Walchem WebMaster Instruction Manual download pdf (Page 39)

sample stream to resume control. If failed, refer to Section 7 for troubleshooting help. A

calibration will fail if the offset calculated is more than 200 mV, or if the slope calculated is

outside of 0.5-1.5.

1 pt Buffer Cal

Step 1 will explain that control is suspended during the calibration procedure. Press the Enter key

when the cursor is on “Continue” to start the calibration. To cancel the calibration, press the Next

key to move the cursor to “Cancel”, then press the Enter key.

Step 2 will prompt you to rinse the electrode, and place it into the buffer solution. Press the Enter

key to continue.

Step 3 will ask you to enter the value of the buffer solution. Use the Arrow keys to change the

value, then press the Enter key to highlight ‘CONTINUE’, then press Enter again to put the value

into memory.

Step 4 will display the mV output of the electrode in the buffer. When this reading is stable, press

the Enter key to continue.

At the end of the calibration, the display will tell you if the calibration was successful or if the

calibration failed. If successful, press the Enter key after the electrode has been replaced into the

sample stream to resume control. If failed, refer to Section 7 for troubleshooting help. A

calibration will fail if the offset calculated is more than 200 mV, or if the slope calculated is

outside of 0.5-1.5.

1 pt Process Cal

Step 1 will display the current pH reading of the system water. Below that, use the Arrow keys to

fill in the new value, then press the Enter key to highlight ‘CONTINUE’, then press Enter again to

put the value into memory.

At the end of the calibration, the display will tell you if the calibration was successful or if the

calibration failed. If successful, press the Enter key after the electrode has been replaced into the

sample stream to resume control. If failed, refer to Section 7 for troubleshooting help. A failed

calibration is caused by an offset from the uncalibrated reading of more than 200 mV.

4-20 mA Input 1-8 Calibration

Calibrate 4 mA

Following the instructions for your 4-20 mA transmitter, supply the WebMaster controller with a 4

mA signal from the transmitter. You should verify that the transmitter is accurate by measuring the

output with an ammeter. You can read the present value of the mA signal as measured by the

controller on the top line of the display. If the value is not exactly 4 mA, press the Enter key when

the cursor is on “Calibrate 4 mA”. Once this is done, the controller will read the transmitter signal

as exactly 4 mA.

The transmitter signal must be +/- 2 mA of the expected 4 mA value, or else the calibration will

fail.

Calibrate 20 mA

Repeat this process, supplying the controller with a 20 mA signal from the transmitter, and press

the Enter key when the cursor is on the “Calibrate 20 mA” to make the present value exactly 20

mA.

The transmitter signal must be +/- 2 mA of the expected 20 mA value, or else the calibration will

fail.

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Walchem WebMaster Instruction Manual Page 39

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