Hach-Lange PROGNOSYS - Manual (Page 16)

Message 1 Possible cause Solution
RFID-Data not valid The RFID calibration data for
the cartridge could not be
read. Enter the sensor code for the temporary sensor
operation manually, then replace the cartridge.
Reference potential
uncertain The data supplied by the
reference system for the
cartridge is not reliable. Examine the measurement values and if necessary,
replace the cartridge.
Initial matrix
correction required When a new cartridge is
installed, a matrix correction is
necessary after 24 hours. Complete a one-point matrix correction for NH
4
-N and
NO
3
-N. Complete a one-point matrix correction for a
higher measurement accuracy for small values for NH
4
N
+K and NO
3
N +Cl.
Matrix correction
NH4 necessary A matrix correction for NH
4
is
necessary.
Complete a one-point matrix correction (MX1) or value
correction (VC1) for NH
4
. If the calibration is good in
comparison to the laboratory value, use the
measurement value as the calibration value when a
calibration is started.
Matrix correction
NO3 necessary A matrix correction for NO
3
is
necessary.
Complete a one-point matrix correction (MX1) or value
correction (VC1) for NO
3
. If the calibration is good in
comparison to the laboratory value, use the
measurement value as the calibration value when
calibration is started.
Replace cartridge The time (one year) for the
cartridge is expired. Examine the measurement values and replace the
cartridge as soon as possible.
no contact Ref1 Problem with the contact
between sensor and reference
system.
• Remove the cartridge.
• Examine and clean the contacts.
• Examine the spring action of the contacts in the
sensor and replace the spring insert if necessary.
• Contact technical support to examine and replace the
electronics if necessary.
• Replace the cartridge if necessary.
no contact Ref2
no contact NH4
no contact NO3
no contact K+
no contact Cl-
Humidity cartridge
contacts There is humidity between the
sensor and the cartridge.
• Make sure that the cartridge screws are tightened
correctly.
• Examine the gasket.
• Dry the contact area.
• Contact technical support to replace the gold spring
contacts if necessary.
• Replace the gasket.
• Replace cartridge and gasket.
Ref electrode aged The yellow plug is still on the
reference system. The time of
the reference system is
expired (membrane pores are
blocked) and can not operate
correctly.
• Remove the yellow plug from the reference system.
• Carefully try to clean the outlet of the reference
system from the cartridge mechanically. Carefully
remove any objects with a toothbrush or a similar
object.
• Carefully apply a drop of hydrochloric acid (5%) only
onto the reference system. If it foams, repeat until the
foaming stops. If this is not successful, replace the
cartridge.
14 English