Fluid Components International FR73B Complete Manual - Manual (Page 8)

FLUID COMPONENTS INTERNATIONAL LLC FR78B Flow Switch/Monitor
This page is subject to proprietary rights statement on last page 8 Doc. No. 06EN003281 Rev. A
Terminal Pin Number
(Wire Color)
Resistance
In Ohms
From Pin 7 (White, Black and Shield)
To Pin 8 (Yellow)
4000
From Pin 8 (Yellow)
To Pin 9 (Red)
4000
From Pin 7 (White, Black and Shield)
To Pin 10 (Blue)
221
From Pin 7 (White, Black and Shield)
To Pin 9 (Red)
8000
From Pin 8 (Yellow)
To Pin 10 (Blue)
4221
From Pin 9 (Red)
To Pin 10 (Blue)
8221
Shield To All Pins
Open Circuit
Table 2 - Flow Element Resistance In Ohms
If an open circuit exists for one RTD and a value of twice the resistance exists for the other RTD, then there is probably a miswiring or
mislabeling problem.
After replacing the flow element, it will be necessary to follow the set point adjustment procedures found in the Operation section
before returning the instrument to service. (See page 4)
If the flow element resistance is correct, proceed to the voltage verification test.
Verification of Flow Element Voltage
If the above resistance checks are good, plug in the control circuit and apply power. Measure the voltages in
Table 3. Terminal pins are labeled and are located on the face of the control circuit. (See Appendix A - Figure 6.)
l a n i m r e T m o r F
n i P
l a n i m r e T o T
n i P
* d e t c e p x E e g a t l o V
) + ( 9 ) - ( 7 C D V 2 2
) + ( 8 ) - ( 7 C D V 2 1
) + ( 9 ) - ( 8 C D V 0 1
) + ( 0 1 ) - ( 7
) r e t a e H tt a W 2 ( C D V 2 2
) r e t a e H tt a W 5 . 1 ( C D V 9 1
) r e t a e H tt a W 1 ( C D V 5 1
Table 3 - Flow Element Voltages
* Voltages are dependent on temperature
Spares
FCI recommends that one control circuit be kept as a spare. Check the Order Information Sheet that was filled out at the time of order
for the correct part and dash number. Contact FCI for specific recommendations.
Note: If the voltages are not correct, then remove and replace the control circuit.