Fluid Components International GF90_GF92 - Manual (Page 75)

Doc. No. 06EN003229 Rev. H 71 GF Series Flow Meter Models GF90/GF92
FLUID COMPONENTS INTERNATIONAL LLC http://www.fluidcomponents.com
Check the Voltages Across the RTD Leads
This is done without disconnecting any flow element wires. Voltage measurements can be made at JP3
located on the lower circuit board. Measure voltages described below by touching the DMM test leads
to the terminal screws. The expected voltages are given in Table 12. Refer to Figure 35 for pin numbers
on the standard GF90/GF92 and Figure 55 for pin numbers on the GF90 with VeriCal.
If the measured voltages correspond to Table 12 then the power supplied to, and the signals returning
from the flow element are correct. The problem is most likely a corrupted calibration parameter.
Continue troubleshooting at the next section. If the measured values do not correspond to Table 12
and the flow element was proven to function correctly (see previous section), then the flow transmitter is
defective. If the previous section checks were not possible and the above values did not correspond,
then the problem could be in the flow element or the flow transmitter. Contact Customer Service for
details on how to obtain replacements.
Verify the Calibration Parameters
The flowmeter uses a set of predetermined calibration parameters. Most of these parameters cannot
change. A data page entitled "GF Series Delta R Data Sheet" is located in the back of this manual. It
contains the calibration parameters set in the flow transmitter at the factory. (See the Appendix for a
description of these parameters.) Verify that these parameters have not changed using the steps
describe below.
1. Identify the appropriate "Delta R" data sheet by serial number. Determine the current group number
the flow transmitter by viewing the "Normal Operation" display window. Make sure the current
group number corresponds to the group number on the data sheet.
2. Press Home, 5, 1 to enter the "Verify All" function. Verify all calibration parameters listed in the
first two columns on the data sheet. Note any differences in values.
3. Press Home, 5, 8 to enter the "Verify Calibration" function. Verify all calibration parameters listed in
the second two columns on the data sheet. Note any differences in values.
If any of the parameters have changed, please contact Customer Service. If the parameters have not
changed the problem lies elsewhere. Continue with the next section.
In-Depth
Troubleshooting
The Flow
Transmitter
PIN
NUMBER
APPROXIMATE
VOLTAGE GF90
APPROXIMATE VOLTAGE
GF90 HIGH TEMPERATURE
APPROXIMATE
VOLTAGE GF92
1 to 2 0 0 0
2 to 3 1.1 0.25 1.1
2 to 4 1.2 0.27 1.2
2 to 5 1.1 0.25 1.1
2 to 6 1.2 0.27 1.2
2 to 7 16.5 16.5 11.4
2 to 8 16.5 16.5 11.4
1 to 7 8.25 - 9.0
Table 12. Voltage Readings in Volts DC at JP3
All GF90 and GF92 Units
All Standard GF90 and GF92 Units with 220ohm heaters
All GF90 Units with 110ohm heaters (Veri-Cal flow element)