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66-2069-02

The Honeywell Model 700ACSP and Model 700DCSP signal 

processors are single-channel, fail safe, flame monitoring 

systems when used In conjunction with the S70X/S80X 

viewing heads. They offer easy setup, excellent discrimination, 

and high reliability.

Viewing heads are interchangeable between the two signal 

processor models. Any viewing head in the two families will 

work with any of the signal processors.

Two signal processor models are available:

• Model 700ACSP   Universal 85-265 VAC powered, plus 

24VDC backup. 

• Model 700DCSP   22-26VDC powered, plus 24VDC 

backup. 

The two Model 700 signal processors are similar, with 12 

push-buttons, a two-digit numeric display, and four LED status 

indicators for operator interface. The only difference between 

the two is that one accepts AC power and the other accepts 

DC power. Both models also accept 24VDC backup power. 

Most of the signal processor connections are made through 

Phoenix plug-in connectors. Communication connections are 

made through modular phone jacks located at the top of the 

signal processors (Fig. 8).

Both signal processor models mount on a standard 35 mm 

DIN rail. They snap into place and may be released from the 

rail using a flat screwdriver.

There are two types of viewing heads—IR/flicker-sensitive and 

UV-sensitive—with various features offered resulting in ten 

different models. See Table 1 on page 2 for details.

The S702 and S706 viewing head housings are larger in 

diameter than the S80X series, are made of aluminum, and 

are secured with over-center latches to their mounting blocks 

(Fig. 9). In contrast, the S802 and S806 viewing head 

housings are smaller in diameter and are made of stainless 

steel (Fig. 10). An 800 series viewing head is secured in its 

mounting block by a friction twist-lock.

The IR/flicker sensitive viewing heads have a high-pass filter 

that passes flicker frequencies above 33 Hz. Some models 

have a built-in high pass filter that only passes frequencies 

above 155 Hz. The high frequency filter models are identified 

by adding “HF” to the model number. The UV models respond 

to the level of UV radiation—not UV flicker—so there is no 

filter option.