O & M Manual
Revision C (7/09)
- 19 -
Part 4 – Electrical Installation
4.1
General
The Q45 is powered in one of two ways, depending on the version purchased.
The 2-wire version is a 16-35 VDC powered transmitter. The integral 115/230
VAC version requires line power. Please verify the type of unit before connecting
any power.
WARNING: Do not connect AC line power to the 2-wire module.
Severe damage will result.
Important Notes:
1. Use wiring practices that conform to all national, state and local
electrical codes. For proper safety as well as stable measuring
performance, it is important that the earth ground connection be made
to a solid ground point from terminal 12 (Figure 4-1). The AC power
supply in the transmitter, contains a single 100mA (115V) or 50mA
(230V) slo-blo fuse. The fuse is located adjacent to
TB5
and is easily
replaceable.
2. Do NOT run sensor cables or instrument 4-20 mA output wiring in the
same conduit that contains AC power wiring. AC power wiring should
be run in a dedicated conduit to prevent electrical noise from coupling
with the instrumentation signals.
3. This analyzer must be installed by specifically trained personnel in
accordance with relevant local codes and instructions contained in this
operating manual. Observe the analyzer's technical specifications and
input ratings. Proper electrical disconnection means must be provided
prior to the electrical power connected to this instrument, such as a
circuit breaker - rated 250 VAC, 2 A minimum. If one line of the line
power mains is not neutral, use a double-pole mains switch to
disconnect the analyzer.
4.2
Two-Wire
In the two-wire configuration, a separate DC power supply must be used to
power the instrument. The exact connection of this power supply is dependent
on the control system into which the instrument will connect. See Figure 4-1 for
further details. Any twisted pair shielded cable can be used for connection of the
instrument to the power supply. Route signal cable away from AC power lines,
adjustable frequency drives, motors, or other noisy electrical signal lines. Do not
run sensor or signal cables in conduit that contains AC power lines or motor
leads.
