Hach-Lange POLYMETRON 9500 Ultrapure pH_ORP Module User Manual - Manual (Page 17)

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