Lake Shore Model 218 Temperature Monitor User’s Manual
Service
7-3
7.5 FUSE
REPLACEMENT
Use the following procedure to remove and replace a line fuse.
WARNING: To avoid potentially lethal shocks, turn off controller and disconnect it from
AC power before performing these procedures.
CAUTION:
For continued protection against fire hazard, replace only with the same fuse type
and rating specified for the line for the line voltage selected.
NOTE:
Test fuse with an ohmmeter. Do not rely on visual inspection of fuse.
1. Locate line input assembly on the instrument rear panel. See Figure 7-2.
2. Turn power switch Off (
O
).
3. Remove instrument power cord.
4. With a small screwdriver, release the drawer holding the line voltage selector and fuses.
5. Remove and discard both existing fuses. Replace with proper Slow-Blow (time-delay) fuse ratings
as follows:
100/120 V 0.25 A T 250 V
5
×
20 mm
220/240 V 0.25 A T 250 V
5
×
20 mm
6. Re-assemble line input assembly in reverse order.
7. Verify voltage indicator in the line input assembly window.
8. Connect instrument power cord.
9. Turn power switch On (
l
).
7.6 SENSOR INPUT CONNECTOR AND PINOUT
F-218-7-3.bmp
PIN DESC. PIN DESC. PIN DESC. PIN DESC.
Input Connector (Inputs 1-4)
Input Connector (Inputs 5-8)
1 NC
1 NC
2 S 14 S 2 S 14 S
3 1I+ 15 1I– 3 5I+ 15 5I–
4 1V+ 16 1V- 4 5V+ 16 5V–
5 S 17 S 5 S 17 S
6 2I+ 18 2I– 6 6I+ 18 6I–
7 2V+ 19 2V- 7 6V+ 19 6V–
8 S 20 S 8 S 20 S
9 3I+ 21 3I– 9 7I+ 21 7I–
10 3V+ 22 3V- 10 7V+ 22 7V–
11 S 23 S 11 S 23 S
12 4I+ 24 4I– 12 8I+ 24 8I–
13 4V+ 25 4V- 13 8V+ 25 8V-
Figure 7-3. Model 218 Input Connector Pinouts (S = Shield, NC = No Connect)