West Control Solutions MRC 5000 Recorder Manual - Manual (Page 22)

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After selecting the proper range code, depress the SCROLL key and rEF should be displayed.
With rEF displayed, depress the SCROLL key to display the value for the source to be connected. Connect the input source
set for this value to the selected input terminals. After connecting the source, depress the SCROLL key and SCAn should be
displayed. When rAng selected is 5, connect the J type thermocouple to the input terminals. Position the "HOT" junction
outside the enclosure with the mercury thermometer position along side. Using the UP or DOWN keys, make the display
match the reading seen on the mercury thermometer.
With SCAn displayed, depress the SCROLL key. The display will count up in seconds, denoting that it is proceeding with the
calibration. When the calibration is complete, the display will show PEn.
With PEn displayed, depress the SCROLL key to select another pen, or UP to return to inP.
If something fails in the process, FAIL will be displayed. Depress any key to return to the inP display.
The reference values needed to calibrate each input type are as follows:
CODE REFERENCE VALUE
1-millivolt/TC 50.00mV ±0.01mV
2-volt 5.00 Volts ±0.01V
3-milliamp 20.00mA ±0.01mA
4-RTD 200.0ohms ±0.01%
5-T/C AMBIENT
5.2 CHART/PEN CALIBRATION - Chrt
This Cal section calibrates the pens to the chart, and is divided into two additional sections: PEn and ArC. PEn calibrates the
pen spans to the chart. ArC provides a capability to make the pens sweep the chart to facilitate mechanical adjustments of
pen arms.
PEN SPAN CALIBRATION - PEn
With Chrt in the display, press DOWN to enter the Chart calibration section and PEn will be displayed. Depressing the
SCROLL key will toggle between PEn and ArC. With PEn in the display, press DOWN to enter the Pen Span calibration
section. Each pen will home (move downscale), and the display will blank (this could take as long as 20 seconds). The
display will show P1Lo.
With P1Lo displayed, Pen 1 will be positioned at the low end of the chart. Use UP or DOWN to position Pen 1, the red pen, on
the inner ring of the chart. Press SCROLL when done.
The display will now show P1Hi and the red pen will go to the outer ring of the chart. Again, use UP or DOWN to adjust the
pen. Press SCROLL when done.
If Pen 2 is included, the same process must be repeated for Pen 2, the green pen. After P2Hi is completed, depressing
SCROLL will return to PEn.
If Pen 2 is not included, press SCROLL twice to skip P2Lo and P2Hi calibration, and return to PEn.
PEN ARC MECHANICAL ADJUSTMENTS - ArC
Important Note:
Pen arc adjustments have been done at the factory and should not need to be done in the field, unless the pen arm
adjustments (mechanical) have been compromised. (This can happen if the pens are forcibly moved.)
Adjustments can be made at the bottom or top of span. In either position, the arm "length" can be adjusted by moving the pen
blade toward or away from the pivot point, but the pen tip should also line up with the inner or outer ring of the chart. The latter
is referred to as "position". Only the red pen can be adjusted to draw the correct arc. It is not mechanically possible for the
green pen to draw the correct arc if the red pen is adjusted to do so.
With Chrt in the display, press DOWN to enter the Chart calibration section and PEn will be displayed.