IRIS MODEL 700/800 APPLICATION MANUAL
PAGE 4
GENERAL DESCRIPTION
The IRIS Model 700AC, Model 700DC and Model 800
are single-channel, fail-safe, flame monitoring systems.
They offer easy setup, excellent discrimination, and
high reliability.
Components are interchangeable between the 700 and
800 families. Any viewing head in the two families will
work with any of the signal processors.
Three signal processor models are available:
Model 700AC Universal AC powered
Model 700DC 24VDC powered
Model 800 Universal AC powered
The two Model 700 signal processors are very similar,
with 12 push-buttons, a two-digit numeric display, and
four LED status indicators to communicate with the
operator. The only difference between the two is that
one accepts AC power and the other accepts DC power.
Most of the signal processor connections are made
through high quality, Phoenix plug-in connectors. Com-
munications connections are made through modular
phone jacks at the top of the signal processors (Fig-
ures 1 - 4).
The Model 800 signal processor is quite small (Figure
5), having only one push-button and two LED indicators.
Setup is achieved by using a computer running the sup-
plied application software, or with the IRIS programmer
and cable, available separately. An RS-232 communica-
tions cable, also available separately, is connected from
the computer to the input labelled PROGRAM on the
front of the Model 800. Using the software, you can set
gains, adjust set points, and perform other setup and moni-
toring functions. The other signal processor connections
to the Model 800 are made through 12 Phoenix screw
terminals. (Figure 6)
All three signal processor models mount on a standard
35 mm DIN rail. They snap into place and may be re-
leased from the rail using a flat screwdriver.
There are basically two types of viewing heads -IR/
flicker-sensitive and UV-sensitive- but the various fea-
tures offered result in nine different models due to pack-
aging variations.
The S702 and S706 viewing head housings are larger
in diameter, are made of aluminum, and are secured
with over-center latches to their mounting blocks (Fig-
ure 7). In contrast, the S802 and S806 viewing head
housings are smaller in diameter and are made of stain-
less steel (Figure 8). An 800 series viewing head is se-
cured in its mounting block by a friction twist-lock simi-
lar to those used to lock the legs of camera tripods.
The IR/flicker sensitive viewing heads have a high pass-
filter that passes flicker frequencies above 33 Hz, but
an alternative high-frequency filter that passes only fre-
quencies above 155 Hz is available. These models are
identified by adding “-HF” to the model number. The
UV models respond to the absolute level of UV radia-
tion - not UV flicker - so there is no filter option.
The standard connector supplied with both the 700 and
800 viewing head models has two indicator LEDs in-
side it: the green one to indicate signal pulses (helpful in
alignment), and an orange one to indicate activity on
the self-check line (Figure 12). The green LED also
flashes once per second when the orange LED is pulsed
as the viewing head sends an ID code back to the sig-
nal processor. Figures 9 and 10 show, for reference, a
molded connector with cable which has been discontin-
ued. Model 700 viewing heads are also available with
a ½” pipe fitting for connecting to electrical conduits.
The four connecting wires exit through an epoxy seal in
the ½” pipe fitting (Figure 11). The LED indicators are
not present in the pipe-fitting option.
The available models are as follows:
S702 Basic IR/flicker model
S702-HF IR/flicker with high frequency
filter
S702-PF IR/flicker with pipe fitting
S702-HF-PF IR/flicker with HF filter & pipe
fitting
S706 Basic UV model
S706-PF UV with pipe fitting
S802 Basic IR/flicker model
S802-HF IR/flicker with high frequency
filter
S806 Basic UV model
The viewing heads, the viewing head connector, and the
cable provided are watertight, and have NEMA 4 and
4X ratings when the connector is tightened with pliers
and the cable is protected from UV.
The availability of both UV-sensing and IR/flicker-
sensing viewing heads ensures that the Model 700 and
Model 800 flame monitoring systems can provide good
discrimination in virtually any application. UV sens-
ing is appropriate for monitoring the burning of light
oil and especially for the burning of natural gas. IR/
flicker sensing is appropriate for monitoring heavy oil
and coal flames.
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