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Summary of Contents for ENMET ISA-M
- Page 1 ENMET Corporation ENMET PO Box 979 Ann Arbor, MI 48106-0979 ISA – M ISA – M & M PERATION AINTENANCE ANUAL 80003-027 04/27/95 MCN-204, 10/20/98 MCN-285, 11/20/02...
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Page 2: Table Of Contents
Table of Contents 1.0 I ..........................1 NTRODUCTION 1.1 Unpack....................................1 1.2 Check Order..................................1 1.3 Serial Numbers .................................. 1 1.4 Read Manual..................................1 2.0 F ISA – M........................2 EATURES IF THE 2.1 External Feature of the ISA – M............................. 2 2.2 Internal Features of the ISA –... -
Page 3: Introduction
Notify ENMET customer service personnel of any discrepancy immediately. 1.3 Serial Numbers Each ISA – M is serialized. These numbers are on tags on the equipment and are on record in an ENMET database. 1.4 Read Manual... -
Page 4: Features If The Isa - M
2.0 Features if the ISA – M 2.0 Features if the 2.1 External Feature of the ISA – M Figure 1 shows the ISA-M control unit which contains the electronic circuitry and controls. Main features are listed below. Feature Description Meter This is a non-linear device. -
Page 5: Internal Features Of The Isa - M
ISA – M ENMET Corporation 2.2 Internal Features of the ISA – M Figure 2 shows the circuit board and terminal blocks housed inside the hinged oiltight control unit. Specific relays and adjustments are defined in the table below. Feature Description Internal Relay Contacts There is one relay for each alarm level. -
Page 6: Installation
AUTION electronics technician; but this change is best done at ENMET. 12 V may be used as a primary source (refer to Figure 2) or as an emergency back-up source, both ac and dc power can be applied at the same time. -
Page 7: Sensor Location
If you have a question involving the location of a unit or sensor, please contact your distributor or ENMET personnel. A technician will analyze the question and recommend a location. -
Page 8: Sensor Hook-Up
4.3 Sensor Hook-up The MOS sensor is connected to the ISA-M control unit with three conductor wiring, use the correct oiltight fitting. Two conductors supply heater current to the sensor. The third conductor is a signal wire. Size of heater wire depends on the distance between the particular sensor and the control unit. -
Page 9: Sensor Heater Voltage
ISA – M ENMET Corporation 4.4 Sensor Heater Voltage Heating the sensor promotes the oxidation reaction on the element surface. The temperature to which the sensor element is heated determines the selectivity of the equipment to certain gases. A chart, located inside the instrument front cover, specifies the voltage for the sensor. Units requiring purging have two voltages specified. -
Page 10: Operation
ENMET Corporation ISA – M 5.0 Operation 5.0 Operation Mount and install the ISA – M electronics unit and sensor as outlined in the previous section (4.0). : There is no ON/OFF switch on the unit. As a safety device, this unit is designed to be powered and ON at all times. -
Page 11: Routine Gas Test And Recalibration
OU NEED § Cylinder of high-level calibration gas with air used as background gas (for example 200 ppm CO in air) § Calibration fixture (with humidifier/regulator, plastic tubing and calibration cup); ENMET part # 03700-001 § Clean water § Small screwdriver... -
Page 12: To Recalibrate
ENMET Corporation ISA – M Table 5: Approximate Alarm Time Gas or Vapor Time to Alarm 20 ppm CO 5 - 7 minutes 50 ppm CO 5 minutes 200 ppm CO 2 minutes 10% LEL methane 1 minute 20% LEL methane... -
Page 13: Maintenance
Red alarm light stays on continuously, even Either hazardous gas conditions exist, or there is a contaminated sensor, or a bad circuit. Contact ENMET for voltage checks. after allowed to operate (or PURGED) overnight. -
Page 14: Replacement Part Numbers
Class I, Division I, Groups C and D atmosphere, as defined in the National Electrical l Code. Units for Group B are available upon special order. Do not use the standard ISA-M where you are required by the National Electrical Code or local codes to use an explosion-proof variety. -
Page 15: Warranty
9.0 WARRANTY 9.0 WARRANTY ENMET warrants new instruments to be free from defects in workmanship and material under normal use for a period of one year from date of shipment from ENMET. The warranty covers both parts and labor excluding instrument calibration and expendable parts such as calibration gas, filters, batteries, etc...
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