Schaller LF-TD 60 Air Humidity Transmitter Series User Manual

Moisture meter
LF-TD 60
Operating Manual
Air humidity transmitter series

Always read this operating manual before using the LF-TD 60!
Version 2.5

Your LF-TD 60 at a glance

The main unit

Introduction

1.1 Information about this operating manual
This operating manual is designed to enable you to use the LF-TD 60 safely and effectively. It is part of the device, has to be stored nearby and must be easily accessible to  users at all times.
All users are required to carefully read and make sure that they have understood this operating manual before using the LF-TD 60. All of the safety and operating instructions  detailed in this manual have to be observed to ensure the safety of the device.

1.2 Limitation of liability
All of the information and instructions provided in this operating manual have been compiled on the basis of the current standards and regulations, the state of the art, and  the extensive expertise and experience of Schaller Mess Technik GmbH.
Schaller Mess Technik GmbH does not accept any liability for damage associated with the following, which also voids the warranty:

• Non-observance of this operating manual
• Improper use
• Inadequately qualified users
• Unauthorised modifications
• Technical changes
• Use of unapproved spare parts

This fast measuring procedure can be affected by a range of different factors.
We, as the manufacturer, do not accept any liability for any incorrect measurements and associated consequential damage.

1.3 Symbols used in this manual
All of the safety information provided in this manual is shown with a corresponding symbol.

ATTENTION
It is essential to observe this warning. Non-compliance can lead to damage to property or equipment.

Information
This symbol indicates important information that enables users to use the device more efficiently and cost-effectively.

1.4 Customer service
For technical advice, please contact our customer service department at:
Schaller Mess Technik GmbH
Max-Schaller-Strafe 99
A – 8181 St.Ruprecht an der Raba
Telephone: +43 (0)3178 28899
Fax: +43 (0)3178 28899 – 901
E-mail: info@humimeter.com
Internet: www.humimeter.com
© Schaller Mess Technik GmbH 2023

Information
Your purchased measuring instrument can be calibrated, and the adjustment checked by using suitable test ampoules / calibration ampoules. For this purpose, use only the calibration solutions distributed by Schaller Messtechnik Gmbh.
You can download a calibration certificate for your test ampoules / calibration ampoules with the batch number printed on the ampoul  from https://www.humimeter.com/certificates/.

For your safety

The device complies with the following European directives:

• Restriction of Hazardous Substances in Electrical and Electronic Equipment (RoHS)
• Electromagnetic compatibility (EMC)
  The device corresponds to state-of-the-art technology. However, it is still associated with a number of residual hazards.
  These hazards can be avoided through strict observance of our safety information.

2.1 Proper use

• Transducer for measuring and transmitting relative humidity and temperature in fixed installation
• The sensor technology used makes it possible to detect even small fluctuations in humidity and their tendencies quickly and reliably so that preventive actions can be  taken.
• For some applications (e.g. installation in sewage pipes) it is necessary to use a remote measuring probe for the reason of temperature adjustment.

2.2 Improper use
• The device must not be used in ATEX.

2.3 User qualifications
The device must only be operated by people who can be expected to reliably take the measurements. The device must not be operated by people whose reaction times may be  slowed due to, e.g. the use of drugs, alcohol or medication.
All persons using this device must have read, understood and follow the instructions provided in the operating manual.

2.4 General safety information
The following safety information has to be observed at all times to avoid damage to objects and injury to people:
• In case of damages or loose parts on the device, contact Schaller Mess Technik GmbH or your dealer.
All of the device’s technical features have been inspected and tested before delivery.
Every device has a serial number. Do not remove the tag with the serial number.

2.5 Warranty
The warranty does not apply to:

• Damage resulting from non-observance of the operating manual
• Damage resulting from third-party interventions
• Products that have been used improperly or modified without authorization
• Products with missing or damaged warranty seals
• Damage resulting from force majeure, natural disasters, etc.
• Damage from improper cleaning

On receipt of your device

3.1 Taking the device out of its packaging

• Take the device out of its packaging.
• Next, make sure that it is not damaged and that no parts are missing.

