Model 755R

Instruction Manual

748213-S April 2002

SECTION 2

INSTALLATION

2-1 FACILITY PREPARATION

Observe all precautions given in this section when installing the instrument.

a.Installation Drawings

For outline and mounting dimensions, gas connections, and other installation infor- mation, refer to Installation Drawing 654015 at the back of this manual.

b.Electrical Interconnection Diagram

Electrical interconnection is also shown in drawing 654015. Refer also to Section 2- 5, page 2-6.

c.Flow Diagram

The flow diagram of Figure 2-1 (page 2-3) shows connection of a typical gas selector manifold to the Model 755R.

d.Location and Mounting

Install the Model 755R only in a non-hazardous, weather-protected area. Permissible ambient temperature range is 32°F to 113°F (0°C to 45°C). Avoid mounting where ambient temperature may exceed the allowable maximum.

Magnetic susceptibilities and partial pres- sures of gases vary with temperature. In the Model 755R, temperature-induced readout error is avoided by control of temperatures in the following areas:

1.Interior of the analyzer is maintained at 140°F (60°C) by an electrically controlled heater and associated fan.

2.Immediately downstream from the inlet port, prior to entry into the de-

tector, the sample is preheated by passage through a coil maintained at approximately the same temperature as the detector (See Figure 4-3A, page 4-7).

3.The detector is maintained at a con- trolled temperature of 150°F (66°C).

Also, avoid excessive vibration. To minimize vibration effects, the detec- tor/magnet assembly is contained in a shock-mounted compartment.

WARNING

POSSIBLE EXPLOSION HAZARD

This analyzer is of a type capable of analysis of sample gases which may be flam- mable. If used for analysis of such gases, internal leakage of sample could result in an explosion causing death, personal in- jury, or property damage. Do not use this analyzer on flammable samples. Use explosion -proof version instruments for analysis of flammable samples.

Use reasonable precautions to avoid excessive vibration. In making electrical connections, do not allow any cable to touch the shock-mounted detector assembly or the associated internal sample inlet and outlet tubing. This precaution ensures against possible transmission of mechanical vibration through the cable to the detector, which could cause noisy readout.

Rosemount Analytical Inc. A Division of Emerson Process Management

Installation

2-1