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figure 24: Typical mi identification tag
(for use in hazardous areas)
MI Unit Reference: B/HSQ1M1000/43M/1187/230/2M/SC1H2.5/X/M20/EX
Heating Cable Ref.:
Year of Manufacture:
Grade:
Design Method:
Max. Sheath Temperature: 331°C
Nom. Power Output @ 230 V: 1187 W @ Maintain Temperature
Order No:
Batch number:
Type Examination No:
Follow installation and operating instructions for safe 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.
HSQ1M1000
2006
(high)
Limiter-Lockout
XXXXXX
Baseefa02ATEX0046X
2 G
EEx e
THIS TAG MUST NOT BE REMOVED
Element Length:
Circuit Length (if different):
Design Temperature Class: T1 Zone1
Maximum Withstand Temperature: 450°C
Sheath Reference Temperature: 200°C
Customer Order No:
Circuit Reference:
T1
1180
43 m
29
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