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Your DPM Mass Flow Meter was thoroughly checked at numerous
quality control points during and after manufacturing and assembly
operations. It was calibrated according to your desired flow and pressure
conditions for a given gas or mixture of gases.
It was carefully packed to prevent damage during shipment. Should you
feel that the instrument is not functioning properly, please check first for
these common conditions:
x
Are all cables connected correctly?
x
Are there any leaks in the installation?
x
Is the power supply correctly selected according to
requirements? When several meters are used, a power supply
with appropriate current rating should be selected.
x
Were the connector pinouts matched properly?
x
When interchanging with other manufacturers’ equipment,
cables and connectors must be carefully wired for correct pin
configurations. Check these.
x
Is the pressure differential across the instrument sufficient?
Also check the Troubleshooting Guide provided in Section 10.2.
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TABLE XXIII: TROUBLESHOOTING GUIDE
NO.
INDICATION
LIKELY REASON
SOLUTION
1
No zero reading, with
no flow condition.
Flow Tare procedure
was not performed
properly.
Perform Auto Zero Procedure (see
section
6.4.
4 "Sensor Zero Calibration").
2
Status LED indicator
and OLED Display
remain blank when
unit is powered up.
No response when
flow is introduced
from analog outputs
0-5Vdc or 4-20 mA.
Power supply is bad or
polarity is reversed.
Measure voltage on pins 7 (+) and
8 (-) of the 8-pin MinDIN
connector. If voltage is out of
specified range, then replace
power supply with a new one.
If polarity is reversed (reading is
negative), make correct
connection.
PC board is defective. Return DPM to factory for repair.
3
OLED Display
reading and/or
analog output
0-5Vdc signal
fluctuates in wide
range during flow
measurement.
Output 0-5Vdc
signal (pins 6 [+] and 4
[-] of the MiniDIN
connector) is shorted
on the GND or
overloaded.
Check external connections to pin
6 (+) and 4 (-), of the MiniDIN
connector. Make sure the load
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