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

272-500-350 © 1996 (Rev. 8/00) Max Machinery, Inc. Page 5
INSTALLATION OF Model 272 TRANSMITTER
(Dimensions)
Electronic Protection: Diodes have been placed in the input and output circuits to guard against
excessive or reversed voltages in the event connections are made incorrectly. The diodes are
rated at 1/2 amp and will take one amp for a few seconds. If the sourcing current exceeds this
amount, the diodes will eventually fail, and damage to the transmitter may result.
Temperature Considerations: (continued)
The stator of the Model 272 transmitters is insulated with an epoxy that is rated to 125°C. This
limits the maximum flow meter fluid temperature to 130°C when using the Models 272-5X5 or
272-5X7. The 272-5X8 bidirectional transmitter uses Hall effect devices that are rated to 90°C.
This is the maximum fluid temperature when using the Model 272-5X8.
Transmitter Maximum Flow Meter Fluid Temperature
(Maximum: 65°C) @ Ambient of 50°C
272-5X5 130°C
272-5X7 130°C
272-5X8 90°C
The output of the Model 272 will be affected by changes in the temperature of the flow meter.
This is because the magnet that generates the voltage in the stator is affected slightly by
temperature. Fig. 4 shows typical percentages of error.
Discontinued