GANN RH-T 37 BL flex User manual

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RH-T 37 BL
Operating Instructions
Version 2.2
Active Electrode
RH-T 37 BL
RH-T 37 BL flex

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RH-T 37 BL
Table of Contents
0.1 Publication Statement........................................................4
0.2 General Notes ...................................................................5
0.3 WEEE Directive 2002/96/EC Law on Electrical and
Electronic Equipment.........................................................6
1Introduction.......................................................................... 7
1.1 Description.........................................................................7
1.2 Device Layout....................................................................8
1.3 Display Symbols................................................................9
2Basic Functions................................................................. 10
2.1 Display in Measuring Menu ............................................. 10
2.2 Setting Menu ................................................................... 11
2.2.1 Measuring Menu (Main Menu)............................ 11
2.2.2 Measuring Mode Selection Menu (Ring Menu) .. 12
2.2.3 Maximum Value Display..................................... 15
2.2.4 Minimum Value Display...................................... 16
2.2.5 Memory Menu .................................................... 17
3Specifications..................................................................... 18
3.1 Technical Data................................................................. 18
3.2 Prohibited Environmental Conditions............................... 19
3.3 Measuring Ranges .......................................................... 19
3.4 Storage conditions........................................................... 19

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RH-T 37 BL
4Application Notes .............................................................. 20
4.1 Measuring Air Humidity ................................................... 20
4.1.1 Absolute Humidity............................................... 20
4.1.2 Moisture Saturation ............................................ 20
4.1.3 Relative Air Humidity.......................................... 21
4.1.4 Equilibrium Moisture Content (EMC).................. 21
4.1.5 Water Activity (WA) ............................................ 21
4.1.6 Wet-bulb Temperature........................................ 21
4.1.7 Enthalpy ............................................................. 23
4.2 Measuring the Temperature ............................................ 24
4.2.1 Dew Point Temperature...................................... 25
4.2.2 Dew Point Dependent on the Air Temperature and
the Rel. Humidity for Condensation Calculation. 26
4.3 Handling the Hydromette................................................. 27
4.4 Sorption Isotherms .......................................................... 27
4.4.1 Building and Insulation Materials........................ 31
4.4.2 Wood.................................................................. 36
5Appendix ............................................................................ 38
5.1 Material Table.................................................................. 38
5.2 References...................................................................... 39
5.3 General Concluding Remarks.......................................... 39

Introduction
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RH-T 37 BL
0.1 Publication Statement
This publication replaces all previous versions. It may not be
reproduced in any form or processed, duplicated or disseminated
using electronic systems without the written permission of Gann
Mess- u. Regeltechnik GmbH. Subject to technical and
documentary changes. All rights reserved. This document was
prepared with the required care. Gann Mess- u. Regeltechnik
GmbH accepts no liability for errors or omissions.
GANN Mess- u. Regeltechnik GmbH, Gerlingen, Germany.
07/11/2014

Introduction
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RH-T 37 BL
0.2 General Notes
This measuring device fulfils the requirements of the applicable
European and national directives (2004/108/EC) and standards
(EN61010). Appropriate declarations and documentation are held
by the manufacturer. To ensure trouble-free operation of the
measuring device and operational reliability, the user must carefully
read the operating instructions. The measuring device may only be
operated under the climatic conditions specified. These conditions
can be found in Chapter 3.1 "Technical data". This measuring
device may likewise only be used under the conditions and for the
purposes it was designed for. Operational reliability and
functionality are no longer ensured if the device is modified or
adapted. Gann Mess- u. Regeltechnik GmbH is not liable for any
damage arising from such modifications or adaptations. The risk is
borne by the user alone.
Using appropriate means, make always sure that there
are no electrical cables, water pipes, or other utility lines at
the location, at which the measurement is to be carried
out.
The device must not be stored or operated in aggressive
air or air containing solvents!
Material that is frozen or has wet surfaces cannot be
measured.
The notes and tables in these instructions on permitted or
normal humidity conditions in practice and the general
definitions of terms have been taken from the specialist
literature. No responsibility can therefore be taken by the
manufacturer for the correctness of this information. The
conclusions to be drawn from the measurement results
are related to the individual conditions and the knowledge
drawn from professional experience for each user.

Introduction
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RH-T 37 BL
The measuring device may be operated in residential and
commercial areas, as the stricter class B for emitted
interference (EMC) has been adhered to.
The device may not be operated in the immediate area of
medical equipment (heart pacemakers, etc.).
The measuring device may only be properly used as
described in these instructions. Keep the device and
accessories out of the reach of children!
Measurements must not be carried out on metallic
surfaces.
Gann Mess- u. Regeltechnik GmbH accepts no liability for damage
resulting from non-adherence to the operating instructions or by not
taking proper care during transport, storage or operation of the
device, even if this requirement for care is not specifically
addressed in the operating instructions.
0.3 WEEE Directive 2002/96/EC Law on Electrical and
Electronic Equipment
Disposal of packaging, battery, and device must be undertaken in
accordance with the legal requirements at a recycling centre.
The device was manufactured after 1 Mai, 2010

Introduction
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RH-T 37 BL
1 Introduction
1.1 Description
The active electrode TH-T 37 BL is a precise thermo-hygrometer
for quick measurement of relative air humidity and air temperature.
Using programmed sorption-isotherms, the weight and mass
percentages can be determines for various building and insulation
materials, as well as hardwoods and softwoods.
The model flex has a flexible sensor tube (6.55mm diameter, swan
neck) and is therefore excellent for measurements of points that
are difficult to access.
The RH-T 37 BL is eminently suited to moisture analyses, damage
evaluation, dehumidifying buildings and checking the readiness of
floor and wall coatings.

