The EnergyTools.com Runtime DataWatcher datalogger records the runtime of fuel-fired
heating systems, including hard-to-measure water heaters and millivolt heating systems.
The logger uses a unique method to monitor these heating systems: a temperature
sensor is installed in the flue of the system, and changes in the flue temperature are
used to determine when the heater turns on and off. A separate sensor is available
that allows the unit to also log motors, air conditioners and other electrical appliances
that radiate a changing (AC) magnetic field.
For each hour, the DataWatcher records the percentage of the hour that the monitored
device was on. Also recorded is information about the length of each on-cycle that
occurred. The DataWatcher can store up to 22 months of hourly runtime readings.
The WatchLink download and analysis software is used to retrieve data from the
DataWatcher and perform a variety of analyses that help interpret the data.
The flue temperature sensor does not work with condensing, 90%+ efficient, systems.
These systems can often be monitored through use of the motor/appliance sensor by
sensing the magnetic field of the gas valve.
- Determine Savings from Energy Efficiency Improvements: Nothing
beats real data when it comes to determining whether energy efficiency improvements are
really working. The DataWatcher's large memory capacity (22 months of readings) and
ability to monitor a wide variety of energy consuming devices make it an ideal tool for
doing before/after energy-use studies.
- Diagnose Heating System and Air Conditioner Problems: As well as
recording how much a heating/AC system runs, the DataWatcher also records information
about the length of the on-cycles of the system. Short-cycling problems can be
quickly identified by viewing the Cycle Length Graph.
Hydronic heating zones that are undersized can be identified by using the Motor/Appliance
sensor to monitor certain types of zone valves (a future sensor will allow the DataWatcher
to monitor all 24 VAC zone valves and other 24 VAC devices such as gas valves).
- Determine Proper Heating/Air-Conditioning System Sizing: The data
from the DataWatcher is very useful for determining the correct size for a heating or air
conditioning system. The Part-Load Profile Graph
makes it easy to identify how heavily loaded the heating/AC system was during the
coldest/warmest part of the monitoring period. From this information, an estimate of
loading under worst-case conditions can be made.
- Determine Hourly Usage Patterns for Motors, Appliances, and Heating Systems:
Building control systems can be improperly set or malfunction such that equipment
operates during periods when it shouldn't. The Hourly
Profile Graph shows how much the monitored device ran, on average, during each hour of
the day. The graph can also be focused on particular days of the week, such as
weekdays or weekends. This view of the data makes it easy to determine if scheduling
controls are operating correctly.
- Easy-to-Use Windows Software provides 4 Separate Data Analyses. (see
a Screen Shot from the software). The WatchLink
program uses a modern Windows interface to provide easy access to all the program
functions. An online help file provides context-sensitive help for each task.
The program performs 4 different analyses, and multiple customizations within each type of
analysis. 3 of the analysis functions were discussed in the Key Uses section above.
The remaining analysis is the Runtime Graph, which
simply graphs each collected runtime data point against time. Graphs and the
underlying data can be pasted into other Windows applications, such as spreadsheets and
word processors. WatchLink requires Windows 95, 98, or NT.
- 22 months of Data Storage make Long-Term Monitoring Possible. By
storing a reading once per hour, instead of every time the monitored device turns on or
off, the Runtime DataWatcher is able to store 22 months of readings. For
energy-efficiency studies that are affected by weather, a long monitoring period is often
- Only Datalogger Available that Monitors Heating System Runtime via Flue
Temperatures: This unique sensing method makes it easy to monitor systems
that do not have 24 VAC gas valves or electrical burners, such as domestic hot water
heaters and systems with millivolt gas valves. The Runtime DataWatcher's algorithm
for recognizing cycles by monitoring flue gas temperature is sophisticated and robust.
The DataWatcher learns the characteristics of the particular system it is
monitoring so that accuracy is enhanced.
- Uses Conventional AA Alkaline Batteries, which provide a 2-year battery life.
Three AA Alkaline batteries are used in the DataWatcher. Those batteries will
last at least 2 years before needing replacement. No hard-to-find and expensive
Lithium batteries are required!
- Motor/Appliance Sensor has Adjustable Sensitivity. The
Motor/Appliance sensor monitors motors and electrical devices that radiate a changing
magnetic field. Three different sensitivity levels are provided to maximize
versatility. On the High sensitivity setting, the sensor can be taped to the power
cord of a high-wattage appliance, such as an electric clothes iron or electric water
heater, and the sensor has enough sensitivity to detect when the device is on. When
set to lower sensitivity levels, interference from nearby electrical devices can be
minimized while still sensing the desired device. For example, the sensitivity can
be set low enough to measure a gas valve while ignoring the magnetic field from a nearby
- 24 VAC Direct Connect Sensor for wiring directly to 24 VAC devices.
You can directly connect the leads from this sensor to any device powered by
24 VAC, such as zone valves, gas valves, etc. The runtime of the 24
VAC device is then measured by the Runtime DataWatcher. This sensing
method eliminates potential interference sources that may in some situations
affect the Motor/Appliance Sensor described above.
- Clamp-on AC Current Sensor. This sensor clamps on a wire
powering an AC device and allows measurement of the device's runtime.
Perfect for monitoring appliances that produce small magnetic fields, not
detectable or accessible to the Motor/Appliance sensor. The sensor is
designed to detect currents as low as 0.1 Amp.
|Runtime DataWatcher (need to order
|Flue Sensor for Runtime DataWatcher. Used to
monitor combustion heating systems.
|Motor/Appliance Sensor for Runtime
DataWatcher. Used to monitor motors and appliances.
|Direct Connect Sensor for Runtime
DataWatcher. Used to directly wire to and monitor 24 VAC devices.
|Clamp-on AC Current Sensor for Runtime
DataWatcher. Used to monitor AC devices by clamping onto a
current-carrying wire powering the device.
|WatchLink Software for Runtime DataWatcher and
serial Download Cable used to download logger. Requires Windows 95, 98,
The Runtime DataWatcher and accessories carry a 14-day, money-back guarantee. If
you are not satisfied with the product for any reason, simply return the product within 14
days after you receive it, and we will refund the purchase price.
Go to our Orders Page to find out how to order a Runtime
The Runtime DataWatcher and accessories carry a 1 year parts and labor warranty.
Misuse and mishandling are not covered. Return the defective unit to EnergyTools.com
for repair or replacement.
Click here for Technical Specifications.