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TXP-WTA_Instruction_Manual_(Rev1.3)
5 Installation Instructions
5.1 Ratings and Certifications
The enclosure is NRTL (Nationally Recognized Testing Laboratory) certified for Division 1 hazardous area installations
for explosion-proof Class 1 Groups A, B, C, D (see Figure 4-1). The TXP-WTA Sensor Transmitter is designed to meet
ISA 92.0.01 Part 1 for Toxic Monitors. The standard antenna fitting has an RP-TNC connector and is suitable for
Division 2 classified areas. An optional explosion-proof dipole antenna is also available for Division 1 classified areas.
Figure 4-2 shows both antenna styles.
5.2 Sensor Location
Correct sensor location can be affected by factors such as:
•
Air Movement - 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.
•
Gas Density in Relation to Air - Vapor density of a gas determines if it will rise or fall in air when there are no
significant currents.
Personnel Traffic
•
•
Emission Sources
Environmental Variables
•
NOTE: Lighter than air gases should have the TXP-WTA Sensor Transmitters mounted 12-18 inches (30-45
centimeters) above the potential gas leak and heavier than air gases should be this distance below.
NOTE: Even though TXP-WTA Sensor Transmitters are designed for rugged service and harsh environments, they
should be protected against unnecessary environmental damage from water, snow, shock, vibration and dirt.
5.3 Mounting the Enclosure
Standard enclosures of TXP-WTA Sensor Transmitters are cast aluminum explosion-proof (NEMA 7), as shown in
Figure 4-1, and the polycarbonate enclosure shown in Figure 4-2. Modular design simplifies the installation of the
TXP-WTA Sensor Transmitter. The TXP-WTA Sensor Transmitter antenna should typically be mounted with line-of-
site access to the controller and/or WAR antenna(s). If a quality line-of-site angle is not possible, the TXP-WTA
Sensor Transmitter will usually still function properly at the following ranges–however, obstructions should still be
kept to a minimum.
•
2.4 GHz frequency range: 2400 - 2483.5 MHz with 42 hops
2.4 GHz indoor/urban range: Up to 1500 feet with 7dBi collinear antenna
•
•
2.4 GHz outdoor RF LOS range: Up to two miles with high-gain antenna
•
900 MHz frequency range: 902 - 928 MHz with 50 hops
900 MHz indoor/urban range: Up to 3000 feet with 2dBi dipole antenna
•
WARNING: QUALIFIED PERSONNEL SHOULD PERFORM THE INSTALLATION ACCORDING TO APPLICABLE ELECTRICAL
CODES, REGULATIONS AND SAFETY STANDARDS. ENSURE CORRECT CABLING AND SEALING FITTING PRACTICES ARE
IMPLEMENTED. INSTALL THE
SENSOR TRANSMITTER TO A WALL OR BRACKET USING THE PRE-DRILLED MOUNTING FLANGES WITH I.D. 0.3 ON 5.0'
CENTERS (SEE FIGURE 4-1)
CAUTION: THE SENSOR ELEMENT SHOULD NEVER BE INSTALLED POINTING UPWARD.
REV – 1.3
[34-2900-0207-4 ]
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