Fluid Components International GF90_GF92 - Manual (Page 78)

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GF Series Flow Meter Models GF90/GF92 74 Doc. No. 06EN003229 Rev. H
NOTE: Be sure to use the Delta R table supplied with this flowmeter. Use two decade resistance
boxes, and or fixed resistors.
A Delta R table is supplied with each flowmeter. The table can be used to verify correct operation of the
transmitter independent of the flow element by simulating the RTDs' input with precision resistance
decade boxes. In order to verify that the flow transmitter is functioning properly, the inputs from the
RTDs may be disconnected and precision resistance of known value substituted. Then measure the
flow transmitter output (voltage, current, or relay logic switch points) and compare to the Delta R table.
Perform the following steps to verify operation.
1. Verify that the serial number of the flowmeter and the serial number of the Delta R Data Table
Sheet are the same before proceeding. If the serial numbers do not match, the Delta R Data Sheet is
not applicable. Each flowmeter has a unique Delta R Data Sheet.
2. Verify the Delta R Data Sheet has the appropriate group number.
3. Disconnect JP3 and connect the decade boxes as shown in Figure 37.
4. Set the reference decade box to 100 or 1000 ohms, depending on type of nominal flow element
resistance.
5. Set the active decade to the same reading as step 3, plus the Delta R value from the Delta R Table
(i.e. 1000 ohms + 25 ohms = 1025 ohms).
6. For current loop outputs, connect the milliamp meter between the +I OUT (positive lead) and
OUT COM (negative lead) on connector terminal JP6 and select a range appropriate for the output
current. Connect a DMM across the +E OUT and OUT COM on connector terminal JP6 for the
voltage output signals.
7. Turn power ON and allow the instrument 10 minutes to stabilize.
8. Be sure the flow transmitter is in the correct group.
9. Increase the decade resistance connected to the active terminal by the value shown in the
Delta R column for the low-limit signal. Set the active decade for a resistance of 1000 ohm or 100
ohm + the Delta R value. The meter reading should equal the recorded value within ±1% of the full
signal range.
Figure 37. Decade Box Connections
Verifying
Delta R’s