Our customers are mostly interested in RH readings and often “in situ” (which means within specially created cavities in building materials, or air flows of drying equipment), so we have developed a range of custom sensors specifically for those applications, and this includes the award winning HygroBug.
Regardless of the application area Relative Humidity (RH) and temperature almost always go hand in hand as RH without temperature is almost meaningless. For a given amount of moisture in a set amount of air, the RH value will reduce as temperature increases, because hot air is capable of carrying a larger amount of water. This movement of RH with temperature is one of the many important reasons why it is important to record and display graphically the RH and temperature over time with monitoring systems, and not just take sporadic isolated data points on their own
Specific Humidity and Mixing Ratio are derived values from RH and temperature that are calculated on line, in real time on the CDLSmarthub so it can also be displayed graphically per sensor location along with all the other parameters, and have high and low alarms thresholds set for alarm notifications.
Caption Data will be supplying a number of battery powered wireless sensors, that will be installed throughout the structure of the hammer beam roof.
The magnificent hammer-beam roof of Westminster Hall is the largest medieval timber roof in Northern Europe. Measuring 21m by 73m (68ft by 240ft) and some 30m tall, the roof was commissioned in 1393 by Richard II, and is still standing.Read More
Caption Data were recently commissioned to install an environmental monitoring system at a notoriously haunted castle in Cornwall.
Pengersick Castle is undergoing a significant renovation program to return the Grade One listed building back to its former, impressive state.Read More
Some of the problems of monitoring the drying of concrete are:
“Thank God for Hygronet!” says Borge Enga one of Polygon AS [Norway] Project Managers.
Borge explained further details in a recent conference call with CDL, the makers of HygroNet™. The story began with an instruction for Polygon to deal with water damage in a rather unusual property – a house of some 180m2. The house not only had many rooms with many different construction techniques, but it had valuable wooden ceiling panels that were to be protected at all costs!
As the use of forced air drying systems is becoming more widespread there is a need to be able to monitor the progress of drying, real time.
Depending on the method used quite often there is a need to measure within pipe/ductwork and generally it is impractical to place a whole sensor into the air flow. This can be down to the fact it is physically not practical or the temperature within the pipe work is simply too high.
The RDL//1000 easily connects up to 256 sensors with a 500m line of sight range, and is ideally designed for applications in structural and environmental monitoring
HygroNet remote data logging systems are designed to support the water damage restoration industry by measuring key data throughout the drying cycle
Works by measuring the change in electrical capacitance of a polymeric “sandwich material”
This type of digital sensor is very widely used in a myriad of devices in automotive, industrial & consumer electronics applications, with literally billions of sensors produced.
We use the industry leading Swiss company Sensirion’s SHT21 [link to data sheet] which offers a small footprint of 3mm, viable RH & T accuracy across a useful range& is pre calibrated.
Limitations can be experienced around prolonged exposure at very high RH levels when upward drifting of results is experienced. Also the “drying out” process following such exposure can be cumbersome.
An Alternative to the Capacitative sensor type is the Resistive sensor.
GE developed their market leading HygroStick product for measuring humidities in building materials using this technology, and have licenced Caption Data to integrate these sensors into their Remote Monitoring Systems, particularly useful for Construction, Damage Restoration, Flooring, and other industries where prolonged exposure to high humidities happens.
*The Sensors division of GE was sold to Amphenol in 2013
These sensors can be used immediately and seamlessly with the RDL//1000 system from CDL, offering the following advantages:
High stability at high RH values over extended time periods – no appreciable drift over time
High accuracy +/- 1.75% RH [cf +/- >4-5% for Capacitative type at high RH]
Built in Unique ID calibration data, retrieved and used by the CDL system
Wood Moisture & WME
The varying electrical resistance of wood depending on its moisture content has been known for over a century, and forms the basis of the Hygrobug. Rather than inserting probes into the wet building material a hole is drilled and a Hygrobug inserted. This standardised wooden dowel equalises to the humidity of the ost material and the electrical resistance is measured via any Hygronet or RDL//1000 wireless sensor. The advantages compared to a capacitative type sensor are the speed of response and resolution of measurements to quickly detect the impact of drying regimes within the host material. The Hygrobug overcomes the various problems of using electrical probes for long term monitoring
All CDL systems have a standard 3.5mm jack plug socket and will accept data form proprietary electrical resistance probes. Our hardware and firmware offers resolution down to 13% WME values
All CDL sensors are supplied with our own or the sensor manufacturers standard calibration.
The RDL//1000 and Hygrostick systems offer a unique calibration management system, with visibility down to individual sensor level within a monitoring system
Actually it’s not software! It’s SaaS, Software as a Service. We host all the software on our super secure servers (see more on security), and provide you with real time access to data in graphical format via the CDLSmartHub, which is completely web based and means there is no need to install software – making the CDLSmartHub accessible from any device, anywhere, at anytime.