Max Machinery 272-5X8 BIDIRECTIONAL TRANSMITTER (210_240 SERIES FLOW METERS) - Manual (Page 4)

INSTALLATION OF Model 272 TRANSMITTER
(Mounting, Protection)
Mounting: The Model 272 transmitter screws on and off of the flow meter. Because of the
random location of the starting point of the threads, one transmitter will probably not line up
with the “in” and “out” ports of the flow meter like another will. The electrical outlet of the
transmitter can be rotated clockwise or counter clockwise one turn by loosening the clamp-
ing screw at the base of the transmitter housing.
Two flats are provided for screwing the transmitter on to the flow meter. Care should be
taken when slipping the transmitter on and off. The wire of the stator is fine gauge and is
easily damaged.
Moisture Protection: The weather tight version of the transmitter has its electronic
circuitry enclosed in a liquid and vapor tight enclosure. All joints are sealed by welding or
by “O”-rings. If this sealed condition is to be maintained, the conduit connection to the
enclosure should be made liquid and vapor tight by using pipe dope or a potting fitting. If a
transmitter is located outside and this precaution is not taken, moisture may form inside the
housing. This will cause the circuitry to give an inaccurate output or possibly no output at
all. In the long run it will cause corrosion and failure. The amphenol connector 272 Models
offer moderate protection from moisture and dust, but are not totally sealed.
Temperature Considerations: High ambient temperatures (120°F/50°C) should be avoided if
possible. It is a good idea to locate the transmitter away from hot spots such as steam pipes,
ovens and heaters. The electronics of the 272 Series Transmitters are rated for operation up
to 65°C or 150°F. Because some heat travels from the flow meter to the transmitter
electrical enclosure, the temperature the electronics see is a function of both the
ambient and the flow meter temperature. Figure 3 shows the relationship between the
aximum ambient transmitter temperature and the fluid temperature through the flow meter.
Page 4 272-500-350 © 1996 (Rev. 8/00) Max Machinery, Inc.
Discontinued