ENMET SPECTRUM-RAL-DC - Manual (Page 15)

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The initial calibration of a new sensor must be performed with the front cover of the enclosure removed.
A calibration cup is provided with the calibration kit. Follow the procedure for calibrating the
instrument as outlined in Section 3.1.3 of this manual with the following modification.
During the application of the span gas, the counter counts down from 120. When the counter
gets down to 30, adjust the potentiometer next to the display module on the instrument PC
board, so that the display to the right of the counter reads 0.65v. This is a one-time
adjustment to align the sensor output with the instrument electronics. It should only be
performed upon sensor replacement. All future calibrations should follow the procedure in
Section 3.1.3.
Replace the front cover on the instrument enclosure. Calibrate the instrument according to the
procedure in paragraph 3.1.3.
3.2.2 Battery Removal and replacement
Remove the front of the instrument. The battery is in a clip in the lower right of the enclosure. Remove
it, unclip the battery connector, replace with a 9 volt alkaline battery. Push the new battery into the clip
and replace the cover.
Two types of batteries are available for use with the SPECTRUM-DC-RAL: alkaline and rechargeable
Ni/MH. They have different end-of-life discharge characteristics. Either replace a battery with the
same type, or go to the "set BATT" portion of the maintenance menu, and select the new type being
used. See paragraph 3.1.5 to set battery type.
The rechargeable Ni/MH battery is of a common type which can be charged by a charger available at
any electronic store.
3.3 ENMET Part Numbers for Replacement Parts and Accessories
Description Part Number
Calibration Kit 03412-001
Calibration Gas, 20 ppm CO 03219-020
Zero Gas, 20.9 % Oxygen 03296-209
Replacement CO Sensor, for S/N 41-2106 and below 67020-1200
Replacement CO Sensor, for S/N 41-2150 and above 67016-1204
Display Assembly 62022-007
PC Board Assembly 05215-002
Battery, alkaline 67012-001
Battery, Ni/MH 67011-003
If the "set batt" selection is not identical with the battery being used, incorrect low battery indications
are furnished.