HTS IFM – 700SP Signal Processor Series

Overview

The Honeywell Model 700SP Signal Processor Series consists of two single-channel, fail-safe, self-checking flame monitoring signal processors — the 700ACSP and 700DCSP — designed for use with the S70X and S80X series viewing heads. Both models provide reliable flame detection using either UV or IR sensing technology, and feature an intuitive 12-button keypad with a two-digit numeric display for easy on-site setup and configuration. All viewing heads in the S70X and S80X families are fully interchangeable between both signal processor models.

The 700SP series supports Modbus RS-422 communication for integration with Honeywell FlameTools software, the S7999D touchscreen interface, or other Modbus RTU-compatible host controls. Both models mount on a standard 35 mm DIN rail and connect via Phoenix plug-in terminal connectors, minimizing installation time. The system is rated fit for use in SIL 3 safety applications under a 1oo1 architecture with a proof test interval of 1 to 5 years.

Features & Benefits

• Single-channel, fail-safe, self-checking design — The self-check relay is wired in series with the flame relay, ensuring the flame relay cannot energize if the self-check relay is open, providing an added layer of safety against false flame-on conditions.
• Compatible with UV and IR viewing heads — S70X and S80X series viewing heads are fully interchangeable between both signal processor models, allowing flexibility across fuel types and application conditions.
• Intuitive keypad interface — Twelve push-buttons, a two-digit numeric display, and four LED status indicators allow on-site setup, setpoint adjustment, and automatic parameter configuration without additional tools or software.
• Automatic setup sequence — Built-in BNR-ON/BNR-OFF automatic setup routine calculates Relay On setpoint, Ratio %, and UV/IR gain from live burner data, reducing commissioning time.
• Isolated 0–20 mA or 4–20 mA analog output — Provides a proportional flame signal to remote meters or DCS inputs, with a maximum load resistance of 360 ohms.
• Modbus RS-422 communication — Supports up to 32 signal processors per bus, with compatibility for Honeywell FlameTools software and S7999D touchscreen for remote monitoring and configuration.
• Compact DIN rail mounting — Both models snap onto a standard 35 mm DIN rail and occupy only 3 inches of panel width. Phoenix plug-in terminal connectors simplify field wiring.
• 24 VDC backup power input — Both AC and DC models accept an optional 24 VDC battery backup, maintaining operation during primary power interruptions.
• Panel lock feature — Prevents unauthorized changes to stored setpoints after commissioning.
• SIL 3 rated — Both 700ACSP and 700DCSP are declared fit for use in SIL 3 low-demand safety applications per IEC 61508, with Safe Failure Fraction (SFF) greater than 99%.

Technical Specifications

• 700ACSP Input Power: 85–265 VAC, 50/60 Hz, 0.07A max.; optional 22–26 VDC backup, 0.2A max.
• 700DCSP Input Power: 22–26 VDC, 250 mA max.; optional 22–26 VDC backup, 0.5A max.
• Flame Relay Output: 2 Form C (SPDT) contacts, 5A at 125 VAC / 277 VAC / 30 VDC; 1/8 HP at 125 & 250 VAC
• Self-Check Relay Output: 1 Form C (SPDT) contact, same contact ratings as flame relay
• Analog Output: Isolated 0–20 mA or 4–20 mA, 360 ohms maximum load resistance
• Flame Failure Response Time (FFRT): Selectable — 1, 2, or 3 seconds
• Communication Protocol: Modbus RTU via RS-422; 9600 baud, 8 data bits, no parity, 1 stop bit; up to 32 units per bus
• Signal Processor Ambient Temperature: 32°F to 140°F (0°C to 60°C)
• Mounting: Standard 35 mm DIN rail; 3-inch panel width; plug-in Phoenix terminal connectors
• Display: Two-digit numeric display (flame count range 00–29); four LED status indicators
• UV/IR Gain: Adjustable 1–9; factory default 5
• Relay On Setpoint Range: 0–29 (display counts)
• Ratio % (Relay Off/Relay On): Adjustable 20%–80%; factory default 50%
• SIL Rating: SIL 3 fit for use; 1oo1 architecture; SFF >99%; proof test interval 1–5 years; MTTR 8 hours
• 700ACSP PFD_avg: 1.79 × 10⁻⁴ (5-year proof test interval)
• 700DCSP PFD_avg: 1.79 × 10⁻⁴ (5-year proof test interval)

Applications

• Industrial burner flame monitoring on single-burner systems requiring fail-safe, single-channel UV or IR detection
• Natural gas and light oil flame monitoring using UV-sensing S706 or S806 viewing heads
• Heavy oil and coal flame monitoring using IR/flicker-sensing S702 or S802 viewing heads
• Boiler and combustion systems requiring SIL 3-rated flame safeguard signal processing
• Multi-burner installations requiring networked flame monitoring via Modbus RS-422 (up to 32 loops)
• Applications requiring analog flame signal output to DCS, PLC, or remote metering systems
• Hazardous location installations (Class I, Division 2) when used with approved S70X/S80X viewing heads and rated cable assemblies

Models / Configurations

• 700ACSP – AC-powered signal processor; primary input 85–265 VAC (universal), 50/60 Hz; optional 22–26 VDC backup. For use where AC power is the primary supply.
• 700DCSP – DC-powered signal processor; primary input 22–26 VDC; optional 22–26 VDC backup. For use in DC-powered control panels or battery-backed systems.

