The HT-LCD is a handheld humidity datalogger with an integral humidity sensor and liquid crystal display. Both Relative Humidity and Dew Point can be displayed and logged. The HT-LCD uses a Sensirion SHT11 digital humidity sensor giving ± 3.5%RH accuracy from 10%RH to 90%RH. This logger is designed for indoor use (IP 40).
For outdoor applications, we recommend a THT-LCD with a TruTrack Seahorse Logger Enclosure. The THT-LCD logger is identical to the HT-LCD logger, except that it has an external Humidity/Temperature probe.
|The sensor is mounted on an
end plate at the top of the logger
|Accuracy||± 3.5%RH from 10% to 90%
± 5%RH from 0% to 10% and 90% to 100%
|Filter||The sensor is covered in a
Sensirion SF1 Filter cap. The filter cap provides protection against water, dust and other
contaminants for the humidity and temperature sensor. The filter cap consists of a
single piece of polypropylene including a filter membrane. The filter provides
filtration efficiency of 99.99% of all 0.1µ m particles and has an optimized response time
of typically 30s (1/e (63%) slowly moving air).
|Sensor Type||The Dew Point is calculated from the current Relative Humidity and Temperature|
|Accuracy||± 2º C (this is determined by the ± 3.5%RH accuracy of the humidity sensor|
|Linear accuracy over range||± 0.3º C (0º C to 70º C)|
|Repeatability||± 0.1º C|
|Long term stability||± 0.1º C|
|Working Temperature||-20º C to +70º C|
|Storage Temperature||-30º C to +70º C|
|Download Time||9min 30sec for Full Logger|
|Case material||ABS Plastic|
|Size||130mm x 80mm x 30mm|
HT-LCD has a 8 pin Mini-DIN female socket.
A DLC8 download cable is required to connect the HT-LCD to a computer
The HT-LCD displays logger status and alarm status continuously and can be set to show the humidity, dew point, temperature, or battery voltage and the number of logged samples.
Logger status is shown as:
· Waiting (Waiting for Start on Condition)
· Waiting Trigger (Waiting for Start on Trigger)
If the logger is waiting for Start on Trigger it can be started in the field from the Menu provided on the display.
If an Alarm has been triggered the display will show
· Alarm 1
· Alarm 2
both Alarms are triggered Alarm
will be displayed
continuously and 1 and 2 will flash consecutively.
will be displayed if the internal batteries requires
HT-LCD Menu Options
button on the front panel of the HT-LCD
activates the Menu Display. The Down Arrow can then be used to scroll down through the various Menu Options. When the required menu option is displayed, press Enter to select this option. Menu Options on the HT-LCD are:
· Channel 1 (Display Relative Humidity)
· Channel 2 (Display Dew Point)
· Channel 3 (Display Temperature)
· Channel 5 (Display Battery Voltage)
· Samples (Display number of samples logged)
· Trigger (IF logger is waiting for Start on Trigger)
· Alarm 1 (Reset/Trigger) Trigger is used to test
· Alarm 2 (Reset/Trigger) the Alarms
· º C / º F toggle
The display will update at 1 second intervals for 1 minute after any button is pushed. It will then slow down to 10 second display updates (this is a power saving feature).