Envent 330S-Ex, User Manual, Page: 38 / 71

Envent Engineering Ltd. Page 33 Revision 1
11. To adjust the gain setting such that the analyzer displays the correct H
2
S
concentration, press the right [→] and / or left [←] arrows until the cursor
is underneath the number you wish to change.
12. Adjust the number using the "Menu/Set" button (it will increase until "9"
then will cycle back through "0").
13. Save the new gain value by pressing the right arrow [→] until "Saved"
appears or discard by pressing the left [←] arrow until "Cancel" appears.
14. Allow the analyzer to complete two cycles using the new gain value. The
H
2
S reading should match the calibration gas concentration. Repeat step
10 if necessary.
15. Return to sample gas flow using the 3-way calibration valve.
16. Set the sample gas pressure to 15 psig and set the flow meter to 2.0.
17. Disconnect the calibration gas supply.
18. After waiting 10 to 15 minutes confirm the analyzer reads below the H
2
S
alarm set points.
Remove the analyzer from bypass mode by pressing the bypass button.
Verify the "Bypass" LED turns off.
Alarms are armed after removing the bypass mode.
Re-zero Sensor Procedure
1. Press the bypass button and verify that the "Bypass" LED illuminates.
2. Turn off sample gas flow using sample inlet valve.
3. Press the "Menu/Set" button until "Mtr Run" is displayed. Press the right
arrow [→], the H
2
S sensing tape will advance for approximately 10
seconds.
4. Remove the sensor cover.
5. Press the small pushbutton on the sensor block located on the lower left
side next to the wire connector.
• The sensor block will implement a "re-zero" procedure, indicated by
a lit, red LED.
• When the "re-zero" procedure is complete the LED light will turn
green.
6. Initiate another motor run (Step 3).
7. Press the "Menu/Set" button until "### mV" is displayed.
•
Value should be 1000mV (+100mV)
8. Put on sensor cover.
9. Turn on sample gas flow using sample inlet valve.
10. Set the gas pressure to 15 psig and the flow meter to 2.0.