5. Push DOWN six times until Relays/Analog appears.
6. Access this menu by pushing ENTER.
7. Push DOWN until TDM Pulse Out appears.
8. Push ENTER.
9. Push DOWN until TDM Out Mode appears.
10. Push ENTER. The value should be Normal.
11. Modify the TDM Out Mode by pushing CHANGE.
12. When asked to enter the password #1 (1253), use the UP, DOWN and ENTER keys.
13. Use the UP, DOWN and ENTER keys to force the output to 0%.
14. Allow about one minute for the output to stabilize.
15. Verify the H201Ci-1’s display reads 0 ± 2ppm.
16. Verify the ammeter reads 4.00 ± 0.10mA.
17. Use the UP, DOWN and ENTER keys to force the output to 50%.
18. Allow about one minute for the output to stabilize.
19. Verify the H201Ci-1’s display reads 1000 ± 5ppm.
20. Verify the ammeter reads 12.00 ± 0.20mA.
21. Use the UP, DOWN and ENTER keys to force the output to 100%.
22. Allow about one minute for the output to stabilize.
23. Verify the H201Ci-1’s display reads 1999 ppm.
Note: The maximum value of the Hydran 201Ci- 1’s display scale is 1999ppm. If the
signal is over scale, the display indicates 1... when the operation mode is set to Force
100%.
24. Verify the ammeter reads 20.00 ± 0.40mA.
25. Use the UP, DOWN and ENTER keys to force the output to Off.
26. Verify that:
• The H201Ci-1’s display is blank.
• The analog output drops to 0.00 ± 0.10 mA.
• The System OK indicator (yellow, DS11; item 16 in Figure 4-7) is off.
27. Use the UP, DOWN and ENTER keys to return the output to Normal.
28. Verify the signal of the analog output returns to its former value.
29. When all is done, push END.
30. Disconnect the ammeter.
9.2.4 Verifying the Alarm Indicators and Relays
The steps described in this Section may be used during the Hydran 201Ci-1
verification, maintenance and troubleshooting procedures; certain steps may therefore
not apply to your particular situation. Perform all procedures (from Section 9.2.4.1 to
Section 9.2.4.6.
The alarm relays are verified by observing the LED’s on the H201C i-1’s circuit board
and by connecting an ohmmeter to the main terminal block on the H201Ci-1 (item 6 in
Figure 4-6).
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