Electro-Chemical Devices (ECD) T80 - Manual (Page 45)

4.8.1 S TANDARDIZE
With the sensor in the process solution, take a grab sample from the process and determine the TDS using a
qualified laboratory method.
Action Prompt
Double Press any Button MENU HOME, Hold is OFF
Press HOLD Hold freezes 4-20 mA Output and locks Alarm Relays during Calibration
Press CAL Is this a new Sensor? (Yes, erases CAL Log in INFO, NO adds CAL to existing Log)
Press NO With the sensor in the process solution or calibration standard
Press STAND Enter the laboratory determined TDS value
Press ▲ ▼ NEXT xxx.xx ppm (use arrows and NEXT to enter process value)
Press OK xxx.xx ppm, xxx.x mV, Accept Value?
Press YES Current value: xx.xx ppm, Desired value: xx.xx ppm, Offset: xx.xx ppm
Press OK Back to Cal Menu
Press HOME Hold is ON (Press HOLD to turn off Hold)
Press HOLD Turn off Hold
Press EXIT Main Display
4.9 R
ESISTIVITY
S
ENSORS
AUTO Calibration recognizes Air for zero point (Cal 1) and a Meg-Ohm process solution for the span (Cal 2). Use
the actual process solution or a solution near the resistivity of the process solution. The example below uses air
and 15 MΩ. The Cal 1, air calibration value is very stable and need not be done for every calibration.
4.9.1 AUTO C
AL USING
A
IR AND
M
EG
-O
HM PROCESS WATER
Action Prompt
Double Press any Button MENU HOME, Hold is OFF
Press HOLD Hold freezes 4-20 mA Output and locks Alarm Relays during Calibration
Press CAL Is this a new Sensor? (Yes erases CAL Log in INFO, NO adds CAL to existing Log)
Press Yes/NO Remove the Sensor from Solution and dry the front end
To perform zero CAL press CAL 1, to skip zero cal press CAL 2, only if a zero cal was previously done on the sensor
Press AUTO then CAL 1 STABILIZING, 55.000 MΩ, 1.20 V, 55.000 MΩ corrected, Accept Cal?
Press YES CAL 1 Value 55.000 MΩ, Continue to CAL2? Move sensor to MΩ solution
Press YES STABILIZING, 9.875 MΩ, 517 mV, 9.875 MΩ corrected, Accept Cal?
Press NO Enter actual MΩ value of the solution, Accept Cal
Press YES OFFSET: 55.000 MΩ, 1.20 V , SLOPE: 0.938 (data written to Log)
Press OK Calibration complete
Press HOME Hold is ON
Press HOLD Turn off Hold
Press EXIT Main Display
4.9.2 S
TANDARDIZE
With the sensor in the process solution, take a grab sample from the process and determine the conductivity
using a qualified laboratory conductivity meter.
Action Prompt
Double Press any Button MENU HOME, Hold is OFF
Press HOLD Hold freezes 4-20 mA Output and locks Alarm Relays during Calibration
Press CAL Is this a new Sensor? (Yes, erases CAL Log in INFO, NO adds CAL to existing Log)
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