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ENMET ISA-40 Series Скачать руководство пользователя страница 14

ENMET

Corporation

ISA-40 Oxygen Monitor

12

5.0 Maintenance

5.0 Maintenance

5.1 Cell Aging

The output of the cell decreases with cell usage. The change is very small during the operational life of the cell, 12 –
14 months, and is compensated by changing the gain to cause the meter reading to be 20.9% in fresh air. Gain reset
and rough test (Sections 3.2.3 and 4.1) should be accomplished every 4 – 6 weeks.

N

OTE

:

When adjusting the gain, if the air at the sensor locations is suspected to be depleted in oxygen.. Use cylinders

of 20.9% by volume oxygen in nitrogen if necessary to guarantee oxygen content, see Section 7.1.

5.2 Cell End-of-Life

When the electrodes in the transducer cell are finally depleted, the cell output terminates rather quickly. The first
indication that this is occurring is generally an inability to adjust the gain to yield a 20.9% reading in fresh air. Then
the cell output decreases until the channel is constantly in alarm. To install a new cell, follow the procedures given in
sections 3.2.1 and 3.2.3. If installing a cell in a remote sensor assembly with audio alarm, disconnect the ground side
of the sensor assembly audio alarm during this process to avoid spurious alarms while changing the cell; reconnect it
when done.

5.3 Circuit Alignment

Each

ISA-40

system is aligned at the factory; however, due to prolonged use, oxygen cell replacement and assorted

other circumstances, it may become necessary to realign the circuitry. If the unit is in constant alarm, the oxygen
micro fuel cell has probably expired. Proceed to the cell replacement section 5.2, then come back to this one. The
procedure for realignment is not difficult, but be aware that any deviation from the procedure described below voids
the warranty. If you have any doubts about the procedure, contact

ENMET

personnel.

The only tools necessary are a digital voltmeter and a small screwdriver. This procedure is given for an S-2 oxygen
cell,

ENMET

P/N 67013-008 as furnished as a replacement cell; this cell has a grey label. Refer to Figure 7 for test

point and potentiometer locations.

Edge view of Circuit Board

Interior view of 4 channel

ISA-40

Figure 7: Location of Circuit Boards, Test points and Potentiometers

Channel 3 & 4
Circuit Board

Channel 1 & 2
Circuit Board

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Содержание ISA-40 Series

Страница 1: ...ENMET ENMET Corporation PO Box 979 Ann Arbor MI 48106 0979 80015 001 12 05 91 MCN 204 01 19 99 MCN 277 07 01 02 ISA 40 ISA 40 Oxygen Monitor Oxygen Monitor Manual ...

Страница 2: ...nt 12 5 4 Circuit Breakers Fuse 14 6 0 ISA 40 SPECIFICATIONS 15 7 0 SERVICE INFORMATION 15 7 1 Replacement Part Numbers 15 7 2 Return for Repair 16 8 0 WARRANTY 17 List of Illustrations FIGURE 1 ISA 40 CONTROL UNIT EXTERIOR 2 FIGURE 2 MOUNTING DIMENSIONS 3 TABLE 1 POWER SUPPLY WIRING 3 FIGURE 3 OXYGEN CELL INSTALLATION 5 TABLE 2 REMOTE SENSOR ASSEMBLY WIRING WITHOUT INTRINSIC SAFETY BARRIER 6 TABL...

Страница 3: ...ange without notice 1 1 Unpack Unpack the ISA 40 and examine it for shipping damage If such damage is observed notify both ENMET customer service personnel and the commercial carrier involved immediately Regarding Damaged Shipments NOTE It is your responsibility to follow these instructions If they are not followed the carrier will not honor any claims for damage q This shipment was carefully insp...

Страница 4: ...e unit is in high alarm Lamp Green When this light is on the unit is operating and is not in alarm When this light is off the unit is in alarm OR power to the unit has been interrupted Switch Audio Alarm Switch to disable audio alarm horn on off Indicator Audio Alarm Light Amber When this light is on the audio alarm is disabled Relay Reset Button Push button to release latching relay Figure 1 ISA ...

Страница 5: ...nting the electronics control unit See Figure 2 for mounting dimensions NOTE All dimensions are given in inches 2 Apply 110 VAC and or 12 VDC power to the appropriate terminals on TB5 and TB3 Refer to the Wiring Information table Both 110 VAC and 12 VDC power can be applied together the 12 VDC is standby power source DC current will flow only when the AC power is interrupted Table 1 Power Supply W...

Страница 6: ...oldering iron 18 gauge or larger insulated wire and 60 tin 40 lead resin sore solder CAUTION This procedure should be performed only by personnel with electrical repair experience 1 Disconnect power from control unit 2 Remove instrument circuit board to access transformer standoffs on motherboard 3 Unscrew the cover retaining screw and rotate protective standoff cover until standoffs are exposed 4...

