Walchem ehe series Instruction Manual page 18

Electronic metering pump
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(5) Setting the Input Current (mA) of SET point 1:
Use the  and  keys to set the input current (mA) of SET point
1. The value will increase with the  key and decrease with 
the key. The numerical value will change slowly by 0.1mA if the
keys are pressed briefly, but will increment rapidly if they are
held for more than 3 seconds.
The allowable range is 0.0-20.0mA and the default setting from
the factory is 4.0mA.
(6) Press the EXT key to confirm the current value of SET point 1
and move to the pump speed (SPM) setting of SET point 1. "P
0" will be the default setting (Pump speed=0spm) and the SET
and 1 will remain backlit.
(7) Setting the Stroke Rate of SET point 1:
Set the stroke rate corresponding to the current setting of SET
point 1 using the  and  keys.
The allowable range is 0-360 spm and the default setting from the
factory is 0 spm.
(8)
Press the EXT key to confirm the pump speed value of SET point
1 and move to the Current Input setting of Set point 2. The
backlight behind SET will remain, but the light behind 1 will go
off and 2 will become backlit. The default display will show
A20.0.
(9) Setting the Input Current (mA) of SET point 2:
Use the  and  keys to set the input current (mA) of SET point
2. Do NOT set the value equal to SET point 1 or an error (ERR1)
will occur.
The allowable range is 0.0-20.0mA and the default setting from
the factory is 20.0mA.
(10) Press the EXT key to confirm the current value of SET point 2
and move to the pump speed (SPM) setting of SET point 2.
"P360" will be the default setting (Pump speed=360spm) and the
SET and 2 will remain backlit.
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