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    Sensaphone Model 800 Desktop Monitoring System — User's Manual

    September 08, 2026 5 min read

    User's Manual for the Sensaphone Model 800 Desktop Monitoring System — fully-programmable environmental monitoring with telephone dial-out alerting.

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    Full text manual (for reference)

    User's Manual for the Sensaphone® Model 800 Desktop Monitoring System — a fully-programmable environmental monitoring system with phone dial-out alerting, for small businesses, homes, farms, greenhouses, computer rooms, and remote facilities.

    Overview

    The Model 800 is designed for desktop or wall mounting and requires no changes to standard electrical or telephone service. When connected to a telephone line, it responds to an alarm by dialing up to four separate telephone numbers, delivering a user-recordable voice "Alert Condition" message when the call is answered.

    Built-in Monitoring

    • High sound level
    • AC electric power failure
    • Battery backup status
    • Temperature (factory-installed thermistor on Zone 1)

    The unit has 8 alert zones total. Additional sensors (available separately from Sensaphone) can extend monitoring to intrusion/unauthorized entry, water leaks, temperature, humidity, equipment operation, and more.

    Feature Summary

    • Eight zones, configurable as temperature or dry contact — each individually enabled/disabled
    • Fully automatic input configuration; per-zone calibration
    • Power monitor and high sound-level monitor
    • User-recordable voice messages
    • Dial-out to up to 8 telephone numbers, including voice and numeric pager support
    • Built-in microphone for onsite listen-in
    • Built-in line seizure; relay output (manual or automatic control)
    • Four status LEDs; surge protection on all zones, telephone line, and power supply
    • 24-hour battery backup (six C-cell alkaline batteries, not included)
    • Wall or desktop installation

    Layout & LED Indicators

    Front panel includes: Programming Keypad, Power Jack, Phone Extension Jack, Phone Line Jack, Speaker, Built-in Microphone, System On LED, Phone-in-Use LED, Alarm LED, Battery OK LED, Battery Compartment, and an Input/Output Wiring Door.

    LED Off Blinking On
    System On Unit is off Standby mode Run mode
    Phone-In-Use Phone line not in use No telephone service detected Unit/device communicating on phone line
    Alarm No alarms exist Unacknowledged alarm exists Acknowledged alarm exists
    Battery OK No battery / critically low Battery condition low Battery condition good

    Installation Basics

    • Operating Environment: Clean, dry area near an AC power source and telephone line. Operating temperature 32°F to 122°F (0°C to 50°C). Avoid strong electrostatic, electromagnetic, or radioactive fields, and humid/corrosive environments.
    • Mounting: Flat-mount on a desk/horizontal surface, or wall-mount using the keyhole slots on the back panel (flathead screws 4" apart).
    • Power Surge Protection: Built-in surge protection is included, but additional protection (e.g. the ISOTEL Model IB-4 Surge Protector, available through Sensaphone) is recommended, especially in lightning-prone areas.
    • Battery Backup: Six size-C alkaline batteries (not included) provide up to 24 hours of backup during an AC power failure.

    Weekly Testing Procedure

    Sensaphone recommends weekly testing to ensure the unit will function properly when needed:

    1. Call the unit and listen to the Status Report — verifies phone answering, zone readings, alarm conditions, power status, microphone, and battery condition.
    2. Trip each connected sensor to create an alarm on every zone (heat/cool a temperature sensor, walk in front of a motion sensor, open a door/window sensor, apply water to a water sensor, raise humidity for a humidity sensor) and allow the unit to dial all programmed numbers.
    3. Test batteries: unplug the AC adapter and confirm the unit continues to run. Press WHAT IS, then STATUS, and confirm the report states "the power is off" and "batteries are OK." Allow the unit to dial out on battery backup, then restore AC power.
    4. If using the unit to listen for a smoke alarm, test the smoke alarm and confirm the Sensaphone triggers a high-sound-level alarm and dials out.
    5. Keep a log of test dates and pass/fail results for each category (see the Test Log at the end of the manual).

    Troubleshooting

    Problem Likely Cause Solution
    Unit says "Error 1" Invalid value entered, or timed out entering a value Enter values within the allowed range in a timely fashion
    Unit says "Error 2" Programming attempted without unlocking the keypad Unlock the keypad, then make changes
    Model 800 fails to dial out Wrong number programmed; tone/pulse mismatch; recognition time too long; incompatible (digital) phone line Recheck programmed number; switch tone/pulse setting; shorten recognition time; connect to a standard 2-wire analog line
    Won't answer for Status Report or acknowledgment Rings Until Answer misconfigured, or line limits ring count (e.g. max 4 rings) Recheck Rings Until Answer setting; try fewer than 4 rings; try a standard residential line
    Won't answer for Callback Acknowledgment Didn't let phone ring long enough (10 rings if TAD disabled) Let it ring 10 times if TAD is disabled; if TAD enabled, call, let it ring once, hang up, wait 10 seconds, call back within 30 seconds
    Recites messages by phone but silent on-site Local Voice Mute is active Deactivate Local Voice Mute
    Temperature reads -20°F/-30°C Sensor disconnected or wire broken Examine and reconnect/replace wiring
    Temperature reads 150°F/65°C Sensor wires shorted Verify and correct wiring
    False high-temperature alarms from a freezer Normal defrost cycle raises temperature temporarily Set a zone recognition time longer than the defrost cycle
    Frequent false high-sound alarms Sound sensitivity too high, or recognition time too short Reprogram sound sensitivity and/or lengthen recognition time
    False power-out alarms Power failure recognition time too short (brief AC interruptions) Increase power failure recognition time
    Doesn't recognize any alarm Zones disabled, or recognition time too long Enable zones; shorten recognition time as needed
    Batteries drain prematurely AC transformer unplugged, forcing battery-only operation Keep AC transformer plugged in; remove batteries when storing the unit

    If issues persist after trying the above: remove the batteries, unplug the unit, wait one minute, plug the AC adapter back in, then replace the batteries.

    Specifications

    Spec Value
    Alert Zones 8 (thermistor installed on Zone 1); N.O./N.C. contact or 2.8K thermistor (-20°F to 150°F / -30°C to 65°C)
    Zone Protection 5.5VDC Metal Oxide Varistor with fast-acting diode clamps
    Microphone Internal electret condenser for listen-in and high sound-level detection
    Phone Interface RJ11 line jack (2-wire analog); RJ11 extension jack w/ line seizure; MOV & self-resetting fuse protection
    Relay Output Rated 1A 30VAC / 1A 30VDC max
    Power Supply 120VAC/9VDC 60Hz 6W wall plug-in transformer with 6' cord; 1.5W consumption
    Battery Backup Six size-C alkaline batteries (not included), ~24 hours backup
    Operating Environment 32-122°F (0-50°C), 0-90% RH non-condensing
    Storage Temperature 32-140°F (0-60°C)
    Dimensions 2.1"h x 7.8"w x 8.8"d, 2 lbs.

    Returning the Unit for Repair

    Contact Sensaphone Technical Service (610-558-2700) before shipping. Unplug the AC power, remove batteries, disconnect all sensors, pack carefully, and include your name/address/phone and a note describing the problem. Ship prepaid and insured to: Service Department, Sensaphone, 901 Tryens Road, Aston, PA 19014.

    Manufacturer & Support

    Sensaphone, 901 Tryens Road, Aston, PA 19014 — Phone: 610-558-2700, Fax: 610-558-0222 — support@sensaphone.com — www.sensaphone.com. Technical Support available 8:00am-5:00pm EST.