M&C TechGroup LA 1.4 Operator's manual - Manual (Page 8)

8
Gas sampling and conditioning technology 5-5.1.1-ME
9 DESCRIPTION
The M&C liquid sensors LA..S works on the principle of electrical conductivity from 20 µS/cm
conductance. In order to avoid electrolytic effects on the sensor surface, the sensors are powered with
alternating current.
N O T E !
Only the newly developed electronic controllers as described in the afore
mentioned data sheet from date of construction 04/2006 onwards can be
used for the M&C liquid sensors LA..S.
The M&C LA..S liquid sensors are constructed in such a way that any droplets of liquid in the sample
gas are attracted under gravity to the sensor surface and even the smallest liquid droplets trigger a
sure and rapid alarm.
The LA 1S sensor is defined for operating pressure up to 4 bar and LA 25S for up to 25 bar. The
sensor protection corresponds to type IP65 EN 60529.
The LA 1S sensor with its 12 mm diameter glass body is mounted in the GL connection of a F..-..-D
universal filter or in the LS flow chamber. The LA 25S sensor has got a 1/4" special male connector
for mounting in the FSS..-D universal filter or for mounting in 8 mm tubes using a special union tee
connector LS 25.
When mounting the universal filters and the flow chamber, the gas inlet and gas
outlets can be rotated through 180° during assembly.
Two mounting types are available, wall-mounting LA1.1 and rail-mounting LA1.4.
A line break supervision is integrated for sure operation. There are two LED’s for displaying
operational and fault status as well as two potential-free changeover contacts with "safety-first"
switching action for sure alarm signalling. The electronic controllers are equipped with an alarm reset
that may be activated or deactivated. During delivery, it is not activated.
By using one of the contacts, a pump or a solenoid valve in the gas conditioning system can be
switched directly and the second contact can be used as a status alarm.
The switching point of the electronic controller LA-1.. is adjustable via a potentiometer. At works, a
standard alignment is made for a conductivity of 100µS/cm.
A T T E N T I O N ! The special electronic controller ER142 Exi (without line break controller)
(Part No.: 03E2009 (a)) must only be used for the intrinsically safe feeding
of the old sensor versions LA 1 or LA 25 being installed in the EX-zone.
For application in combination with the new sensor versions LA 1S and
LA 25S no explosion protection is provided!
10 RECEIPT OF GOODS AND STORAGE
The liquid alarm series LA ® are normally delivered in 2 packing units:
1. Universal filter F.-..-D or flow chamber LS and liquid sensor LA ..S
2. Electronic controller LA-1...

Please take the liquid alarm units LA... and eventual special accessories carefully out of the
packaging material immediately after arrival, and compare the goods with the items listed on the
packing list.

Check the goods for any damage caused during delivery and, if necessary, notify your transport
insurance company without delay of any damage discovered.