BEKA BA454D, Manual

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Having a temperature classification of:
T1 450oC
T2 300oC
T3 200oC
T4 135oC
T5 100oC
At an ambient temperature between –40 and
+60
o
C.
Note : the guaranteed operating temperature
range of the batch controller is –20 to +60
o
C
This allows the BA454D to be installed in all
Zones and to be used with most common
industrial gases.
3.3 Power supply
When installed in a hazardous area the
BA454D must be powered from a EEx ia IIC
certified Zener barrier or galvanic isolator
having output parameters equal to or less than:
Uo = 28.0V dc
Io = 96mA dc
Po = 0.84W
The maximum equivalent capacitance and
inductance between power supply terminals 1
and 2 is:
Ci = 0.015µF
Li = 8µH
To determine the maximum permissible cable
parameters, Ci and Li must be subtracted from
the maximum cable capacitance and
inductance specified by the certificate of the
barrier or isolator powering the batch
controller.
3.4 Inputs
The BA454D has two alternative inputs.
Input 1 (terminals 11 & 12) is for devices that
require powering by the batch controller such
as switch contacts, a proximity detector or a
photodetector. Input 2 (terminals 13, 14, 15,
16 & 17) complies with the requirements for
simple apparatus and is for the connection of
devices having a voltage or current output
such as a magnetic pickup or an analogue
4/20mA current.
Note: Inputs 1 and 2 can not be used
simultaneously.
3.4.1 Input 1
Terminals 11 and 12 may be connected to any
transducer having input parameters equal to or
greater than:
Ui = 10.6V dc
Ii = 20mA dc
Pi = 0.05W
The terminals may also be connected to any
device such as a switch contact complying with
the requirements for
simple apparatus as
specified in Clause 5.7 of EN 60079-11.
The maximum permitted capacitance and
inductance for the cable plus the transducer
connected to terminals 11 & 12 in a IIC
hydrogen gas are:
C cable + Ci transducer

2.3µF max
L cable + Li transducer

90mH max
See system certificates for maximum limits for
IIB and IIA gases.
3.4.2 Input 2
Terminals 13, 14, 15, 16 and 17 comply with
the requirements for
Simple Apparatus
allowing any device certified Ex ia IIC with
output parameters equal to or less than:
Uo

28V dc
Io

100mA dc
Po

0.66W
to be connected.
This allows devices with a certified voltage
pulse output or a certified 4/20mA analogue
current output to be connected directly to the
batch controller.
The maximum equivalent capacitance Ci and
inductance Li of terminals 13 to 17 is:
Ci = 0.018µF
Li = 0.02mH
To determine the maximum permissible cable
parameters, Ci and Li must be subtracted from
the maximum permissible cable capacitance
and inductance specified by the certificate for
the device connected to input 2.
See system certificates for maximum limits for
IIB and IIA gases.
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