CAISSON LVT 15 User manual

LVT 15
THERMO-HYDROMETER
INTRODUCTION
The compact thermo-hygrometer LVT-15 is used for
the measurement of the air temperature and the
relative air humidity (RH). ased on these
measurements the measuring instrument computes
the value of the dew point. Further the instrument is
equipped with a 3.5mm Jack for the additional
temperature measurement (STP-10A). The kit
contains:
•The Instrument LVT-15
•The inserted atteries
•The Case
•The Manual
Attention: The instrument is supplied including the
case.
Attention: Surface temperature sensors ar not
included, those are sold separately (Art.: STP-10A).
TECHNICAL DETAILS
•Power su ly: atteries, 2 x AA 1,5 Volt
•Current consum tion: 34mA
•Dimensions: 146mmx79mmx26mm (H× ×T)
•Weight: 200 g
•Dis lay: monochromatic with backlight, Resolution 128x64 Pixel
•O erating conditions: 5oC ~ 40oC <80% of rel. humidity without condensation
CAISSON Elektronik GmbH
Boschstrasse 16, D-47533 Kleve, Deutschland
tel: [phone] [email protected] www.caisson-gmbh.de

Measurement range
Function Range Accuracy Sensortype
Airtemperature -10 ~ +50°C ±0,3°C Thermistor
Air humidity 5 ~ 95% of relative Air Humidity ±2 % capacitive Sensor
Dewpoint -30 ~ +100°C -
Calculates from rel.
Humidity and air
Temperature the
Dewpoint
Surface Temperature as extra
item (STP-10A) -25 ~ +250°C ±0,5°C Thermistor
!!! Only IR version !!!
Embended Surface
Temperature -40 ~ +125°C ±1,0°C Thermistor
Manual LVT-15
In the illustration down the most im ortant elements of the equi ment are marked.
●The measuring instrument is switched on by
the pressing of the function button.
●Immediately after the start, the measuring
instrument shifts into the measuring mode,
all measured values are shown:
•Air Temperature
•Relative Humidity
•Dewpoint
•Surface Temperature
CAISSON Elektronik GmbH
Boschstrasse 16, D-47533 Kleve, Deutschland
tel: [phone] [email protected] www.caisson-gmbh.de

Attention: If bars „---”, like these are indicated that can mean that: the thermistor was not
connected, or the thermistor is damaged, or the temperature range was exceeded. If the value of the
air humidity is indicated with bars „---”, it means that the measuring range was exceeded.
●Pressing the function key will cause sequential switching between the individual measured
values. The value of the measured parameter is shown enlarged on the screen, in this way one
can emphasize the variable of interest. In this operating mode on the bottom of the screen in
„the information ledge” other parameters are sequentially shown. Further pressing of the
function key different values are highlighted in the way already previously explained.
Information
ledge
●Sixfold fast pressing of the function key causes the menu of the instrument is activated. Here
the settings of the language, temperature unit, automatic switching off and the information
ledge can be changed. Following Options can be selected:
●Languag [English, Deutsch]
●Temperature Units [°C, °F]
●Automatic switching off [ Off, 3Min., 5Min., 10Min.] – the downtime determines, after
which time the measuring instrument is switched off automatically. As downtime the time
is considered, in which the function key is not pressed. If the automatic switch off function
is adjusted to „off”, the equipment can be switched off only manually.
●The information ledge [1sec, 2sec, 4sec] – determines die refreshing rate of the values in
the information ledge.
CAISSON Elektronik GmbH
Boschstrasse 16, D-47533 Kleve, Deutschland
tel: [phone] [email protected] www.caisson-gmbh.de

In order to make changes, the desired option is to be selected by click. Press the key for
approximately 2 seconds, until the selected option begins to flash and becomes active. y clicking
you change the selection of the active option. Repeated pressing of the key for 2 seconds till
flashing of the active function stops. In order to get out of the setup menu and back into the
measuring mode, you select SAVE & EXIT, then you keep the key pressed for 2 seconds. The
following pictures show the discribed procedure.
Press the function button
Press the functions button 6 times
Press and hold the fuction button for 2 seconds
CAISSON Elektronik GmbH
Boschstrasse 16, D-47533 Kleve, Deutschland
tel: [phone] [email protected] www.caisson-gmbh.de

Switching-off the instrument
●In order to switch the equipment off, you press and hold the function key for approx. 6
seconds. However switching of the equipment off is not possible from the setup menu in
this way.
●The measuring instrument can switch off automatically, if the function for automatic
switching off is active (see section menu of the measuring instrument).
●If the battery conditions are so low that in fact it could come to errors during the
measurement the equipment will automatically switch off, which is signaled earlier with the
message „battery empty”.
Practical ti s for the user
The air flow through the cover of the sensor
●The air humidity and air temperature sensor are behind a plastic cover. It is very important that
this cover is not covered. This ensures free air circulation and associated precise measurements.
●The air humidity and air temperature sensor need time, in order to adapt to the new measuring
conditions. efore switching on the measuring instrument in a new environment, one should
wait 2 minutes. This time can be shortened by gentle moving of the measuring instrument,
which will force the air flow in the sensorcover.
●One of the most important tasks of the measuring instrument is it to measure the dew point. If
the temperature of the assistance of a thermal element checked surface is lower or very similar
to the dew point temperature, it can come to the process of condensation of water on the
surface. This danger is signaled by an acoustic signal and by flashing the dew point value.
CAISSON Elektronik GmbH
Boschstrasse 16, D-47533 Kleve, Deutschland
tel: [phone] [email protected] www.caisson-gmbh.de

Power su ly
The LVT15 r is powered by two AA batteries. You may use either disposable or rechargeable
batteries. The attery status indicates the battery charge level. If an empty battery icon is
displayed, replace the batteries. atteries should be replaced with a new set of batteries of the same
kind. Do not use a rechargeable battery in combination with a disposable battery or a partially
discharged battery with a full battery.
The figure below shows the location of the batteries in the battery compartment.
Warranty
Notwithstanding the statutory warranty claims, CAISSON provides a warranty in accordance with
the laws of the Customer's country for a period of at least two years from the date of sale of the
device to the end user. The warranty covers only those faults which are caused by defects in
material or workmanship. A warranty claim must be accompanied by a proof of purchase with the
date of sale specified. Warranty repairs shall be performed only by an authorized distributor of
CAISSON. The following are excluded from the warranty:
●Misuse
●Use of force, damage caused by external factors or foreign bodies such as sand or water
●Damage caused by failure to comply with the instructions for use
●Normal wear and tear
The warranty also excludes devices that are partially or entirely disassembled.
CAISSON Elektronik GmbH
Boschstrasse 16, D-47533 Kleve, Deutschland
tel: [phone] [email protected] www.caisson-gmbh.de