Compatible Viewing Heads (S70X / S80X Series):

• S702 – IR/flicker-sensitive, connector type, aluminum housing; spectral response 950–1710 nm, peak at 1400 nm; 1° angle of view; high-pass filter >33 Hz
• S702PF – IR/flicker-sensitive, pipe fit (1/2 in. NPTM) with 10 ft pigtail, aluminum housing
• S706 – UV-sensitive, connector type, aluminum housing; UVTron sensor, spectral response 185–260 nm, peak at 210 nm; 5° angle of view
• S706PF – UV-sensitive, pipe fit (1/2 in. NPTM) with 10 ft pigtail, aluminum housing
• S706PF-050 – UV-sensitive, pipe fit with 50 ft (15 m) pigtail, aluminum housing
• S802 – IR/flicker-sensitive, connector type, stainless steel housing; twist-lock mounting block
• S806 – UV-sensitive, connector type, stainless steel housing; twist-lock mounting block

Honeywell Model 700SP Series Accessories

Cable & Connector Assemblies

• ASY782 – 15 ft pre-assembled C330S cable with pre-wired ASY786 connector; IP67 rated, CIC/ITC approved
• ASY785 – 50 ft pre-assembled C330S cable with pre-wired ASY786 connector; IP67 rated, CIC/ITC approved
• ASY785-200 – 200 ft pre-assembled C330S cable with pre-wired ASY786 connector; IP67 rated, CIC/ITC approved
• ASY786 – Field-wireable replacement connector with LED indicators; IP67 rated
• C330S – 4-conductor 22 AWG cable with drain wire and foil/braided shield; ITC/CIC rated; sold per foot

Mounting Hardware

• 700DA – Delrin replacement mounting block for S70X viewing heads; 1/2 in. NPTF process connection, 1/4 in. NPTF purge air; rated to 180°F (82°C) continuous
• 700DA-1 – Delrin replacement mounting block for S70X; 1 in. NPTF process connection; rated to 180°F (82°C) continuous
• 800DA – Delrin replacement mounting block for S80X viewing heads; 1/2 in. NPTF process connection; rated to 180°F (82°C) continuous
• 700UA – Ultem insulating mounting block for S70X; 1/2 in. NPTF, 1/4 in. NPTF purge air; rated to 320°F (160°C) continuous
• 800UA – Ultem insulating mounting block for S80X; rated to 320°F (160°C) continuous
• 700-1, 700-2, 700-3 – Small swivel mounts with 1/2 in. NPTM viewing head connection; varying process connections (1 in. NPTF, 1/2 in. NPTF, 1/2 in. flanged)
• M-701-1, M-701-2, M-701-2-FLG, M-701-2-SS, M-701-3, M-701-3P, M-701-4 – Large swivel mounts with 1 in. NPTF viewing head connection; various process connections including flanged, NPTF, and stainless steel configurations

Isolation & Thermal Protection

• R-518-13 – 1/2 in. NPTM Ultem heat and electrical insulating nipple for viewing head electrical isolation
• R-518-PT13 – Ultem insulating locking coupler adapter, 1/2 in. NPTM; for use with R-518-CL13-HTG locking coupler
• R-518-PT13L – Ultem insulating locking coupler adapter with quartz lens; for use with R-518-CL12-HTG locking coupler
• R-518-CL13-HTG – Locking coupler for use with R-518-PT13 adapter; 1/2 in. NPTF process connection
• R-518-CL12-HTG – Locking coupler for use with R-518-PT13L adapter; 1 in. NPTF process connection
• ISO-UNIT – Black anodized aluminum isolation unit; 1 in. NPTF connections, 1/2 in. NPTF purge port, quartz window
• ISO-UNITSS – Stainless steel isolation unit; same connections as ISO-UNIT
• ISO-UNITHPGT – High-pressure isolation unit with 1/2 in. thick quartz window; 1 in. NPTF connections
• 700ACC – Air cooling canister with side air inlet port; for use with vortex coolers
• M3208, M3210 – Vortex coolers for use with 700ACC air cooling canister; contact factory for selection assistance

Signal Conditioning & Other Accessories

• M-702-6 – Orifice disk kit; contains disks with 3/8, 1/4, 3/16, and 1/8 in. diameter holes and retaining rings; used to reduce flame signal brightness in high-intensity applications
• 800CR – Liquid-tight cable restraint for S80X viewing heads; includes 700CRLT and 800ACC-RING adapter
• 700CRLT – Liquid-tight cable restraint for S70X viewing heads
• COMMOD – USB to RS-422/RS-485 protocol converter for Modbus communication between signal processors and a PC or host control
• S700FOAD / S800FOAD – Fiber optic extension adapters for S70X and S80X viewing heads; allows placement of viewing head away from high-heat sources. Contact factory for selection assistance.

Documentation