IM-P403-89
EMM Issue 8
47
An automatic probe scale detect feature is available if a CP32 two-tip probe is fitted
and selected. It selects the action taken by the controller to a probe with too high a
resistance, caused, for example, by scaling. If 'CLEAN' or 'AL + CLEAN' is selected, the
interval time is automatically set to 10 minutes until the scale is removed – see Figure 32.
Constant
Pulsed
Fig. 32
Duration
10 minutes
OUTPUT
RETRANS
notes
This sets the controller outputs to suit the two current loop standards in common use. It
retransmits the actual conductivity or TDS with the respect the full-scale range (default) or a
user configurable range. For example: 0 µS = 4 mA and 100 µS = 20 mA.
Note:
If a purge time has been selected, the 0-20 mA or 4-20 mA is held at the value recorded
at the end of the last purge cycle.
0 or 4 mA
This selects either 0 or 4 mA (default). When entering this menu the currently selected option
will be displayed in the key right part of the screen.
Set
4 mA and 20 mA retransmission output is set to equivalent PV value.
Normally 0 or 4 mA = 0 µS / cm (or ppm), and 20 mA = PV full scale µS / cm (or ppm), though
this can be changed if required. The minimum value that can be set is 0000, the maximum
is PV full scale.
Check
Enables the user to make adjustments to the 4 mA and 20 mA settings, to calibrate to a
DVM reading.
OUTPUT – COMMS
notes
Address
is set to 1 unless there are other units on the same system.
Baud rate
- Set to match the Baud rate of the line or system.
IR COMMS
- Infrared, select as a master or slave device. See Section 7 - 'Communications'.
Summary of Contents for BC3250
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