A multipurpose, remote temperature, air flow, and humidity sensor for use with WeatherGoose climate monitors.
Remote Temperature, Air Flow & Humidity Sensor
Built to monitor internal computer cabinet or server room conditions, the RTAFH sensor contains a temperature, humidity and air flow sensor. Up to 16 RTAFH sensors can be attached to any of the WeatherGoose family of climate monitors.
Both varieties of the sensor are housed in a ventilated, 4-inch Delrin plastic tube. The nylon clamp permits sensor attachment to both metal and wood surfaces. Cable lengths of 20 and 100 feet are available.
Temperature and humidity are measured by industrial- grade digital sensors with excellent accuracy.
A Delrin plastic tube contains all the electronics - the sensor is powered by the WeatherGoose power. A nylon strap allows secure mounting. The sensor is supplied in 20' and 100' cable lengths, although the user can add or shorten the cable as required. Maximum cable length is 600' aggregate length.
Temperature Sensors
Range: -40 to 40C (-40F to 140F)
Sensor: Maxim 18B20 semiconductor
Accuracy: +/-0.5C
Humidity Sensor
RH Accuracy: +/- 2% RH
Sensor: Honeywell HIH-3610
Repeatability: +/- 0.5% RH
Response time: 15s in slowly moving air @ 25 degC
Range: 0 to 100% RH, non-condensing
Air Flow Sensor
Range: 0 - 100 relative air flow
Sensor: amount of heat change method (see below)
Repeatable accuracy: +/-20%
Scale: uncalibrated, zero air flow reads 20
Operating range: 65 to 110F (18 to 43C)
Air Flow Detection
Air flow is computed by comparing a periodically heated temperature sensor to a separate reference temperature. Faster air flow causes more rapid heat increase. The sensor's dynamic range approximates common computer cabinet internal air movement. The physical amount of air moving is not computed. Still air reads about 20 on the 0 to 100 scale. The sensor is immune to temperature change in cabinet and most room environments.
Installation
The air flow sensor's open end should face the air flow source for maximum sensitivity. Mounting the sensor perpendicular to air flow will reduce sensitivity and may cause air flow values to fluctuate due to turbulence. The sensor should be located in the hottest part of the cabinet or room. Rigid mounting is recommented to avoid movement in the air which can cause erratic readings.
The air flow sensor exhibits maximum sensitivity when the open end faces the airflow. This orientation minimizes internal turbulence within the protective plastic tube.
Telephone-type splitter blocks permit up to 16 RTAFH sensors to attach to the WeatherGoose series of climate monitors. Punch-down blocks can also be used to connect the Cat 3 wires.
Model Codes
RTAF- 20: Temp and Air Flow, 20' cable
RTAF-100: same as RTAF-20 but with 100' cable
RTAFH-20: Temp, Humidity, Air Flow, 20' cable
RTAFH-100: same as RTAFH-20 but with 100' cable