S+S Regeltechnik THERMASGARD RTF PLT Série Notice D'instruction page 15

G
Mounting and Installation
Devices are to be connected under dead-voltage condition. Devices
must only be connected to safety extra-low voltage. Consequential
damages caused by a fault in this device are excluded from warranty
or liability. Installation of these devices must only be realized by au-
thorized qualified personnel. The technical data and connecting condi-
tions shown on the device labels and in the mounting and operating
instructions delivered together with the device are exclusively valid.
Deviations from the catalogue representation are not explicitly men-
tioned and are possible in terms of technical progress and continuous
improvement of our products. In case of any modifications made by
the user, all warranty claims are forfeited. Operating this device close
to other devices that do not comply with EMC directives may influence
functionality. This device must not be used for monitoring applica-
tions, which solely serve the purpose of protecting persons against
hazards or injury, or as an EMERGENCY STOP switch for systems or
machinery, or for any other similar safety-relevant purposes.
Dimensions of enclosures or enclosure accessories may show slight
tolerances on the specifications provided in these instructions.
Modifications of these records are not permitted.
In case of a complaint, only complete devices returned in original
packing will be accepted.
G
Resistance characteristics of passive temperature sensors (see last page)
In order to avoid damages ⁄ errors, preferably shielded cables are to be used.
Laying measuring cables parallel with current-carrying cables must in any case be avoided. EMC directives shall be observed!
These instruments must be installed by authorised specialists only!
Limiting deviation according to classes:
Tolerances at 0 °C:
Platinum sensors (Pt100, Pt1000):
DIN EN 60751, class B ................................................................± 0.3 K
1 ⁄ 3 DIN EN 60751, class B ........................................................± 0.1 K
Nickel sensors:
NI1000 DIN EN 43760, class B .................................................± 0.4 K
NI1000 1 ⁄ 2 DIN EN 43760, class B.........................................± 0.2 K
NI1000 TK5000 ...........................................................................± 0.4 K
Notes regarding mechanical mounting and attachment:
Mounting shall take place while observing all relevant regulations and
standards applicable for the place of measurement
(e.g. such as welding instructions, etc.). Particularly the following shall
be regarded:
– VDE ⁄ VDI directive technical temperature measurements, meas-
urement set - up for temperature measurements.
– The EMC directives must be adhered to.
– It is imperative to avoid parallel laying of current-carrying lines.
– We recommend to use shielded cables with the shielding being at-
tached at one side to the DDC ⁄ PLC.
Before mounting, make sure that the existing thermometer's techni-
cal parameters comply with the actual conditions at the place of
utilization, in particular in respect of:
– Measuring range
– Permissible maximum pressure, flow velocity
– Installation length, tube dimensions
– Oscillations, vibrations, shocks are to be avoided (< 0.5 g)
Attention! In any case, please observe the mechanical and thermal
load limits of protective tubes according to DIN 43763 respectively
according to specific S+S standards!
ATTENTION, NOTE !
Testing current influences the thermometer's measuring accuracy
due to intrinsic heating and therefore, should never be greater than
as specified below:
Standard values for testing current:
Sensor current, maximum ................................................................. I
Pt100, Pt1000 (thin-layer) ................................................ < 0.1 - 0.3 mA
Ni1000 (DIN), Ni1000 TK5000 .................................................... < 2 mA
NTC´s ................................................................................................ < 1 mA
LM 235 ............................................................................... 400 µ A ... 5 mA
15
max.