The CBW supports up to 3 conductivity sensors. These sensors are Rosemount submersion/immersion toroidal sensors model 226-56. The sensor connects to the Rosemount 1056 analyzer. The analyzer's signal is sent to the an A/D board on the CBW.
Milnor Part Numbers:
09XSCD0001 - Rosemount 226 - 56 Toroidal Sensor with a special shielded cable
09XSCT0001 - Rosemount 1056 dual channel Conductivity analyzer
09XSCD0002 - Rosemount Conductivity Calibration Fluid Conductivity 1000 µS/cm
Operation
The CBW monitors the conductivity in the press / extractor tank, the pulse flow tank, and the incoming water line.
Press / Extractor Reuse Tank
If the conductivity in the press tank is above a programmed maximum value, a fresh water valve turns on in the last module of the CBW. This valve turns on during pulse flow and stays on until the conductivity drops below a programmed minimum value. If the valve stays on longer than a programmed time, a warning is displayed.
Pulse Flow Tank
If the conductivity in the pulse flow tank is above a programmed maximum value, the tank is drained and refilled with fresh water. If the conductivity is still over the maximum value after refilling, a warning is displayed.
Incoming Water
The conductivity of the incoming water is displayed on the Mentor run screen for reference only. It does not affect conductivity control in the press tank or the pulse flow tank.
Configuring the Analyzer
When the analyzer is powered up for the first time, it goes in to quick start mode. To select a menu option, press the “Enter” button. To move up and down, press the buttons above and below the “Enter” button.
1056 Analyzer General Configuration
- Language – “English”
- S1 Model – “226”
- S1 Measurement – “Conductivity”
- S1 Cell Constant – Press “Enter” to select the default value.
- S1 Model – “226”
- S1 Measurement – “Conductivity”
- S1 Cell Constant – Press “Enter” to select the default value.
- Upper – “Measure 1”
- Center – “Measure 2”
- Temp Units – “°F”
- Ambient AC Rejection Frequency – “60 Hz”
1056 Analyzer Output Configuration
A screen showing the conductivity readings for the two meters should be displayed. Press “Menu” to configure the outputs from the analyzer.
- Select Program -> Outputs -> Configure -> Output 1 -> Range -> 0-20mA
- Press Exit
- Select Output 2 -> Range -> 0-20mA
- Press Exit twice
- Select Range -> O1 S1 20mA
- Change the value to +3000µS/cm. (Make sure to change the units from mS/cm to µS/cm by using the up and down buttons)
- Press Enter when done.
- Select O2 S1 20mA
- Change the value to +3000µS/cm. (Make sure to change the units from mS/cm to µS/cm by using the up and down buttons)
- Press Enter when done.
- Press Exit four times.
Configuring Mentor
Conductivity control is enabled by setting the program constant “Number of Conductivity Meters”. Below are the constants and timers related to conductivity. The constants are under “Pulse Flow” on the program constants page. The timers are under “Pulse Flow Timers” on the output timers page.
Program Constants
Number of Conductivity Meters
0 - Disables conductivity control.
1 - Conductivity control only in the PulseFlow tank.
2 - Conductivity control in the PulseFlow and Press / Extractor Reuse tanks.
3 - Conductivity control in the PulseFlow and Press / Extractor Reuse tanks and incoming water conductivity monitoring.
Max Conductivity in Press Tank
Set to the maximum conductivity allowed in the press tank.
Min Conductivity in Press Tank
Set to the minimum conductivity desired in the press tank.
Max Conductivity in Pulse Flow Tank
Set to the maximum conductivity allowed in the pulse flow tank.
Output Timers
Max Time to Lower Conductivity in Press
A warning is displayed if the conductivity in the press tank doesn’t drop below the min value in the time configured here.
Press High Conductivity Debounce Time
The press tank conductivity must be over the max value for the time configured here before the fresh water valve in the last module turns on.
Press Low Conductivity Debounce Time
The press tank conductivity must drop below the min value for the time configured here before the fresh water valve in the last module turns off.
PF Tank Conductivity Debounce Time
The pulse flow tank conductivity must be over the max value for the time configured here before the tank is drained.
Sensor Wiring
Below is a picture of the inside of the analyzer with the terminal blocks labeled.
24V DC
Wire +24V DC and ground to the terminal block labeled 24V DC
Conductivity Sensor
Wire the sensor as shown below to one of the two cards installed in the analyzer. Each analyzer can handle up to 2 sensors. See the picture above for the location and orientation of the terminal block. Wire the single clear wire to pin 8.
A/D Board
The analyzer wires to A/D board address 23H through an interface board.
Mentor Inputs and Outputs
Conductivity control requires High Speed 8-16 board address 81H and A/D board address 23H
Outputs
Drain Pulse Flow Tank - Board81 MTA5-10 & 5-19
Fresh Water Valve Last Mod - Board81 MTA5-9 & 5-18
Analog Inputs
Pulse Flow Tank Sensor - Board23 MTA54-9
Press Tank Sensor - Board23 MTA54-10
Incoming Water Sensor - Board23 MTA54-11
Purpose of Conductivity Sensors for a CBWTroubleshooting Conductivity Sensors on a CBW
