ROTRONIC HygroLog HL-NT - Manual (Page 10)

IN-E-HL-NT-V2_12
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroLog HL-NT data logger:
instruction manual Instruction Manual
Document Type
Page 10 of 48
Document title
© 2009-2012; Rotronic AG IN-E-HL-NT-V2_12
2.6 LED Indicators
The HygroLog HL-NT is equipped with a green and red LED. The logger can be configured with
HW4 to have the green side of the LED flash when logging is active. The red side of the LED can
be made to flash when there is an alarm condition (see note below) and / or when the logger
requires attention (low battery, flash memory card full, etc.)
In the transient alarm mode, the red LED flashes for only as long as the data from a probe
corresponds to an alarm condition. In the durable alarm mode, the red LED stays on even after
the alarm condition has disappeared. When the LED is set to provide a durable alarm, it can be
reset from the keypad or with HW4.
2.7 Beeper
The HygroLog HL-NT is equipped with an internal beeper and can be configured with HW4 to
make a clicking sound when any key is being pressed. The beeper can also be configured to emit
a 5-second non-repeating sound when there is an alarm condition and / or when the logger
requires attention.
2.8 HygroLog HL-NT functions
2.8.1 Calculated parameter
Using the HW4 software, the HygroLog HL-NT can be set to compute for each HygroClip probe
one of the following psychrometric parameters.
o Dew point (Dp)
o Frost point (Fp)
o Wet bulb temperature (Tw)
o Enthalpy (H)
o Vapor concentration (Dv)
o Specific humidity (Q)
o Mixing ratio by weight (R)
o Vapor concentration at saturation (Dvs)
o Vapor partial pressure (E)
o Vapor saturation pressure (Ew)
cover
memory
card
Memory Card:
To access the memory
card, remove the screw
shown to the right and pull
out the rubber cover.
The plug-in flash memory
card is located on top of
the main board.
screw