SECTION 2, continued
29
Figure 11 Voltage Selector Switch and Fuse Replacement
2.8.4 Alarm Connections
The alarm set points are governed by the reagents used in the instrument. Refer to
Section 3.2 on page 35 to select the appropriate buffer and indicator reagents.
Note: Current to the relay contacts
must be limited to 5 amps. A method
to remove power from the relays
locallymustbeavailableincaseof
an emergency or for servicing of the
product. Power removal can be
accomplished with an external
switch and a 5-amp fuse or with a
switched 5-amp circuit breaker.
The alarm relay contacts are connected to the terminal strip in the customer wiring
compartment, providing both normally open and normally closed terminations.
Terminals are unpowered and rated for 5 A, at 100–240 Vac resistive load. Refer
to Figure 13 and the instructions that follow for connection information.
The relay connector accepts 18-12 AWG wire. Wire gauge should be determined
by load application. Wire gauge less than 18 AWG is not recommended.
1. Make sure no power is supplied to the instrument.
2. Strip the insulation on each wire back ¼-inch. See Figure 12.
3. Insert the wire end into the connector until the insulation seats against
the connector. (Do not seat the insulation under the terminal pinch plates.)
4. When connections are complete, supply power to the instrument.
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