Emerson Bettis Q Series Installation Manual page 16

Bettis Q-Series
February 2017
11 Intrinsically Safe Electrical connections
11.1 Product QC44.xP1Nxx1
This section is about intrinsically safe connections
for the QC44 control module with the N-type
switches.
Terminals
Control Module
Cover
Fig 11.1 Product marking
ATEX Hazardous or Classified Location
0344 Certificate: Pending
II 1 G Ex iaT*
II 1 G Ex tD A20 T80°C IP65
Hazardous or Classified Location
Intrinsically safe, Class I, II, III, Division 1,
Groups ABCDEFG T*, Type 4X
Ex ia IIC, T*, IP65
DIP A20 TA 80°C
Certificate: Pending
Temperature range T*:
Table 11.1 Temperature class
T ambient at T class:
Connection
T6 (°C)
Type 1 40
Type 2 33
Type 3 12
Note:
The Connection Type refers to the entity parameters of the IS barriers
used for connection of the switches, See Table 11.2.
For double-acting Fail in Last Position, Only T4 to T1 are applicable with
Maximum Ambient Temperature = 50˚C.
16
Type Label
T5 (°C) T4 – T1 (°C)
60 60
53 60
32 49
11.1.1 ATEX Intended use
The Control Module QC44.xP1Nxx1 of the Bettis
Q-Series pneumatic actuator is Group II category 1
equipment and intended for use in areas in which
explosive atmospheres caused by mixtures of air
and gases, vapours, mists or by air/dusts are likely
to occur.
The pneumatic actuator part, together with the
pneumatic Module part of the Bettis Q-Series pneu-
matic actuators is a Group II category 2 equipment
and intended for use in areas in which explosive
atmospheres caused by mixtures of air and gases,
vapours, mists or by air/dusts are likely to occur.
Therefore it may be used in (ATEX) classified Zones
1, 2 (Gasses) and/or 21, 22 (Dust).
11.1.2 Special conditions for safe use
• The material for the Control Module housing is
an aluminum alloy. When the unit is used in a
potentionally explosive atmosphere, requiring
ATEX equipment category 1 G, the unit must be
installed in such a way, that even in the event of
rare incidents, an ignition source due to impact
or friction between the enclosure and iron/steel
is prevented.
• Only non-combustible fluids may be used in the
pneumatic circuit.
Note: the surface temperature of the module has
been determined without a dust layer.
• Potential electrostatic charging hazard, clean
only with a damp cloth - danger of propagating
discharge.
• The apparatus shall be installed in such a way
that the risk from electrostatic discharges and
propagating brush discharges caused by rapid
flow of dust is avoided.
• Precaution shall be taken to avoid danger of
ignition due to electrostatic charges on the
marking plate of the enclosure.
Table 11.2 QC44 Intrinsically Safe Entity
Parameters
Circuit Terminal Ui
Pilot
8 - 9 28Vdc 300mA
valve
Feedback switches 1 & 2
Type 1 1 – 2, 4 - 5 16Vdc
Type 2 1 – 2, 4 - 5 16Vdc
Type 3 1 – 2, 4 - 5 16Vdc
Installation Guide
DOC.IG.BQC44.1 Rev. 1
Ii Pi Ci
1.6W 0
25mA 34mW 150nF 150uH
25mA 64mW 150nF 150uH
52mA 169mW 150nF 150uH
Li
0