Walchem ehe series Instruction Manual page 19

Electronic metering pump
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(11) Setting the Stroke Rate of SET point 2:
Set the stroke rate corresponding to the current setting of SET
point 2 using the  and  keys.
The allowable range is 0-360 spm and the default setting from
the factory is 360 spm.
(12) Press the STOP/START key to confirm the pump speed value of
SET point 2 and move back to the WAIT mode. (Pressing the
EXT key will move back to setting the current value of SET
point 1 – step #4. Press the STOP/START key anytime to exit
and go to the WAIT mode)
(13) Press the EXT button to start EXT pump operation. The WAIT
backlight will go out, EXT will become backlit, and the ON
lamp will begin to blink with every stroke. The pump will
operate at the speed corresponding to the incoming current (mA)
signal.
To stop the pump, press the STOP/START key once and the
pump will enter the WAIT mode.
Pressing the EXT again will restart the pump in EXT mode. (see
wiring section to ensure the analog wiring is correct)
The pump speed will now be determined by the
level of the milliamp signal as shown in the graph.
The stroke length can be adjusted manually to set
the volume pumped per stroke.
360
P2
270
180
P1
90
0
4
A1
16
8
12
16
20
A2
INPUT SIGNAL, mA

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