9.2.2 Initial Observations
1. Verify the Hydran 201Ci-1’s display is not blank. If it remains blank, the possible
causes are as follows:
• If the fail alarm is triggered, read the alarm message on the Hydran 201Ti’s
display to identify the cause of the alarm. Then see Chapter 13.
• Verify the connections at both ends of the supervisory link cable.
• Verify the fuse(s) and the ac power supply of the H201Ci-1 and H201Ti.
• Verify the operation of the H201Ci-1’s display.
2. Verify the H201Ci-1’s display shows the same ppm value as the H201Ti’s scrolling
gas level display. A discrepancy of ± 2 ppm is acceptable.
3. Inside the H201Ci-1, verify the Supervisory Link Supply indicator (green, DS12;
item 17 in Figure 4-7) is lit.
4. Inside the H201Ci-1, look at the Heater indicator (yellow, DS8; item 13 in Figure 4-
7):
• The LED must initially be lit if the ambient temperature is below approximately
25°C (77°F).
• After a while, the LED must flash as the enclosure temperature reaches the
above set point.
• The LED must remain off if the ambient temperature exceeds the set point.
5. Since there are no alarm conditions present in the H201Ti, verify the following
points on the H201Ci-1:
• The Gas High alarm indicator of the door-mounted push-button 1 (item 2 in
Figure 4-5) is off.
• The Gas High-High alarm indicator of the door-mounted push-button 2 (item 2
in Figure 4-5) is off.
• The Alarm 1 (Gas High) indicator (yellow, DS10; item 15 in Figure 4-7) is off.
• The Alarm 2 (Gas High-High) indicator (yellow, DS9; item 14 in Figure 4-7) is off.
• The System OK indicator (yellow, DS11; item 16 in Figure 4-7) is lit.
9.2.3 Verifying the Analog Output
The Hydran 201Ci-1 is equipped with an isolated, analog 4–20 mA output. Table 5-7
lists the electrical currents that should be generated and the values that should be
displayed for each operation mode.
1. Proceed as follows: Connect a dc digital ammeter with 1% accuracy and a
0.01mA resolution to the main terminal block on the H201Ci-1 (item 6 in Figure
4-6).
2. Connect the positive lead on the pin 17 of the main terminal block.
3. Connect the negative lead on the pin 18 of the main terminal block.
4. On the Hydran 201Ti’s display, access the top of the extended menu by pushing
ENTER twice (History appears).
Note: Once accessed, the extended menu times out after 30 minutes of keypad inactivity.
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