Fluid Components International GF90_GF92 - Manual (Page 72)

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GF Series Flow Meter Models GF90/GF92 68 Doc. No. 06EN003229 Rev. H
PIN
NUMBER
APPROXIMATE
RESISTANCE
1 to 2 0 Ohms
2 to 3 1000 Ohms*
2 to 4 1000 Ohms*
2 to 5 1000 Ohms*
2 to 6 1000 Ohms*
2 to 7 220 Ohms
2 to 8 220 Ohms
Check Serial Numbers
Verify that the serial number of the flow element and the flow transmitter are the same. The flow
element and the flow transmitter are a matched set and cannot be operated independently of each
other. The only exception is when the flow transmitter has been specifically configured to be a
replacement.
Check the Resistance of the Flow Element
Use Table 10 to determine if the flow element is wired incorrectly or has failed. Turn off the input
power to the transmitter. Unplug the flow element at JP3 located on the lower board and measure
resistances described below by touching the DMM test leads to the JP3 terminal screws. Plug JP3
is shown in Figure 35. The numbers in Figure 35 have been added to the wire designations for
discussion purposes and are not found on the JP3 terminal plug or wires. (Remember to reconnect
JP3 back to the flow transmitter when finished.)
NOTE: If the system does not allow the disconnection of the flowmeter power, or unplugging the
flow element, then proceed to the section, "In-Depth Troubleshooting - The Flow
Transmitter".
Be sure that pins 2 and 4 are jumpered on the terminal block located in the flow element (local)
enclosure (see Figure 36). All resistances in Table 10 are based on a temperature of 32°F (0 °C).
Resistances across the ACT and the REF RTDs for a GF90/92 are approximately 1080 ohms* and for
a GF90 high temperature are approximately 110 ohms* at 70 °F ( 21 °C ). The resistances will
continue to increase for higher temperatures at the flow element. Check resistance from each pin in
the local/remote enclosure to case ground. There should be an infinite resistance.
In-Depth
Troubleshooting
Standard
GF90/GF92
The Flow Element
Table 10.
Resistance at JP3
Terminal Plug (GF90/GF92)
Figure 35. JP3 Terminal Plug
*For the GF90 high temperature
flow element divide by 10.