17
(8) ...... Press
again and the symbol will prompt you to
put the probe in ‘Buffer 2’. Wait for the mV value to
settle.
(9) ...... Press
again. This will accept the second
calibration value and will display the ‘mV/pH’ (and ‘%’
Slope) result of the calibration.
(10) .... Press
again to accept this calibration and exit
calibration mode. Press any other key to abort calibration.
For a single-point calibration, only one (1) buffer is used. The theoretical value for pH 7.00 is used to complete the
Calibration Curve.
If the calibration is unsuccessful (slope < 70% or offset > ± 30 mV)
and ‘ERROR CALIBRATE’ and ‘E7’ are displayed; the calibration
should be repeated or else the controller reverts to using the ‘last
successful’ calibration performed.
A slope of less than 70% indicates a dirty/faulty probe or contaminated buffer.
4.5
Pump Timers and Solenoid Valve Control Timers
It is not possible to change timer values while in ‘RUN’ mode. Unit must be in the ‘OFF’ mode to change values and
settings.
Pump Run Time:
This timer is set to the maximum time the pump can be on. If the timer is set to over 11:01 hours, the pump will run
continuously.
This timer is started when a pump is on and the pH value is outside the set points. The controller will stop the pumps when
the time reaches ‘0’ and activate ‘ALARMS.’ The run time is reset each time the pH enters the desired set point region.
Solenoid Delay Pump Valve Time:
The Solenoid Valve Relay output may be activated when the pH is within the set points for the time specified by ‘Delay
1.’ This may be used for system integration and for emptying a batch tank etc.
The ‘Delay 1’ Timer defines the period to allow pH and system parameters to settle.
The ‘Delay 2’ Timer (ON time) defines how long the valve will stay open. When these Delay Timers are active, pump
dosing cannot take place but the DP5000 will monitor the pH. The ‘Delay 2’ timer starts when the outputs are activated.
If the pH drifts outside of the set point and range, the solenoid relay will be deactivated.
If a ‘Delay 2’ time goes below one hour, then the display will change to ‘minutes : seconds’ from ‘hours : minutes.’
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