Enmet ISA-40M Manuel d'utilisateur télécharger pdf (Page 14)

ENMET Corporation ISA-40M Oxygen Monitor

1. Null adjust:

a) Disconnect the oxygen cell from the circuit by disconnecting leads at TB1 or TB2 as shown below:

Channel Disconnect Terminal Positions

1 TB1 – 1 O2 (+) and TB1 – 1 O2 (–)

2 TB1 – 2 O2 (+) and TB1 – 2 O2 (–)

3 TB2 – 3 O2 (+) and TB2 – 3 O2 (–)

4 TB2 – 4 O2 (+) and TB2 – 4 O2 (–)

b) Check the null voltage for the channel. Connect the voltmeter leads to the appropriate test points, shown below:

Channel Test points On Circuit Board

1 TP101 (–), TP102 (+) For channel(s) 1 (and 2)

2 TP201 (–), TP202 (+) For channels 1 and 2

3 TP101 (–), TP102 (+) For channel(s) 3 (and 4)

4 TP201 (–), TP202 (+) For channels 3 and 4

c) Adjust the appropriate null adjust potentiometer, shown below, so the voltage between the points is 0.00 VDC:

Channel Potentiometer On Circuit Board

1 R108 For channel(s) 1 (and 2)

2 R208 For channels 1 and 2

3 R108 For channel(s) 3 (and 4)

4 R208 For channels 3 and 4

2. Low Level Set Adjust:

a) Reconnect the oxygen cell by reconnecting the leads removed in step 2 a).

b) Make sure the oxygen cell is properly connected by measuring the voltage between the cell leads; this voltage

must be between 0.043 and 0.09 VDC.

c) Measure the Low Level Set voltage for the channel by connecting the voltmeter leads to the appropriate test

points, shown below:

Channel Test point On Circuit Board

1 TP101 (–), TP103 (+) For channel(s) 1 (and 2)

2 TP201 (–), TP203 (+) For channels 1 and 2

3 TP101 (–), TP103 (+) For channel(s) 3 (and 4)

4 TP201 (–), TP203 (+) For channels 3 and 4

d) Adjust appropriate low level set potentiometer, R112 or R212, so the voltage between the test points is 1.03 VDC.

Channel Potentiometer On Circuit Board

1 R112 For channel(s) 1 (and 2)

2 R212 For channels 1 and 2

3 R112 For channel(s) 3 (and 4)

4 R212 For channels 3 and 4

3. Full Scale Adjustment:

a) Place voltmeter leads at the appropriate positions, shown below, to adjust the full scale voltage:

Channel Test point On Circuit Board

1 TP101 (–), TP102 (+) For channel(s) 1 (and 2)

2 TP201 (–), TP202 (+) For channels 1 and 2

3 TP101 (–), TP102 (+) For channel(s) 3 (and 4)

4 TP201 (–), TP202 (+) For channels 3 and 4

b) Adjust the appropriate oxygen gain potentiometer on the front panel of the control unit so the voltage between

the test points is 1.55 VDC.

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Enmet ISA-40M Manuel d'utilisateur Page 14

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