wtw pH 171 2K, Operating Manual

Page: 123 / 160

Messages
127
Organization of messages
During the measuring operation different conditions can occur which lead to (error) messages. The
messages can be read in the normal measuring mode.
l
If messages occur (in the normal measuring mode) they are indicated in the upper line of the
display. When a message is produced the
key symbol starts flashing.
l
If only one message occurs the symbols disappears after being accepted with the key,
otherwise the next message is displayed.
l
After all the messages have been accepted the key symbol is constantly indicated and the
messages can be reread. If new messages occur the symbol flashes again until all messages
have been accepted.
l
If a condition which led to a message is left this will also eliminate the corresponding message.
l
With occurring messages the measuring mode can only be left when all messages have been
accepted. Each time when the
key has been pressed the messages are frozen for 2
seconds so that a continuously occurring or looping message cannot prevent this. Thus
leaving the measuring mode is facilitated.
Possible messages: The following messages can occur (ordered according to priority):
Indication in the message line:
"ERROR" Serious error; measurement is blocked.
ð
send instrument to WTW
"CAL ERROR A"
"CAL ERROR B" There is no valid calibration for the corresponding channel.
"CH ERROR B" Disturbed connection to connection box; check connection.
"MV-OFL A"
"MV-OFL B" The pH value is outside the measuring range (Overflow).
"REC-OFL 1"
"REC-OFL 2" At the corresponding recorder output there is an overflow.
"TEMP OFL A"
"TEMP OFL B" The corresponding measured value is outside the measuring range
(Overflow).
"UL pH A"
"UL pH B"
"LL pH A"
"LL pH B"
"UL pH DIFF"
"LL pH DIFF"
"UL mV A"
"UL mV B"
"LL mV A"
"LL mV B"
"UL mV DIFF"
"LL mV DIFF"
"UL TEMP A"
"UL TEMP B"
"LL TEMP A"
"LL TEMP B"
"UL TEMP DIFF"
"LL TEMP DIFF"
The corresponding control point of a limit value relay is overflown (UL)
or underflown (LL).
"SENS DEF A"
"SENS DEF B" The corresponding electrode is defective.
(see instruction manual of electrode).