Tecsis TM820 Mode D'emploi page 3

Electrical switch contacts
with Magnetic snap-action or Sliding contacts
temperature gauges or Magnetic snap-action
in pressure gauges
Examples:
Thermometer
Model TM820
Contents
1. Safety instructions
2. Description, Application
3. Mechanical connection
3.1 Special requirements for the installation point
4. Wiring details
5. Setting the desired value indicator
6. Ingress protection IP
7. Admissible ambient temperatures
8. Maintenance and servicing/Cleaning
9. Repairs
10. Power ratings
11. Overcurrent protection devices
12. Switch version appropriate to gauge type
and range
1. Safety instructions
The appropriate national safety regulations
(i.e. VDE 0100) must be observed when
installing, commissioning and operating these
instruments.
Do not work on gauge while under voltage.
Serious injuries and/or damage can occur should
the appropriate regulations not be observed.
The gauges are no safety accessories as defined by the
Pressure Equipment Directive 97 / 23 / EC.
Only appropriately qualified personnel should work on these
instruments.
2. Description, Application
The built-in electric switch contacts (magnetic snap-action or
sliding) are auxiliary current switches which open and close
the connected electrical circuits at the set points via the
contact arm, which is driven by the main instrument pointer.
3. Mechanical connection
According to the general technical regulations for pressure
gauges and temperature measuring instruments, respectively
(i.e. EN 837-2 or EN 13 190). When screw-fitting the gauges
the force required for this must not be applied through the
case or terminal box but just through the spanner flats
(with suitable tool) provided for this purpose.
Installation with
spanner
With safety pattern gauges (see dial symbol
pay attention to the fact that the free space behind the blow-
out back will be at least 15 mm.
Operating Instructions GB
Pressure Gauge
Model P2361
) you need to
3.1 Special requirements for the installation point
Instruments must be mounted in a location free from vibra-
tion in order to avoid contact chatter and the resulting incre-
ased wear. If the measuring point is not adequately stable a
measuring instrument holder should be used for fastening
(and possibly via a flexible capillary line). If the pressure gau-
ge is exposed to vibration or pulsating pressure or both, then
a liquid filled pressure gauge may provide considerably better
performance and readability.
Instruments should be protected against coarse dirt and wide
fluctuations in ambient temperature.
4. Wiring details
The electrical connections should be made by qualified elec-
tricians. Connection details and switch functions are given on
the instrument type plate. Connection terminals and ground
terminal are appropriately marked.
The mains connection lines to be provided must be dimensio-
ned for maximum instrument power consumption and comply
with IEC 227 or IEC 245.
Power ratings and overcurrent protection devices see over-
leaf.
5. Setting the desired value indicator
The setting of the set point is achieved using the adjustment
lock in the window with the aid of the adjustment key (part
of the scope of supply; found in standard instruments on the
side of the terminal box).
Set point
indicators
(red set pointer)
Adjustment lock
The set point indicators for the alarm contacts are freely
adjustable over the full scale range. For reasons of switching
accuracy and long life of the mechanical measuring system,
the switching points should be between 10 % and 90 % of the
measuring range.
6. Ingress protection IP
The type of enclosure to EN 60 529 for protection against
external influences depends on the basic instrument and is
found in the respective data sheet.
7. Admissible ambient temperatures
The permissible ambient temperatures for alarm contacts is
-20 to +70°C. Where this span exceeds the permissible tem-
perature limits for the instrument to which the contacts are
fitted, the limits for the instrument apply (see data sheet).
8. Maintenance and servicing / Cleaning
The instruments require no maintenance or servicing.
The indicator and switching function should be checked once
or twice every 12 months. The instrument must be discon-
nected from the process to check indication with a pressure
or temperature testing device.
The instruments should be cleaned with a damp cloth mois-
tened with soap solution. For cleaning inside the instrument
the mains power supply should be disconnected by means of
the plug box or plug connection.
It must be ensured that all the parts are dry before the power
is switched on again.
9. Repairs
Repairs are to be only carried out by the manufacturer or
appropriately trained personnel.
For further details see data sheet DD/DE 1231 or the type
sheet for the respective basic gauge.
Removable
adjustment key