Страница 7: ...he control unit and remove screws to remove cell circuit board See Figure 1 3 2 Carefully remove the cell from the package 3 Remove the metal shorting clip or spring from cell pins See Figure 3 4 Plug the cell into the component side of the cell circuit board center pin to center hole See Figure 3 Place the board in the enclosure and replace the screws to secure the cell and circuit board 5 Wait a...

Страница 8: ...2 Audio Alarm TB1 2 Horn TBS 2 2 Oxygen Cell TB1 2 O2 TBS 3 2 Oxygen Cell TB1 2 O2 TBS 4 3 Audio Alarm TB4 1 TBS 1 3 Audio Alarm TB2 3 Horn TBS 2 3 Oxygen Cell TB2 3 O2 TBS 3 3 Oxygen Cell TB2 3 O2 TBS 4 4 Audio Alarm TB4 2 TBS 1 4 Audio Alarm TB2 4 Horn TBS 2 4 Oxygen Cell TB2 4 O2 TBS 3 4 Oxygen Cell TB2 4 O2 TBS 4 Table 2A Remote Sensor Assembly Wiring with Intrinsic Safety Barrier Channel Sign...

Страница 9: ...ing Clip or Spring Bottom View O2 Sensor Center Pin Negative Outer Pin Positive O2 Cell Circuit Board w cell installed on circuit side O2 Cell TB4 TB2 TB1 TB3 T B 3 T B 4 T B 2 T B 1 T B 5 TB7 ISA 40 Interior View Optional Intrinsic Safety Barriers Detailed View Intrinsic Safety Barriers Example Channel 1 ISB installed IS1 1 IS1 2 IS1 3 ...

Страница 10: ...ing clip or spring from the cell See Figure 4 8 Plug the cell into the component side of the cell circuit board in the oxygen sensor assembly insert the center pin of the cell into the center hole of the circuit board Place the cell in position in the top of the assembly enclosure and replace the screws to secure the cell in place CAUTION Do not tighten screws too much doing so can damage the comp...

Страница 11: ...junction between the oxygen cell and the sensor connection o the ISA 40 motherboard See the wiring information Table 2A and Figure 4 3 3 Relay Outputs Relay contacts can be used to activate other alarm signals or equipment away from the control unit enclosure when there is an alarm condition and when the AC or DC power is interrupted The contacts supplied are dry with a rating of 2 Amp continuous ...

Страница 12: ... 4 TB4 4COM Common 3 3 2 Latching Relays Latching relays are available on TB7 the terminal strip located on the auxiliary relay circuit assembly located on the upper surface of the control unit enclosure These relays once triggered by an alarm condition remain latched in the alarm position until released by an operator who activates the relay release pushbutton switch on the front of the enclosure...

Страница 13: ... adjust the oxygen cell in an area where an oxygen deficiency may exist Always adjust the oxygen cell in fresh air Use cylinders of 20 9 by volume oxygen in nitrogen if necessary to guarantee oxygen content See Section 7 1 Avoid exposure to toxic gas environments 4 3 Atmospheric Pressure Variations The galvanic oxygen deficiency transducer cell current output is directly proportional to the partia...

Страница 14: ...installing a cell in a remote sensor assembly with audio alarm disconnect the ground side of the sensor assembly audio alarm during this process to avoid spurious alarms while changing the cell reconnect it when done 5 3 Circuit Alignment Each ISA 40 system is aligned at the factory however due to prolonged use oxygen cell replacement and assorted other circumstances it may become necessary to rea...

Страница 15: ...re 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...

Страница 16: ...led 20 9 by volume oxygen to the sensor for a couple of minutes then adjust gain e If possible exhale all your breath over the oxygen cell The meter reading should drop and the oxygen alarm should come on at the predetermined alarm point usually 18 0 oxygen by volume f If the oxygen alarm does not come on at this point repeat the entire procedure checking terminal connections test points and volta...

Страница 17: ...Range 32 F to 125 F ENMET Warranty 6 months form shipment Size 1 25 diameter by 0 80 long Weight 26 grams Expected Life Up to 14 months in air NOTE All specifications stated in this manual may change without notice 7 0 Service Information 7 0 Service Information 7 1 Replacement Part Numbers A full set of replacement part numbers and prices are a part of the documentation which accompanied the orde...

Страница 18: ... information can result in processing delays ENMET charges a one hour minimum billing for all approved repairs with additional time billed to the closest tenth of an hour All instruments sent to ENMET are subject to a minimum 30 evaluation fee even if returned unrepaired Unclaimed instruments that ENMET has received without appropriate paperwork or attempts to advise repair costs that have been un...

Страница 19: ...nt mode ENMET shall not be liable for any loss or damage caused by the improper use of the product The purchaser indemnifies and saves harmless the company with respect to any loss or damages that may arise through the use by the purchaser or others of this equipment This warranty is expressly given in lieu of all other warranties either expressed or implied including that of merchantability and a...

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