Sensors; Overview; Internal Sensors; Remote Sensors - Geist Watchdog 15 Series Instruction Manual

Sensors

Overview

All internal sensors are measured every 5 seconds. External sensors are measured every 10 to 30
seconds, depending on the number of devices connected. Sensor data collected by Watchdog 15
units provides useful trend analysis data. While all values are not absolute in relation to a known
unit, trend analysis of the data allows users to view changes and draw useful conclusions about
what is happening over time in the monitored environment.

Internal Sensors

Watchdog 15 units contain the following onboard sensors:
 Temperature: Measures temperature and can be displayed in °C or °F. The accuracy is ±0.5
°C from -20°C to 80°C. Note: This sensor may be heated by internal circuitry in the unit; a
temperature offset is available to re-calibrate.
 Humidity: Measures the percent of water vapor in the air within ±2% from 20% to 80%.
 Dew Point: Calculated measurement of temperature at which moisture in the air will turn to
water based on the humidity and temperature measurements.

Remote Sensors

Available Sensors
RT: Temperature

GTHD: Temperature / Humidity / Dew Point

GT3HD: Temperature / Humidity / Dew Point with ability to add two RT sensors

RTAFHD3: Temperature / Air Flow / Humidity / Dew Point

CCAT: Converts analog I/O Sensors to Remote Digital Sensors

RS2: Remote power monitoring and switching

RTAFHD3 Compatibility
The (G)RTAFHD3 sensor cannot be utilized in combination with the discontinued (G)RTAF and
(G)RTAFH sensors or (G)RTHD sensors built prior to 2010. If you desire to add (G)RTAFHD3
sensors to an existing installation currently utilizing incompatible sensors, please contact
Customer Service for installation options.
Connecting Remote Sensors
Plug-and-play remote sensors may be attached to the unit at any time via the RJ-12 connectors
on the face of the unit. In some cases splitters may be required to add additional sensors. Each
sensor has a unique serial number and is automatically discovered and added to the web page.
Up to four sensors may be connected to the Watchdog 15.
The display order of the sensors on the web page is determined by the serial number of each
sensor. Friendly names for each sensor can be customized on the Display page.
Note: The sensor uses Cat. 3 wire and RJ12 connectors. Wiring must be straight-through: reverse polarity
will temporarily disable all sensors until corrected.
Note: The sensors use a serial communication protocol and are subject to network signaling constraints
dependent on shielding, environmental noise, and length of wire. Typical installations allow runs of up to
600 feet of sensor wire.
GM1137 20 Revision Date: 02/13/2015