April 2017Analytical Instrumentation & Environmental Monitoring
Fluke and HART Scientific have revolutionised environmental monitoring for calibration laboratories with the model 1620A DewK, which offers Ethernet and wireless connections and upgraded LogWare III software.
Two types of sensors are available. The high-accuracy sensor (H model) reads temperature to 0,125°C over a calibrated range of 16 to 24°C. Relative humidity readings are to 1,5% RH from 20 to 70% RH. The standard-accuracy sensor (S model) reads temperature to 0,25°C over its calibrated range of 15 to 35°C. Relative humidity readings are to 2% RH from 20 to 70% RH. All DewK sensors come with NVLAP accredited certificates of calibration for both temperature and humidity, complete with data and NIST traceability.
Ethernet and wireless capability
The DewK features built-in Ethernet RJ45 jack and multiple DewKs can be monitored from the same screen using the new LogWare III client-server software. Ethernet also allows for the possibility for remote connectivity over the Internet, so that critical conditions can be monitored from a remote location and data can be sent to a printer through the RS-232 interface in real time.
Mathematical and statistical functions
In addition to temperature and humidity, the DewK calculates dew point, heat index, and rates of change for both temperature and humidity. Min, max, and a variety of other statistics are also calculated and can be shown on-screen. Daily summary statistics, including min, max, and maximum rates of change are stored for the most recent sixty days.
There are inputs for two sensors, each measuring both temperature and relative humidity, so that the instrument can monitor two locations simultaneously. Both sensors can be run via extension cables to remote locations up to 100 feet away, or one sensor can be directly mounted to the top.
Each sensor is calibrated for both temperature and humidity at Fluke Calibration. The calibration constants assigned to the sensors reside in a memory chip located inside the sensor housing, so sensors may be used interchangeably. Sensors may also be assigned a unique identifier (up to 16 characters) to facilitate record keeping by matching the sensor identifier with the collected data.
The impressive memory capacity is enough to store up to 400 000 date and time-stamped data points i.e. two years’ worth of data for both measurements from two sensors from readings taken at ten minute intervals.
Alarms, battery backup and display
Alarm settings are easily made based on temperature, the rate of change in temperature, RH, the rate of change in RH, and instrument fault conditions. Alarms can be both visual (flashing display) and audible (beeping). Likewise, alarm settings can be set up and events triggered in LogWare III. The DewK is also equipped with a 0 to 12 V alarm output that can trigger a process control system. A backup battery shuts down the display but maintains measurements for up to 16 hours in the event of a power failure. Finally, the device can be configured to display in up to 16 different setups that can be stored, recalled and easily modified.
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