Introduction
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RH-T 37 BL
1.2 Device Layout
Sensor
Hydromette BL UNI 10
Handle

Introduction
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RH-T 37 BL
1.3 Display Symbols
Main menu symbols
Air humidity in %
Measured value is held;
ready for measurement
Temperature in °C
Dew point (Dp) in °C
Other symbols
Min/Max display
Air humidity in %
Dead battery
Temperature in °C
Memory location 1

Basic Functions
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RH-T 37 BL
2 Basic Functions
2.1 Display in Measuring Mode
Measured value in %
"Hold" symbol signals readiness to
make a measurement
Measured temperature in °C
Calculated dew point (Dp)
in °C
A measurement is started by pressing the "M" button. During the
measurement process, the "%" symbol blinks and the values adapt
to the surrounding conditions. After releasing the "M" button, the
"%" symbol is displayed steadily and the "Hold" symbol also
appears.
The device is now in Ready mode.
Press the "M" button again to start a new measurement.
Approx. 40 seconds after releasing the measurement button, the
device switches itself off automatically to save battery power. If the
device is switched on again, the last value measured is shown on
the display.
Figure 2-1: measuring mode

Basic Functions
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RH-T 37 BL
2.2 Setting Menus
If the up or down buttons are pressed in Ready mode, the various
setting menus are shown in sequence:
1. Measurement menu (Ready mode): The measuring
process can be carried out here
2. Measuring mode selection: Here you can specify the
measuring mode (section 2.3.2)
3. Maximum value display: The largest value measured is
shown here (section 2.3.3)
4. Minimum value display: The smallest value measured is
shown here (section 2.3.4)
5. Saved menu: The last 5 values measured can be called
here (section 2.3.5)
2.2.1 Measurement Menu (Main Menu)
The last measurement with the note "Hold" is shown here.
In this menu, a new measurement can be started by pressing the
"M" button.
During the measuring process, the "Hold" symbol disappears from
the display. After releasing the "M" button, the measured value is
saved. The "Hold" symbol is displayed again.
If the new measured value is larger than the previous maximum
value, "Max" flashes on the display. If the value is not to be saved,
the "M" button must be pressed briefly. If the value is not to be
saved, a new measurement is started with a long press on the "M"
button without changing the previous maximum values.

Basic Functions
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RH-T 37 BL
2.2.2 Measuring Mode Selection Menu
In this menu, the various modes for the RH-T 37 BL can be set.
The currently active mode is selected with a short press of the M
button. The mode then begins to blink. Now a mode can be
selected with the Up and Down buttons and confirmed with a short
press on the M button.
The RH-T 37 BL has 2 different setting modes, which are run
through in the following increasing sequence:
Figure 2-2: measuring mode selection menu
Relative humidity
EMC
Absolute humidity
Enthalpy
Wet-bulb
thermometer
Water activity
Wood 32-33
Building material 11-25

Basic Functions
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RH-T 37 BL
The selected mode changes the display of the measurement menu.
Depending on the mode, the appropriate physical dimension is
displayed:
Measuring mode "rh" (relative humidity):
the relative humidity (in %), the temperature (in °C)
and the dew point (in °C) are displayed
Measuring mode „UGL“(Equilibrium moisture
content):
The relative humidity (in %), the temperature (in °C)
and the equilibrium moisture content (in %) are
displayed
Measuring mode "Ah" (absolute humidity):
the relative humidity (in %) and the absolute humidity
(in g/m³ i.e. grammes of water in 1m³ of air)
Measuring mode "En" (enthalpy):
the relative humidity (in %) and the enthalpy (in kJ/k)
are displayed.

Basic Functions
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RH-T 37 BL
Measuring mode "to" (wet-bulb thermometer):
the temperature (in °C) and the wet-bulb temperature
(in °C) are displayed
Measuring mode "Aw" (water activity):
the temperature (in °C) and the water activity (non-
dimensional) are displayed
Measuring mode "Wood":
the wood moisture (in %), the temperature (in °C) and
the selected wood type are displayed
For information on the wood types, see Chapter 5.1
Measuring mode "Building material":
the material moisture (in weight %), the temperature
(in °C) and the selected building material are displayed
For information on the building material types,
see Chapter 5.1
Information and explanations on the individual measuring modes
can be found in Chapter 4 "Application instructions"

