Instruction manual

RFT9739 Field-Mount Transmitter Instruction Manual 11
Output Wiring Startup TroubleshootingBefore You Begin Getting Started Mounting
Power-Supply and
Sensor Wiring
3 Transmitter Mounting
3.1 General guidelines
Follow these guidelines when installing the field-mount RFT9739
transmitter:
• Locate the transmitter where it is accessible for service and calibration.
• In hazardous areas, install the transmitter in a location that is specified
in
Section 2.1
, page 3.
• Total length of cable from the sensor to the transmitter must not exceed
1000 feet (300 meters).
• Locate the transmitter where the ambient temperature remains
between –22 and 131°F (–30 and 55°C). If the transmitter has a
display, the display might become difficult to read below 14°F (–10°C).
• Mount the transmitter to a stable, flat surface or instrument pole.
• The cover of the transmitter housing requires 11½ inches (292 mm)
clearance for removal. If the transmitter has a display, the cover
requires 13 3/16 inches (335 mm) clearance.
The base of the transmitter has three ¾-inch NPT female conduit
openings (see
Figure 3-1
, next page), which must remain sealed to
keep the transmitter watertight.
• Install conduit that allows a complete seal with the conduit openings.
• If possible, orient the transmitter with its conduit openings pointed
downward. If this is not possible, seal the conduit to prevent
condensation and other moisture from entering the housing.
• To comply with CENELEC standards for hazardous area installations in
Europe:
-
Use cable glands or conduit fittings rated flameproof for EEx d IIC
areas and certified by an authorized test station. Flameproof glands
supplied by Micro Motion meet these requirements.
-
Conduit openings that are not used should be sealed with blanking
plugs of type PLG 2.
-
For installation in a nonhazardous area, cable glands or conduit
fittings that do not carry a flameproof rating are acceptable.
• If the transmitter has a display, the display will be right-side-up only if
the transmitter is oriented with its conduit openings pointed downward.
CAUTION
Failure to seal transmitter housing could cause a
short circuit, which would result in measurement error
or flowmeter failure.
To avoid risk of condensation or excessive moisture
entering the transmitter housing, fully seal all conduit
openings when installing the transmitter.