ISD Alarm Message Diagnostics fnn: CHK VAPOR FLOW MTR
23
fnn: CHK VAPOR FLOW MTR
Failure of locked rotor test - possible locked vapor flow meter
ISD MONITORING CATEGORY
System Diagnostic
DIAGNOSTIC PROCEDURE
Field Notes
See “Removing & Replacing Vapor Flow Meters” on page 33 when replacing a vapor flow meter. After any repairs,
check the Air Flow Meter totals. Dispense check again.
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Is back pressure
still failing?
Is back pressure
still failing?
Assist Site?
Is there at
least one hose
with passingback
pressure?
Run TP 201.5 Air to Liquid
Volume Test
Replace Vapor Flow
Meter
Retest equipment to ensure
proper operation
Does the
test air flow meter
register A>0 on one
or more hoses?
Check all hoses using the vapor
flow meter under test for liquid
and drain if necessary.
Run a 60 DFH TP 201.4 Dynamic
Backpressure Test on all hoses
using the Vapor Flow Meter.
Swap hanging hardware with a
known good set. (Example: whip,
breakaway, hose and nozzle).
Remove Vapor Flow Meter and
replace with temporary pipe.
See Repairing Collection Vapor
Recovery Equipment in the
Miscellaneous Maintenance
section of this manual.
Retest known good hose and
backpressure again. Add 0.08 IWC
(@60 CFH) to test value and
compensate for the missing Vapor
Flow Meter.
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