Endress+Hauser Liquicap M FTI51 - Page 63

Liquicap M FTI51, FTI52 Commissioning
Endress+Hauser 63
6.2.8 Configuring two-point control and buildup mode
!
Note!
• You can also use the probe rod of a fully insulated and vertically installed probe for pump control
(two-point control). The switch points of the empty and full calibration activate a conveyor unit,
for example. If you want to use the two-point control, please note the following:
– Set the necessary measuring range. For more information, see Page 57, "Setting the measuring
range."
– Perform empty and full calibration.
– Set the failsafe mode (MIN/MAX) in accordance with your requirements. For more
information, see Page 66.
• If you switch on the two-point control (Δs mode), the switch point adjustment (as described on
Page 62) is disabled. The switch points correspond to the calibration points.
• The "Buildup mode" ensures that a safe switch point is output even if the probe is not fully
released from the conductive medium (> 1000 μS/cm e.g. sewage sludge). Deposits or buildup
on the rod/rope are compensated for.
To configure the two-point control and/or buildup mode, proceed as follows:
1. Turn the function switch to position 4.
2. Press the "+" key for at least two seconds to switch on the two-point control. The green
LED 5 lights up.
3. Press the "+" key again for at least two seconds to switch on the buildup mode. Green LEDs
4 and 5 light up.
– Pressing the "+" again for at least two seconds switches off both functions. Green LEDs 4 and
5 are off.
4. After you have configured the desired setting, turn the function switch to position 1 to return
to operation.
You have now completed the settings for the two-point control and buildup mode.
Function switch
position
Function – key + key Light emitting diodes (LED signals)
A B C 1 (green) 2 (green) 3 (red) 4 (green) 5 (green) 6 (yellow)
4
Two-point control Δs Press once On
buildup mode Press twice On On **
* These settings are factory settings.
** Switch status signaling (on/off/flashing) depends on the mounting location selected and the failsafe mode (MIN/MAX) set.
The LED flashes if a calibration has not yet been carried out.
1
7
3
5
_
+
Ds