Hach Ultrapure pH/ORP Module Manuel D'utilisation page 17

Table 5 Warning list for pH and ORP sensors (continued)
Warning
PH TOO LOW
ORP TOO LOW
OFFSET TOO HIGH
OFFSET TOO LOW
SLOPE TOO HIGH
SLOPE TOO LOW
TEMP TOO HIGH
TEMP TOO LOW
CAL OVERDUE
NOT CALIBRATED
REPLACE SENSOR
CAL IN PROGRESS
OUTPUTS ON HOLD
FLASH FAILURE
Description
The measured pH is < 0
The measured ORP value is
< –2100 mV
The offset is > 8 (pH) or 200 mV
(ORP)
The offset is < 6 (pH) or –200 mV
(ORP)
The slope is > 60 (pH)/1.3 (ORP)
The slope is < 54 (pH)/0.7 (ORP)
The measured temperature is >
100 °C
The measured temperature is <
0 °C
The Cal Reminder time has expired
The sensor has not been calibrated
The sensor has been in operation >
365 days
A calibration was started but not
completed
During calibration, the outputs were
set to hold for a selected time.
External flash memory failed
Resolution
Calibrate or replace the sensor.
Follow the maintenance procedures
for the sensor and then repeat the
calibration.
Repeat the calibration with a fresh
buffer or sample.
Clean the sensor, then repeat the
calibration.
Make sure that the sensor is
configured for the correct
temperature element.
Calibrate the sensor.
Calibrate the sensor.
Replace the sensor.
Return to calibration.
The outputs will become active after
the selected time period.
Contact technical support.
English 17