Doc. No. 06EN003291 Rev. A
5 - 7
Model ST98 Flow Meter
CHAPTER 5 - TROUBLESHOOTING
FLUID COMPONENTS INTL
Verification Of The Electronics
Check the Flow Transmitter Voltages
Check the voltages in Table 5-6 being sure the volt meter is in the volt mode. Using the DVM in the current mode
will damage the flow transmitter.
Table 5-6. Instrument Voltages
PIN NUMBER
VOLTAGE
P3-1 TO P3-5
-9 TO -5 VDC
P3-1 TO P3-6
+5 ± 0.2 VDC
P3-1 TO P3-11
+2 ± 0.01 VDC
TP1 +15 TO TP1 GND
+15 ± 0.5 VDC
TP1 +20 TO TP1 GND
+20 ± 0.5 VDC
TP1 +10 TO TP1 GND
+10 ± 0.01 VDC
If the voltage checks correspond to Table 5-6, the electronics are functioning properly.
Transmitter Circuit Calibration Check (Delta R Verification)
Equipment Needed
FC88 Communicator or equivalent
DVM
Original Delta R Data Sheet - Match By Serial Numbers
2 Precision Decade Resistance Boxes, 0.1% (Largest Steps: 1K Ohm, Smallest Steps 0.01 Ohms)
10 feet of wire, 22 to 18 AWG
Small Flat Blade Screwdrivers, 3/32 and 1/8 inches wide blades.
Small Wire Cutters
Small Wire Strippers
Procedure
1.
Turn power off.
2.
Mark all wires connected to terminal strip TS2 (or the terminal block for remote instruments) so they may be
reconnected to the proper terminals. Disconnect the wires.
3.
Connect the resistance decade boxes to terminal strip TS2 (or the terminal block for remote instruments) as
shown in Figure 5-4. Check the Delta R Data sheet for the nominal resistance value. Set the decade boxes for
the nominal resistance value ±0.01%.
4.
Turn the power on and allow the instrument 5 minutes to stabilize.
5.
Press [T] [ENTER] to view the normal operating mode. Adjust the active and reference decade boxes. Verify
the parameters on the FC88 change.
If the display changes, proceed to the next section. If the display is frozen the instrument is malfunctioning.
Contact Customer Service.
