Teledyne 2120 - Trace Nitrogen in Argon Analyzer - Manual (Page 53)

Trace Nitrogen in Argon Analyzer Maintenance
To change the selected line voltage, follow the steps outlined below
while referring to Figure 5-1.
1. Ensure the AC power cord is disconnected from the unit. Then
open the hinged cover to the power entry module as described
above.
2. Remove the fuse assembly.
3. Check for the proper fuse (2 amp, 250 V fuse for 110 VAC; 1
amp, 250 V fuse for 230 VAC) and replace if necessary.
CAUTION: EXCESSIVE CURRENT THROUGH THE ANALYZER
CAN RESULT IN EQUIPMENT DAMAGE. BE SURE
THE PROPER FUSE IS IN PLACE FOR THE
SELECTED VOLTAGE BEFORE APPLYING POWER
TO THE ANALYZER.
4. Turn the fuse assembly so that the selected voltage is right side
up and shows through the voltage selection window of the
power entry module.
5. Replace the fuse cartridge in the power entry module.
6. Close the power entry module hinged cover.
7. Check to see that the proper line voltage displays in the voltage
selection window.
5.4.2 Optical Filter
CAUTION: DO NOT TOUCH THE FACES OF THE OPTICAL
FILTER. OIL FROM THE SKIN AFFECTS THE
OPTICAL CHARACTERISTICS.
The optical filter is located beneath the PMT cover. Perform the
following steps to clean the filter:
1. Ensure the AC power cord is disconnected from the unit. The
optical filter fits into the window opening of the PMT cover and
will fall away from the PMT when the cover is removed.
2. Remove the PMT cover and optical filter, carefully catching the
optical filter with a gloved hand. One side of the 25-mm
diameter filter is dark and the other side is mirror-like. The
Teledyne Analytical Instruments
43