Bamo BAMOPHAR 107, User Manual

Page: 15 / 15

METHOD FOR ADJUSTMENT OF PID PARAMETERS
In order to setup values for start-up on PID, we recommend to use the Ziegler-Nichols open loop method.
Proceed as follows:
- Connect a recorder to the analogue output or write the displayed values, then draw the diagram pH vs. time.
- Switch on MANUAL the PID regulation mode.
- Reach and keep the measurement close to the set point by adjusting the PID output.
- Apply a step (∆Cde) of 10 % for instance, on the analogue output (e.g. If preset value was 30%, apply 40%).
- Note on the diagram the corresponding time for this event (step of +10%).
- Find out on this diagram both times t and T:
t = delay of response
T = Time corresponding to a variation Δm of measurement equal to percentage of variation
∆Cde of output (∆m = ∆Cde)
This value may be found out from the slope at the beginning of measurements.
- Set up the PID parameters with the values from the following table:
Regulation Gain Ti [s] Td [s]
PID 1,2 x T/t 2 x t 0,5 x t
PI 0,9 x T/t 3,3 x t 00
P T/t 9999 00
PID
analogue
output
8.4
In MANUAL mode (REGUL. MANU)
pH measurement
Reached set point
Time
Time
∆Cde = 10 %
∆m = 10 %
To
To
9.10 TYPE OF INSTRUMENT
pH / RH CHOICE Choose your application, then confirm
pH - METER for pH monitoring
RH - METER for ORP applications
SAVE ? To record the settings, press the icon SAVE.
9.11 FORCED MEASURE
It is possible to force the measurement or the PID.
The first line shows the current measurement.
Confirm to access to the keyboard.
Enter the value you need to simulate.
Note: The value is immediately considered by BAMOPHAR (thresholds, regulation, 4-20mA outputs ...)
To exit this menu, press icon RETURN KEY.
Note : It is possible to force the output 4-20 mA for PID when PID regulation is in manual mode (REGUL. MANU).
If PID regulation is operating, the display of analogue output is in %.
MES
23-11-2018 M-107.01-EN-AE
107-01
/15
pH/ mV monitors
BAMOPHAR 107
22, Rue de la Voie des Bans · Z.I. de la gare · 95100 ARGENTEUIL
Tel
Fax
+33 (0)1 30 25 83 20
+33 (0)1 34 10 16 05
Web
E-mail
www.bamo.eu
export@bamo.fr
INTERNATIONAL