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301/303/305/306/307 Flowmeters and Controllers Instruction Manual
Printed Circuit Board Replacement
NOTE: This instrument contains static sensitive PC boards. Maintain static protection when handling the
PC boards.
If any of the PC boards fail, they are easily removed from the instrument and replaced with a spare. It is
recommended that the metering printed circuit board and sensor be replaced as a unit because they are
electronically matched to optimize response time. This ease in disassembly and replacement
substantially reduces instrument downtime.
1. Replacement of the 4-20 mA option PC board: Unplug the power cable from the instrument's "D"
connector. Remove the fasteners and steel can. The 4-20 mA board is the PC board marked PC854 in the
lower left-hand corner just above the Teledyne logo. Remove the screws and lift off the 4-20 mA board.
Be careful not to damage the main board and 4-20 mA board connectors.
2. Replacement of the main PC board: Unplug the power cable from the instrument's "D" connector.
Remove the fasteners and steel can. Remove the 4 screws which fasten the main PC board to the sensor
module. Gently unplug the main board from the sensor (and from the 4-20 mA board, if present).
Sensor Replacement
Follow instructions for removing the PC board(s) as described in Section 3.4. Remove the 4 Allen head
cap screws that fasten the sensor to the main instrument base. Remove the sensor module from the
base, discarding the used nickel gaskets. New nickel gaskets are required for re-assembly, and the
unit must be recalibrated after the new sensor is installed.
To place an order or to obtain information concerning replacement parts, contact the factory
representative in your area. See the last page in this manual for the address or phone number. When
ordering, include the following information: Instrument model number, part description and Hastings
part number.
EAR99 Technology Subject to Restrictions Contained on the Cover Page
Page 25 of 32
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