Electro-Chemical Devices (ECD) T80 - Manual (Page 43)

Press STAND Enter Zero Value
Press ▲ ▼ NEXT 0.00 NTU or ppm, mg/L, % Solids (use arrows and NEXT to enter process value)
Press OK 0.00 NTU, Accept Value?
Press YES Stand Cal Complete: 8.61 NTU, DESIRED VALUE: 0.00 NTU, OFFSET 8.61 NTU
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
4.6.3 MANUAL C
AL
Manual Cal provides two options, OFFSET and SLOPE. OFFSET is an online/in process Zero Point Calibration
Only. It is the same value that is adjusted in Standardize and it is the set same way. SLOPE is an adjustment of
the NTU/volt aspect of the turbidity curve pivoting from the Offset point. The SLOPE window displays a unit less
number that is changed to adjust the calibration.
Example: TRITON® TR6 in 400 NTU solution but reads 380 NTU. The SLOPE reads 108. The slope of the
calibration curve needs to increase so that the voltage that is generating 380 NTU will generate 400NTU. To
determine the new slope, first divide the desired value (400 NTU) by the actual value (380 NTU) and multiply the
current slope by that number. 400 NTU/380 NTU * 108 = 113.7 the new slope. Enter 113.7 in the SLOPE window,
Save the calibration and the analyzer will read 400 NTU.
SLOPE ADJUSTMENT
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 Place Sensor in Air or with the sensor in the process solution
Press MANUAL OFFSET or SLOPE
Press SLOPE Enter SLOPE Value108.00
Press ▲ ▼ NEXT 113.7 (use arrows and NEXT to enter process value)
Press OK 113.7 Accept Value?
Press YES Manual Cal Complete: OFFSET 8.61 NTU, SLOPE 113.7
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
4.7 C
ONDUCTIVITY
S
ENSORS
AUTO Calibration recognizes Air for zero point (Cal 1) and 50µS, 100µS, 500µS, 1mS, 5mS, 10mS, 50mS and
100mS solutions for the span (Cal 2). Any calibration solutions can be used but the conductivity value will have
to be entered manually. Use a calibration standard near the conductivity of the process solution. Example uses
air and 1mS.
4.7.1 AUTO C AL USING A IR AND C ONDUCTIVITY S TANDARD
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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