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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.
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Specification: | |||||||||
Humidity Sensor: | |||||||||
Sensor Position
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The sensor is mounted on an
end plate at the top of the logger |
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Sensor Type |
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Accuracy | ± 3.5%RH from 10% to 90% ± 5%RH from 0% to 10% and 90% to 100% |
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Resolution | 0.1%RH | ||||||||
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). |
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Dew Point: | |||||||||
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 | ||||||||
Resolution | 0.1º C | ||||||||
Temperature: | |||||||||
Sensor Type | Thermister | ||||||||
Linear accuracy over range | ± 0.3º C (0º C to 70º C) | ||||||||
Repeatability | ± 0.1º C | ||||||||
Long term stability | ± 0.1º C | ||||||||
Logger: | |||||||||
Working Temperature | -20º C to +70º C | ||||||||
Storage Temperature | -30º C to +70º C | ||||||||
Sampling Rate |
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Storage capacity |
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Alarms |
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Start modes |
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Stop modes |
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Logging Modes |
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Battery |
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Download Time | 9min 30sec for Full Logger | ||||||||
Case material | ABS Plastic | ||||||||
IP Rating | 40 | ||||||||
Weight | 185g | ||||||||
Size | 130mm x 80mm x 30mm | ||||||||
Communication Connecter Pinout |
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1 Common A DLC8 download cable is required to connect the HT-LCD to a computer |
Liquid
Crystal Display Operation |
· Running
· Stopped
· 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.
· Alarm
1
· Alarm
2
If
both Alarms are triggered Alarm
will be displayed
continuously and 1
and 2
will flash consecutively.
replacement
HT-LCD Menu Options
Pressing
the Enter
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
· Channel
3
· 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).