Emerson NGA 2000 TO2 Leak Test, Sensor Damage, Electrical Connections Electrical Shock Hazard

Model NGA 2000 TO2

Instruction Manual

760008-A September 2001

a.Leak Test

The TO2 Analyzer Module is completely tested at the factory for gas leakage. The user is responsible for testing for leakage only at the inlet and outlet fittings on the rear panel.

CAUTION.

SENSOR DAMAGE

Do not expose the Sensor to pressure in excess of 1.0 psig as this may cause dam- age.

Flow Indicator Method

Supply air or inert gas such as nitrogen, at 1 psig (6.8 hPa), to the analyzer through a flow indicator with a range of 0 to 250 cc/min. Install a shut-off valve at the sample gas outlet. Set the flow rate to 125 cc/min.

Close the outlet shut-off valve and notice that the flow reading drops to zero. If the flow reading does not drop to zero, the system is leaking and must be corrected before the introduction of sample gas or the application of power.

2-6 ELECTRICAL CONNECTIONS

WARNING.

ELECTRICAL SHOCK HAZARD

Operate this equipment only when covers are secured. Servicing re- quires access to live parts which can cause death or serious injury. Refer servicing to qualified personnel. For safety and proper performance, this module must be connected to a properly grounded three-wire source of electrical power.

Electrical connections must be made in compliance with National Electri- cal Code (ANSI/NFPA 70) and/or any applicable national or electrical codes.

Two electrical connections are required on the Analyzer Module: POWER and NETWORK (See Figure 2-4). On the Analyzer Module, two NETWORK connectors are available, ei- ther of which is appropriate for: 1) intercon- nection with the Backplane of the Platform or

2)"daisy-chaining" with other NGA 2000 components (A star connection is acceptable for LON lengths under about 10 meters.)

Connect a source of 24 V 5A DC power to the power inlet. Make sure that the ground con- nection is made, and that this is separate from the power return lead. Failure to ensure a good ground may result in random noise and disturbance in the analyzer readings.

Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-3