Michell Instruments Promet I.S., Руководство пользователя

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Promet I.S. User’s Manual
Michell Instruments 13
INSTALLATION
b. The dew-point transmitter has a 5/8” UNF parallel mounting thread which
should be installed directly into the sampling block with the bonded
seal provided. The bonded seal provided should be placed over
the transmitter mounting thread before it is screwed into the
sampling block.
c. Finger tighten the dew-point transmitter by gripping the spanner/wrench
fl ats on the body - NOT the transmitter body cover. Completely tighten
using a spanner/wrench until the bonded seal is fully compressed to a
minimum torque of 30.5 Nm (22.5 lbf-ft).
d. The pressure transmitter has a 1/8” NPT thread. It can be installed into
the 1/8” NPTF port on the sensor block. Follow the standard Swagelok
®
installation instructions to make the connection.
To install the complete Promet I.S. sensor assembly into the sampling system, follow
these steps:
a. Select a location to mount the sensor assembly which has suf fi cient
clearance for connecting and disconnecting the inlet/outlet tubing and
cable. The surface should be strong enough to hold the analyzer.
b. Mount the Promet I.S. sensor assembly into the sampling system via its
two mounting holes.
c. Sample gas connections are made via the gas inlet and gas outlet ports as
shown in
Figure 7. Both the gas inlet and outlet port are 1/8” NPT female
ports. Michell recommends using Swagelok
®
6mm to 1/8” NPT (ordering
code SS-6M0-1-2) or 1/4” to 1/8” NPT (ordering code SS-400-1-2) male
connectors to connect these two ports to the 6mm or 1/4” sampling
system tubing. Follow standard Swagelok
®
installation instructions to
make the connections.
d. The sensor assembly will then be supported by the tubings connecting
to it.
Although the operation of the Easidew PRO I.S. dew-point transmitter is not sample
fl ow-rate dependant, it is important to ensure that the fl ow velocity through the sample
line to the sampling block is high enough to avoid long time lags in response to changes
in moisture at the sample source. Michell recommends that a fl ow-rate of 1 to 5 Nl/min
(2.1 to 10.6 scfh) (or equivalent at pressure) be set and that the dew-point transmitter
is mounted as close as practicably possible to the sample source.