AMD Switch M21 User Manual

AMD Limit Switch  
For Series  
instrumentation  
for fluids  
M21 / ADI15  
Instructions Manual  
C-MI-AMDM21/ADI Rev.: 0  
English version  
 
3
In some instruments such as some models of  
ADI series, instead of having a connector, there  
is a cable gland with a cable with three colours  
(brown, blue and green/yellow). In this case the  
connections should be made as follows:  
No connection  
2
1
_
(Blue)  
Green/yellow  
Brown  
Blue  
= Earth  
= +  
+
Earth  
(Brown)  
=
-
MAINTENANCE  
1. Change of the vane position respect the limit switch  
AMD-MAXIMUM  
Place the limit switch indicator in the required  
scale value, fixing it by means of the 2 screws.  
After that, move manually the shaft that  
supports the indicator needle, until the indicator  
needle coincides with the maximum limit switch  
indicator. After that, loosen the grub screw (1.5  
mm Allen key) of the vane and make point 1  
coincide with the centre of the detector ( Figure  
3 ).  
1
2
1
2
Tighten the screw to fix the vane.  
Figure 3  
Figure 4  
AMD-MINIMUM  
The process is the same as for the maximum  
point, but making the point 2 coincide with the  
centre of the detector ( Figure 4 ).  
In the event that the instrument has two limit switches, the working range will be limited to the  
following values:  
From 0 to 25% of the scale, for the AMD of the minimum limit switch.  
From 75 to 100% of the scale, for the AMD of the maximum limit switch.  
2. Electrical verification of the limit switch  
a) Check that the voltage at the terminals 1 and 2 is over 7.5 V when the vane is in the slot.  
Connect a multimeter with the scale in DC mA, in series with the terminal 2.  
b) Verify that the current is less than 1 mA when the vane is in the slot, and more than 3 mA when  
the vane is out of the slot.  
If you don’t have the NAMUR amplifier, the current can be checked using the following circuit  
diagram:  
1 k  
2
Multimeter  
mA  
+
+
-
+
9V Battery  
(8.2V Nominal for  
NAMUR )  
AMD  
1
-
-
If you don’t have the detector, the operation of the amplifier can be checked using the following  
circuit diagram:  
3
 
+
Multimeter  
mA  
-
+
NAMUR  
Connection  
Amplifier  
Potentiometer 20 kΩ  
-
With the potentiometer we modify the current of the NAMUR amplifier. The switching point must be  
between 1.2 mA and 2.1 mA. That is, with the current below 1.2 mA the output relay must have a  
state and above 2.1 mA the output relay must have the other state.  
TECHNICAL CHARACTERISTICS  
The AMD is a NAMUR (DIN 19234) sensor with the following nominal characteristics:  
Nominal voltage  
8.2 V  
Power supply internal resistance  
Current with the vane into the slot  
Current with the vane out of the slot  
1 kΩ  
< 1 mA  
3 mA  
Power supply limits  
Ambient Temperature  
Self inductance  
5 ... 25 VDC  
-25 ... +100 ºC  
160 µH  
Self capacity  
20 nF  
Conforms with the Directive EMC 89/336/EEC  
WARRANTY  
Tecfluid S.A. GUARANTEES ALL ITS PRODUCTS FOR A PERIOD OF 24 MONTHS, after  
consignment, against all defects in materials and workmanship.  
This warranty does not cover failures which can be imputed to misuse, use in an application different  
to that specified in the order, the result of service or modification by un-authorized persons, bad  
handling or accident.  
This warranty is limited to cover the repair or replacement defective parts which have not been  
damaged by misuse.  
This warranty is limited to the repair of the equipment and all further and eventually following  
damages are not covered by this warranty.  
Any consignment of equipment to our factory or distributor must be previously authorised. The  
consignment should be done with the equipment well packed, clean of any liquids, grease or  
hazardous materials. Tecfluid S.A. will not accept any responsibility for damage done during  
transport.  
Together with the equipment, a note should be enclosed indicating the failure observed, the name,  
address and telephone number of the sender.  
TECFLUID, S.A.  
Narcís Monturiol, 33  
E-08960 Sant Just Desvern  
Tel. + 34 93 3724511 - Fax + 34 93 4734449  
The technical data in this document is subject to modification without notification, if the technical innovations in the product or  
manufacturing processes so require.  
 

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