Dwyer 3100MP - Manual (Page 6)

Page 5
2.1 Unpacking Transmitters
When moving the transmitter to the installation site, keep it in the
original packaging. Unpack the transmitter at the installation site to
avoid damage on the way.
2.2 Model and Specifications Check
The model number and specifications are indicated on the
nameplate. Please check the specification and model number.
2.3 Storage
The following precautions must be observed when storing the
instrument, especially for a long period of time.
1. Select a storage area that meets the following conditions:
- is not exposed to rain or water.
- minimal vibration and shock.
- stored at normal temperature and humidity
(approx. 77°F (25°C), 65% RH).
The ambient temperature and relative humidity ratings are:
Ambient Temperature: -40 to 185°F (-40 to 85°C)
(without LCD module)
-22 to 176°F (-30 to 80°C)
(with LCD module)
General Use: -4 to 140°F (-20 to 60°C)
Relative Humidity: 5% ~ 98% RH at 104°F (40°C)
2. When storing the transmitter, repack it the way it was
delivered from the factory.
3. If storing a used transmitter, thoroughly clean the diaphragm
surfaces, so that no media remains. Make sure the transmitter
assemblies are securely mounted before storing.
2.4 Selecting Installation Locations
The transmitter is designed to withstand severe environmental
conditions. However, to ensure stable and accurate operation, the
following precautions must be observed when selecting an
installation location.
1. Ambient Temperature
Avoid locations subject to wide temperature variations or a
significant temperature gradient. If the location is exposed to
radiant heat from plant equipment, provide adequate
insulation or ventilation.
2. Ambient Atmosphere
Avoid installing the transmitter in a corrosive atmosphere. If
the transmitter must be installed in a corrosive atmosphere,
there must be adequate ventilation. Precautions must be put
into place to prevent intrusion or stagnation of rainwater in
conduits.
3. Shock and Vibration
Select an installation site with minimum shock and vibration
(although the transmitter is designed to be relatively
resistant to shock and vibration).
4. Installation of Explosion-Proof Transmitters
Explosion-Proof transmitters can be installed in hazardous
areas according to the gas types for which they are certified.
5. Select a place where the transmitter can be maintenanced
easily.
2.5 Calibration after Installation
1. Sensor Zero Trim should be done after transmitter is installed,
because the zero point is not configured for mounting status.
2. When calibrating the Sensor Zero Trim apply a pressure for zero
in advance, Sensor Zero Trim the sensor when the pressure is
sufficiently stabilized (after approximately 10 seconds).
3. There are two ways to pressure zero. One way is to apply zero
differential pressure (making pressure the same on both the high
and low side). The other is to close High and Low side of a 3
valve manifold and open the equalizing valve.
4. Sensor Zero Trimming can also be done with the Zero/Span
button or a HHT (HART ® Communicator), PC or PDA
configurator.
5. Refer to On-line Operation for configuring other parameters.
2.6 Pressure Connections
The following precautions must be observed in order to safely
operate the transmitter under pressure.
1. Never apply a pressure higher than the specified maximum
working pressure.
2. Confirm the option pressure of transmitter. It is necessary to
use standardized and quality-approved parts.
3. There should be isolation valves in case of leakage.
2.7 Waterproofing Cable Conduit Connections
Apply a non-hardening sealant (silicone or tape, etc.) to the threads
to waterproof the transmitter cable conduit connections.
2.8 Restrictions on Use of Radio Transceivers
2.9 Installation Resistance Test and Dielectric Strength Test
Since the transmitter has undergone insulation resistance and
dielectric strength tests at the factory, normally these tests are not
required. However, if required, observe the following precautions in
the test procedures.
1. Do not perform such tests more frequently than necessary.
Even test voltages, that do not cause visible damage to the
insulation, may degrade the insulation and reduce safety
margins.
2. Never apply a voltage exceeding 500VDC for the insulation
resistance test, or a voltage exceeding 500VAC for the
dielectric strength test.
3. Before conducting these tests, disconnect all signal lines from
the transmitter terminals. Perform the tests in the following
procedures.
Insulation Resistance test
1. Short-circuit the + and - SUPPLY terminals in the terminal
box.
2. Turn OFF the insulation tester. Then connect the
insulation tester plus (+) lead-wire to the shorted SUPPLY
terminals and the minus (-) lead wire to the grounding
terminal.
3. Turn ON the insulation tester power and measure the
insulation resistance. The voltage should be applied briefly
to verify that insulation resistance is at least 20MΩ.
Although the transmitter has been designed to resist high
frequency electrical noise, if a radio transceiver is used near the
transmitters external wiring, the transmitter may be affected by high frequency
noise pickup. To test for such effects, bring the transceiver in slowly from a distance
of several feet from the transmitter, and observe the measurement loop for noise
affects. Always use the transceiver outside the area affected by noise.
WARNING
Instrument installed in the process under pressure.
Never loosen or tighten as it may cause dangerous spouting of
process fluid. If the process fluid is toxic or otherwise harmful, take appropriate care
to avoid contact or inhalation of vapors even after disconnecting the instrument from
process line for maintenance.
CAUTION