figure 24: Typical mi identification tag
(for use in hazardous areas)
– mi unit reference
is the order reference following the nomenclature
of MI heating units (also see page 6)
– heating Cable ref
. is the type of MI heating cable
– element length
is the heated length of the MI unit
– Year of manufacture
is the manufacturing year
– Circuit length (if different)
informs about the “total circuit length” in
case of multiple elements being connected in series
– Design Temperature Class
states the “T-class” or “Auto Ignition
Temperature” including the “Zone” classification, which the unit is
designed for
– Design method
informs about the method of temperature control,
which has been used for the design and must be installed to control
the heating unit.
examples:
1) “Stabilized” indicates that the design method used is “stabilised
design”. All parameters used in the design of the application must be
respected in order to comply with the hazardous area requirements
(e.g. pipe diameters, insulation thickness, process, ambient
conditions ...). The reference temperature for the sheath temperature
calculations is either the calculated “max. uncontrolled temperature”
or the “max. process temperature”, whichever is higher.
2) “Control limited” indicates that the design method used is
“control limited design”. The reference temperature for the sheath
temperature calculations is the control limited set point and must be
assured by the use of an alarm capable control unit making sure the
heating element is switched off, when the pipe/equipment exceed this
temperature. The use of a wrong control device or a change of the
temperature setting will invalidate the design calculation.
3) “Limiter-Lockout” indicates that the design method used assumes
the installation of an approved limiter (typically a safety temperature
limiter which sensor is installed on the heating cable surface using
an “artificial hotspot”). The set point of the limiter must be below the
T-class of the area and may require an additional down-adjustment
for potential falsifying of the measured temperature, refer to the
instructions given by the manufacturer of the limiter.
MI Unit Reference:
B/HSQ1M1000/43M/1187/230/2M/SC1H2.5/X/M20/EX
Heating Cable Ref.:
HSQ1M1000
Element Length:
43 m
Year of Manufacture: 2006
Circuit Length (if different):
Grade:
(high)
Design Temperature Class: T1 Zone1
Design Method:
Limiter-Lockout
Maximum Withstand Temperature: 450°C
Max. Sheath Temperature: 331°C
Sheath Reference Temperature: 200°C
Nom. Power Output @ 230 V: 1187 W @ Maintain Temperature
Order No:
Customer Order No:
Batch number:
XXXXXX
Circuit Reference:
Type Examination No:
Baseefa02ATEX0046X
THIS TAG MUST NOT BE REMOVED
Follow installation and operating instructions for safe use in hazardous areas!
2 G EEx e T1
1180
29
