Are there step by step instructions to calibrate & verify my 1720e?

Dokument-ID

Dokument-ID TE12189

Veröffentlichungsdatum

Veröffentlichungsdatum 19.12.2019
Frage
Are there step by step instructions to calibrate & verify my 1720e?
Antwort
The below instructions have been developed to assist with the calibration and verification of the 1720e turbidity meter.

Please ensure the below steps are completed in the order they are written.

Note: Menu options may differ between SC200 software versions.

Step 1: 1720e ZERO ELECTRONICS
Note: the 1720e head unit must be completely sealed within the Calibration Cylinder.

Enter the following into your SC200 display:
  • Select MENU
  • Select SENSOR SETUP
  • Select CALIBRATE
  • You should now see a status bar showing 0% - 100% as the 1720e performs a self-check
  • Select HOME

Step 2: STABLCAL CALIBRATION (recommended every 90 days)
Note: before starting the calibration, read the Sensor Calibration & Verification Guidelines within the 1720e User Manual.

Enter the following into your SC200 display:
  • Select MENU
  • Select SENSOR SETUP
  • Select CALIBRATE
  • Select STABLCAL CAL
  • Choose from:
    • Active 4/20mA output will output calibration values (during calibration process).
    • Hold 4/20mA output will hold output value at pre-calibration value (until calibration is complete).
    • Transfer 4/20mA output will transfer a predetermined output value (until calibration is complete).
  • Select ENTER
  • Enter the calibration solution value (use arrow keys to enter a value of 20NTU)
  • Select ENTER
  • Pour StablCal into the Calibration Cylinder
  • Place the 1720e head unit on top of the Calibration Cylinder
  • Select ENTER
  • A Turbidity reading should now display
  • Select ENTER to accept the turbidity value for instrument calibration

You should now see a screen that looks like this:




Select ENTER to verify calibration (recommended with ICE-PIC) or select BACK to Exit.


A note about 1720e gain
A 1720e will successfully calibrate with a gain of anywhere between 0.5 and 1.2. Variance is due to differences between individual incandescent lamps, cleaning and overall instrument health. If your 1720e gain is 1.1 and above, it is likely the lamp and/or photocell require replacement.


Step 3: CALIBRATION VERIFICATION
  • Continue from Step 2 above
  • Select DRY to verify
  • Select verification module value (1 NTU STD or 20 NTU STD)
  • Remove 1720e head unit from StablCal
  • Dry 1720e photo detector with soft cloth
  • Place ICE-PIC into Calibration Cylinder
  • Place 1720e head unit top of ICE-PIC (located in calibration cylinder)
  • Select ENTER
  • Input ICE-PIC serial number (last 4 digits)
  • A turbidity value should be displayed.
  • Select ENTER to accept the Turbidity value

You should now see a screen that looks like this:


 
  • Enter the initials of the Operator performing verification (identifier)
  • Select ENTER to continue
  • Select ENTER to return 1720e to normal measurement mode
  • Select ENTER to continue

A Verification History summary will now display
  • Select ENTER to continue
  • A Calibration History will now display
  • Select ENTER to continue


A note regarding Verification History
The calibration and verification history logs contain information on the last 12 calibrations and the last 12 verifications. The calibration history log shows the gain value, the time and date of the calibration, and the initials of the operator performing verification. The calibration history log is accessed from the Calibrate menu. The verification history log is accessed from the Verification menu (a submenu of the Calibrate menu).

When the instrument is received from the factory, default values or blank spaces will be shown for the calibration and verification history information. Those values will be replaced with real data as the history log is filled.

The data is retained as first in, first out. When the log is full, the newest entry is stored and the oldest entry in the log is deleted.

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