E-822-9-E
9．PULSE/ANALOG CONVERTER BOARD (OPTION)
An F/I converter board to provide an analog output proportional to the pulse frequency after weight
conversion may be added as an option.
（
1
）
0 to 100
μ
A or 0 to 10mV output
★
Output adjustment is made with VRI.
（
2
）
In cases of 4 to 20mA, 10 to 50mA or 1 to 5V output
10．OPERATION
10.1 Preparation Before Operation
（
1
）
Inspect that your instrument and related equipment are correctly installed and wired with no points
left unfinished (including size, meter error and frequency division settings).
WARNING:
Make sure to see that the power terminals are connected to a
power source of the rated voltage. Applying a power source of
incorrect voltage could ruin your instrument.
（
2
）
Preoperational Checks
Check to see whether or not the computer registers counts with no flow.
（
3
）
How to Check
①
Turn on power and make sure that the front panel LED lights at intervals of two or three seconds.
②
Depress the CHECK button and confirm individual settings in the CHECK mode.
(CHECK mode operation is described on Sec.12.)
10.2 Operation
（
1
）
Turning on power
The LED will light up about a second later and stays on for about two seconds before the RUN mode is indicated.
（
2
）
Allow steam to flow to initiate service operation.
11．TROUBLESHOOTING
Output
J
9
J
10
4 to 20 mA
2
－
C
2
－
C
10 to 50 mA
2
－
C
2
－
C
1 to 5 V
1
－
C
1
－
C
SYMPTOM
CHECK
POSSIBLE CAUSES
1. The LED fails to come on.
1. Inspect fuse.
2. Make sure of power source
voltage.
1. Fuse is blown.
2. Line voltage is improper.
3. A fault in internal power supply.
2. The LED shows RUN mode but
fails to count incoming pulses.
1. Input signal lines.
2. Signal coming in?
1. Incorrect input wiring.
2. Flowmeter preamlifier is at fault.
3. A fault in the input circuitry.
3. The LED indicates a fault in the
probe.
1. Input signal lines.
1. Incorrect input wiring.
2. Flowmeter preamplifier is at fault.
4. Erratic accumulated total
reading.
1. Size (nominal dia.) and pressure
settings (see "CHECK Mode").
1. A fault in the internal assembly.
If the trouble is suspected to be internal to the steam flow computer, seek our service.
NOTE: J9 and J10 are jumpers on the computing board.
Fine output adjustment is made with VR2 (zero adjust) and VRI (span adjust).