Basic Functions
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RH-T 37 BL
2.2.3 Maximum Value Display
In this menu, the maximum air humidity value measured in a
measurement sequence is displayed. This function is only
available in the "rh" measuring mode.
If a maximum value is to be deleted, the
displayed value must be selected with a short
press on the "M" button.
The value blinks and can now be deleted with
a long press of the "M" button.
Afterwards, only the "Max" symbol and the %
symbol are still blinking. With a further short
press of the "M" button, the entry is confirmed
and the device returns to the Ready mode.
With the "M" button, a new measurement can
then be carried out immediately.
Figure 2-4:
deleted max. value
Figure 2-3:
maximum value 1

Basic Functions
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RH-T 37 BL
2.2.4 Minimum Value Display
In this menu, the minimum air humidity value measured in a
measurement sequence is displayed. This function is only
available in the "rh" measuring mode.
If a minimum value is to be deleted, the
displayed value must be selected with a
short press on the "M" button.
The value blinks and can now be deleted
with a long press of the "M" button.
Afterwards, only the "Min" symbol and the %
symbol are still blinking. With a further short
press of the "M" button, the entry is
confirmed and the device returns to the
Ready mode.
With the "M" button, a new measurement
can then be carried out immediately.
Figure 2-2:
minimum value
menu
Figure 2-5:
min. value
Figure 2-6:
deleted min. value

Basic Functions
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RH-T 37 BL
2.2.5 Memory Menu
In this menu, the last 5 measured values are saved. The view and
the respective units depend on the measuring mode selected.
The memory location number "r1" is
displayed for approx. 1 second, and then
the last measured saved value contained
there is displayed.
You can recognize saved values as there is
no "Hold" symbol in the display.
As soon as you select the saved menu, the memory location
number "r1" is displayed for approx. 1 second, and then the last
measured saved value contained there is displayed.
The last 5 measured values are automatically saved and stored in
memory locations "r1" to "r5". The last measured value is in
memory location "r1". This is a ring memory. As soon as the sixth
measured value is recorded, the "first" (first measured) measured
value is automatically removed from the memory.
With a short press of the "M" button, the next memory location "r2"
is selected and the value contained there is displayed. After
reaching the 5th memory location, the first is shown again.
The menu can be exited with the up and down buttons.
Figure 2-7:
memory location "r1"

Specifications
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RH-T 37 BL
3 Specifications
3.1 Technical Data
Display: 3-line display
Display resolution: 0,1 %
Storage conditions: + 5 to + 40 °C
- 10 to + 60 °C (short-term)
Operating conditions: 0 to + 50 °C
- 10 to + 60 °C (short-term)
Dimensions: 160 x 40 x 30 (L x W x H) mm
Weight: approx. 172 g
Active electrode RH-T 37 BL 160
Sensor pipe: 160 x 5,5 mm
Active electrode RH-T 37 BL 320
Sensor pipe: 320 x 5,5 mm
Active electrode RH-T 37 BL FLEX 250
Sensor pipe: 250 x 6,5 mm
Active electrode RH-T 37 BL FLEX 350
Sensor pipe: 350 x 6,5 mm

Specifications
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RH-T 37 BL
3.2 Prohibited Environmental Conditions
Condensation, air humidity continuously too high (> 85%)
and damp
Permanent presence of dust and combustible gases, fumes
and solutions
Ambient temperatures continuously too high (> +50 °C)
Ambient temperatures continuously too low (< 0 °C)
3.3 Measuring Ranges
Measuring ranges:
Damp: 5 % bis 98 %.
Temperature: -40 °C bis +80°C
3.4 Storage conditions
Data loggers Klima 20 and Klima 30 may only be stored in the
packaging that is supplied by us (also available as accessory). We
will not assume any liability for damages, caused by non-
compliance, to a device or the sensor system that is used in it.
Fumigation from foam materials that have not been supplied by us
may damage the sensor system and lead to falsified measuring
values. Therefore it is particularly important that the device is not
stored in such a material.

Application Notes
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RH-T 37 BL
4 Application Notes
On the following pages, you will find information on the various
measuring modes of the RH-T 37 BL (Chapters 4.1, 4.2 and 4.3)
and on the operation of the device.
4.1 Measuring Air Humidity
4.1.1 Absolute Humidity
The amount of water vapour in g/m³ in the air is termed absolute
humidity. The amount of water vapour cannot exceed a fixed
specified amount.
𝐻𝑢𝑚𝑖𝑑𝑖𝑡𝑦 (𝑎𝑏𝑠𝑜𝑙𝑢𝑡𝑒) = 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑤𝑎𝑡𝑒𝑟 (𝑔)
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑎𝑖𝑟 (𝑚3)
4.1.2 Moisture Saturation
Moisture saturation is the maximum amount of water that can be
contained in a certain volume of air. The higher temperature the
larger the amount of water that can be held in the air.
𝐻𝑢𝑚𝑖𝑑𝑖𝑡𝑦 (𝑠𝑎𝑡𝑢𝑟𝑎𝑡𝑖𝑜𝑛) = 𝑚𝑎𝑥𝑖𝑚𝑢𝑚 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑤𝑎𝑡𝑒𝑟 (𝑔)
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑎𝑖𝑟 (𝑚3)