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18
17. The value of the digit may now be incremented or decremented by pressing ⇑ ⇓.
0
RL1 On Point% 0
003.00 P411
18. Press ENT to store the value. The highlighting will disappear. If an invalid number is entered then the display
will revert to the last valid value.
19. The relay off point is programmed in the same way (all other numeric parameters are programmed in a similar
way).
20. When programming is complete, return to the TOGGLE RUN menu and close the padlock.
21. Note; any programme changes will not alter the outputs, which remain frozen,
until the TOGGLE RUN padlock has been closed.
5.3 DIAGNOSTIC PARAMETERS
Apart from the user-settable parameters described above, there is another set of diagnostic parameters, which display
measured or calculated data to analyse and optimise system performance. These have the prefix “D” and cannot be
modified.
5.4 EX-FACTORY SYSTEM FEATURES
The MSM400 Control Unit is supplied with default parameters that allow basic initial operation. The values and
descriptions are listed in appendix two of this manual.
6.0 CALIBRATION
There are several methods for calibrating the MSM400, AUTOCAL and MANUAL ENTRY, these together with some
important basic principles are explained below. Calibration always comprises two stages, zero setting and span setting.
Zero setting calibrates the system so that the control unit indicates 0% solids in clear liquid.
Span and lab value setting calibrates the system to monitor suspended solids accurately.
The recommended, simplest and most accurate method for calibrating the MSM400 is by using the AUTOCAL
procedure, which is explained below.
6.1 ZERO SETTING
INITIAL ZERO
The MSM400 has the facility to warn the operator that the sensors require cleaning. The first zero calibration will be
stored in initial zero reference parameter, “Init zero ref”. Future zero calibrations are compared with this value and
any significant change will produce a warning message like the one shown below.
SET ZERO 0
In clear liquor 0
press ENT to set
Sensor dirty
The actual difference required to produce this warning is programmed in dirty point (SETUP – ENGINEERING
– SENSOR LIMITS – Dirty Pt). The default value is 0, which disables this feature. To enable the feature it is
suggested that a value of approximately 6 dB is entered.
Note: this warning feature is not active until the first zero calibration has been carried out.
To reset or clear initial zero value, ‘0’ must entered in Initial zero reference parameter (CALIBRATION – MANUAL
ENTRY – ZERO REF – “Init Zero–1MHz” and “Init Zero–3MHz”, P123 & P124).