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...2 INSTALLATION
2.6 External Electrical Connections –
Figs. 2.3 to 2.5
Warning.
• Although certain instruments are fitted with internal fuse
protection, a suitably rated external protection device,
e.g. a 3 A fuse or miniature circuit breaker (m.c.b.), must
also be fitted by the installer.
• The power supply earth (ground) must be connected to
ensure safety to personnel, reduction of effects of radio
frequency interference (r.f.i.) and correct operation of
the power supply interference filter.
• Before making any connections, ensure that the power
supply, any high voltage-operated control circuits, high
common mode voltages, including externally powered
alarm circuits, are switched off.
Caution. Slacken the terminal screws fully
before making connections.
The external electrical connections are in the electronic
section, behind the hinged cover and beneath the R.F. screen
– see Fig. 2.3. The cables are passed through the cable
glands on the right hand side on the monitor case and
connected as follows:
•
Mains input (power supply) – 115 V (110 to 120 V) or
230 V (220 to 240 V). The mains voltage is selected using
the voltage selector – see Fig. 2.3.
•
Single-Stream – CURRENT OUTPUT 1 and 2 – two
independent current outputs for external recording or control.
Multi-Stream – CURRENT OUTPUT 1 to 6 – one current
output per stream.
Voltage Selector
(115 V or 230 V)
Power Supply Unit
(P.S.U.)
Fig. 2.3 Mains Input Connector Block and Voltage Selector Locations
6
the negative terminal MUST be connected to earth
(ground) if connecting to the isolated input of another
device.
The setting of the range of the current output is covered on
Programming Page 4 (see Section 6.4).
•
The 'Out of Sample' alarm relay can be used as a remote
indication or to operate a pump or filter change over sequence.
•
•
•
pole change over contacts.
Mains Input (power supply)
Connector Block
Motherboard
Information. Because the current output is isolated,
Single-Stream:
RELAY 1 and 2 –
two Concentration alarm relays.
RELAY 3
–
'Out of Sample' alarm relay.
Multi-Stream:
RELAYS 1 to 6
–
one relay per stream configurable
to be concentration or 'Out of
Sample' alarm relays.
CALIBRATION – remote calibration mode indication alarm
relay. This indicates when the instrument is off-line during a
calibration – see Section 7.
OUT OF SERVICE – remote instrument 'Out of Service'
indication alarm relay. This indicates that the monitor
readings are suspect and it is in need of attention – see
Section 8.4.
SERIAL – Optional serial interface (see supplementary
instruction manual for details).
Information. All relays have voltage-free single
L
N
E
Note. To
connector blocks first undo the
10 fixing screws and remove the
R.F. screen.
Connector Blocks
(See Figs. 2.4 & 2.5)
Important Note. Replace
and secure the R.F. screen
before operating this equipment.
R.F. Screen
access
the
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