indicate “OL” when the measured temperature is outside the
nominal measurement range of the RTD function (below -40°C or above 150°C).
If a custom probe is being used, the entering of R0 and coefficients is handled through
the serial interface (see section 11).