ABB AWT420 Operating Instruction

Also see for AWT420: Commissioning instructions Manual Manual

Contents

ABB AWT420 Operating Instruction Manual pdf 59 page image

AW T4 2 0 | U N I V E R S A L 4 - W I R E , D U A L- I N P U T T R A N S M I T T E R | O I/A W T4 2 0 - E N R E V. B59pH/Redox/ORPThis section describes how to calibrate the sensor and involves measuring thesensor’s sensitivity to pH and temperature by exposing the sensor to samples ofknown pH/Temperature valuesNotes.• Access to the Calibrate menu is via Calibrate and Advanced levels only.• During calibration, current outputs and alarms are set to hold automaticallyif Hold Outputs is enabled – see below.Menu Comment DefaultSensor Cal See pH/Redox/ORP calibration, page 52There are four possible calibration modes:• 1-point manual calibration (adjusts the calibration check value)• 2-point manual calibration (adjusts the check and slope values)• 1-Point automatic calibration (adjusts the calibration check value)• 2-Point automatic calibration (adjusts the check and slope values)Note Automatic calibrations are not available for Redox/ORP measurementsTemperature Cal See Temperature calibration procedure, page 69Edit CalpH Slope Note: pH sensors only.Edit the slope value:• Valid slope values range from 40 to 150 %100%pH Offset Note: pH sensors only.Edit the offset value:• Valid offset values are: 0.00 to 14.00pH7.00pHmV Slope Note: Redox/ORP sensors only.Edit the slope value:• Valid slope values range from 40 to 150 %100%mV Offset Note: Redox/ORP sensors only.Edit the offset value:• Valid offset values are: ±1000mV0mVTemp Slope Edit the temperature slope value:• Valid slope values range from 40 to 160 %100%Temp Offset Edit the temperature offset value:• Valid offset values are ±40 °C0°CSample Collection Note: pH sensors only.See In process calibrations, page 79.Collection Complete Note: pH sensors onlySee In process calibrations, page 79.Restore Cal Defaults Resets slope and offset values to default values.CalibrateExitMenuSelect