Ratings And Certifications; Sensor Location; Mounting The Enclosure - Oldham OLCT 200 User Manual

2.2 Ratings and Certifications

Wired Models
CSA certified for Division 1 & 2 hazardous area installations for explosion proof Class 1
Groups B,C,D, and intrinsically safe (OLCT 200/EC 2-wire loops only) Class 1 Groups
A,B,C,D. Also see sections 2.7, 2.7a & 2.8. Designed to meet CSA C22.2 No.152 for
Combustibles Monitors and ISA 92.0.01 Part 1 for Toxic Monitors.
Wireless Models
The enclosure is NRTL certified for Division 1 hazardous area installations for
explosion-proof Class 1 Groups B,C,D (see Figure 2-2c). The OLCT 200 is designed
to meet ISA 92.0.01 Part 1 for Toxic Monitors. The 10-0295 antenna fitting has an RP-
SMA connector and is suitable for Division 2 classified areas. An optional 1000-2193
antenna is also available for Division 1 classified areas. Figure 2-8 shows both
antenna styles.

2.3 Sensor Location

Factors such as air movement, gas density in relation to air, emission sources and
environmental variables affect correct sensor location. Air movement by fans,
prevailing winds and convection should be carefully evaluated to determine if a leak is
more likely to raise gas levels in certain areas within the facility. Vapor density of a gas
determines if it will rise or fall in air when there are no significant currents. Lighter than
air gases should have the monitors mounted 12 – 18 inches (30 – 45 centimeters)
above the potential gas leak and heavier than air gases should be this distance below.
Even though the OLCT 200 is designed for rugged service, sensors should be
protected from environmental damage from water, snow, shock, vibration and dirt.

2.4 Mounting the Enclosure

The OLCT 200 standard enclosure is a cast aluminum explosion-proof (NEMA 7)
enclosure as shown in Figure 2-2. Figure 2-2a shows dimensions with the dual local
sensor 'Y' included. Figure 2-2c shows the wireless model. For wireless models, the
wireless antenna should typically be mounted with "line of sight" access to the
controller's base station antenna. If a good "line of sight" angle is not possible the
OLCT 200 will usually still function properly at ranges up to 1500 feet but obstructions
should be kept to a minimum.
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