4.1.8 Remote reset
The BA367E-SS Counter's total display may be
remotely reset to zero by connecting terminals RS1
& RS2 together for more than one second.
Permanent interconnection inhibits counting.
Remote resetting may be accomplished by any
mechanically operated switch located in the same
hazardous area as the Counter providing it and the
associated wiring can withstand a 500V rms
insulation test to earth. No Zener barrier is required.
A BA367E-SS may also be remotely reset from the
safe area. Any switch may be used but a Zener
barrier is required to transfer the contact closure into
the hazardous area which may be combined with the
supply barrier so that only one package is required.
A diode return barrier is not suitable for this
application. Fig 2 illustrates how the BA367E-SS
may be reset from both the safe and the hazardous
area.
Note:
The BA367E-SS can be configured to reset
the total display when the
&
and
*
push buttons
are operated simultaneously for more than two
seconds - see 6.19.
4.2
Use with Galvanic Isolators
Galvanic isolators are probably the simplest
intrinsically safe interface to install as they provide
isolation and do not require a high integrity earth
connection.
Any certified galvanic isolator with output parameters
less than the input parameters of the BA367E-SS
having the correct function may be used.
Fig 4 BA367E-SS protected by galvanic isolators.
Fig 4 illustrates the basic circuit that is used for all
BA367E-SS Counter installations protected by
galvanic isolators. For simplicity, connections for
the optional alarms, pulse output and 4/20mA output
are shown separately in section 9 of this manual.
Fig 5 BA367E-SS protected by galvanic isolators.
pulse source in safe area.
Alternatively the pulse source may be located in the
safe area. Fig 5 shows how an additional galvanic
isolator is used to transfer the signal to the BA367E-
SS Counter in the hazardous area, although it may
be difficult to find isolators for some sensors.
4.2.1 Power supply
The BA367E-SS Counter requires a minimum of 10V
between terminal 1 & 2 and consumes:
10mA
without optional backlight
plus
22mA
for optional backlight
plus
6mA
when terminals 3 & 4 are linked
Any certified galvanic isolator may be used to power
a BA367E-SS Counter providing the output safety
parameters of the isolator are equal to or less than
the input safety parameters of terminals 1 & 2.
These requirements are not restrictive and allow a
wide range of galvanic isolators, such as solenoid
drivers, to be used.
12
Summary of Contents for BA367E-SS
Page 1: ...Issue 6 9th July 2019 BA367E SS Rugged one input Intrinsically safe Counter Issue 6 ...
Page 4: ...4 ...
Page 22: ...22 ...
Page 23: ...23 ...
Page 47: ...47 ...
Page 48: ...48 ...
Page 49: ...49 ...
Page 50: ...50 ...
Page 51: ...51 ...
Page 52: ...52 ...
Page 53: ...53 ...
Page 54: ...54 ...
Page 55: ...55 ...
Page 56: ...56 ...
Page 57: ...57 ...
Page 58: ...58 ...