SensoGate WA131MH
18
2.7 Limit Positions
2.7.1 SERVICE and PROCESS Position
SensoGate WA131MH can assume two limit positions (SERVICE or PROCESS position).
SERVICE position
• The sensor is not in contact with the process medium.
• The sensor can be installed, removed, and, as necessary, cleaned while the process is running.
• The measuring system can be calibrated and adjusted.
PROCESS position
• The sensor is in contact with the process medium.
• The desired process parameters can be measured.
When using versions of SensoGate WA131MH with electronic limit signal, a contact is closed when a
limit position is reached at the limit switch. An electrical signal, e.g. at the control center, can be dis-
played when the limit position is reached.
The limit positions are indicated in different ways depending on the version of SensoGate WA131MH
used.
Solid-electrolyte sensor,
short immersion depth
Liquid-electrolyte sensor,
short immersion depth
1
2
3
1
2
4
SERVICE
PROCESS
SERVICE
PROCESS
In the SERVICE position, the sensor head
(3)
is visible at
the top end of the protection sleeve.
In the SERVICE position, the bellows
(4)
are expanded.
In the PROCESS position, the sensor head
(3)
is retracted
into the protection sleeve.
In the PROCESS position, the bellows
(4)
are compressed.
In both limit positions, the rotating collar
(2)
is locked
and the safety lock button
(1)
is not depressed.
In both limit positions, the rotating collar
(2)
is locked
and the safety lock button
(1)
is not depressed.