3.2 Making sure that all of the components have been included
Make sure that all of the components have been included by checking the package contents against the following list:

3.2.1 Scope of supply

• LF-TD 60
• Connecting cable of 1.9 m length
• Operating manual

Optional accessories:

• Display for LF-TD
• Display with keypad for LF-TD
• Relay output for moisture for LF-TD
• Mounting bracket for LF-TD
• Drip-catcher for LF-TD
• RS232 interface – described in a separate operating manual
• USB interface – described in a separate operating manual
• Custom-made design – flat rate for air humidity transmitter series per order
• Factory calibration certificate, calibration equipment, certified calibration ampoules and reference devices – for continuous monitoring

Installation of the transmitter

4.1 Laying of the supply line or transmission line

• The cable must not be laid in the area of interference fields.

• Do not operate the transmitter in the area of electromagnetic interference fields.

• The permissible cross-sections for the installation must be observed.

• The cable length must be kept as short as possible.
  » If an extension of the cable is required, the cross-section of the extension must not be below 0.25 mm2.

• If the electronics housing and the display electronics are grounded, an appropriate equipotential bonding conductor must be provided.

4.2 Mounting the transmitter

• The measuring probe must be positioned at a representative location.
  » Avoid positions of draught and unnatural temperature fluctuations.
  » Do not expose the device to direct sunlight.

• If the sensor tube is twisted, the tightness is no longer guaranteed.

• When there is a possibility of condensation, position the sensor probe slightly upwards (approx. 10 degrees angle).
  » The condensation water can then flow away from the sensor probe towards the housing or cable and drain off.
  » If it is impossible to place the unit at an upward angle, a drip nose (optional accessory) must be installed.

• Installation inside an air duct (or at mounting locations where temperature differences between sensor probe and sensor housing may occur:
  » The sensor must be inserted fully into the opening until it stops, to avoid a temperature drop along the sensor tube. See sketch:

4.3 Pin assignment

ATTENTION
Damage to the electronics due to incorrect connected cables
Incorrect connected cables can lead to severe damage to the electronics.
► Connect all cables correctly.

4.4 Wiring diagram

Technical drawing LF-TD 60

Adjustment behaviour of the sensor

In humidity and temperature measurement, several parameters are responsible for the adjustment behaviour (time until the actual measured value is displayed). The parameter  responsible for the highest measuring error is a temperature discrepancy between the sensor resp. the whole measuring instrument and the material being measured resp. the air.
Therefore, let the device adjust until the displayed temperature corresponds to the actual temperature. The graph below shows how long it takes to adjust from 20 °C to 30 °C.

To demonstrate the importance of temperature adjustment, the table below shows the measuring errors due to a temperature difference between the measuring instrument and the material being measured of only 1 °C / 1.8 °F, at different ambient temperatures.

| 10 °C (50 °F)| 20 °C (68 °F)| 30 °C (86 °F)
---|---|---|---
10 % r.h.| +/- 0.7 %| +/- 0.6 %| +/- 0.6 %
50 % r.h.| +/- 3.5 %| +/- 3.2 %| +/- 3.0 %
90 % r.h.| +/- 6.3 %| +/- 5.7 %| +/- 5.4 %

At room temperature (20 °C / 68 °F) and an assumed humidity value of 50 % relative humidity a temperature difference between the measuring sensor and the material being  measured of 1 °C / 1.8 °F causes a measurement error of 3.2 % relative humidity.
A temperature difference of 3 °C / 5.4 °F would cause a measurement error of more than 10 % relative humidity.

Definition relative humidity

Indicates the relationship between the current water vapour pressure and the maximum possible, the so-called saturation vapour pressure. The relative humidity shows the degree the air is saturated with water vapour. Examples: 50% relative humidity: At the current temperature and pressure, the air is half saturated with water vapour. 100% relative humidity means that the air is totally saturated with water vapour. If the air has more than 100% humidity, the excessive humidity would condense or precipitate as mist.

7.1 Application range
Within the normal application range (normal range) the accuracy of the device is as indicated. A long-term application beyond the normal application range (max. range), particularly at an air humidity of more than 80%, can lead to higher measuring errors. Back in the normal application range, the sensor will return to the indicated accuracy automatically.

Cleaning and maintenance

Regularly cleaning and maintaining the device will ensure that it will have a long service life and stay in good condition.

8.1 Care instructions

• Do not leave the device out in the rain.
• Do not immerse the sensor in water.
• Do not expose the device to extreme temperatures.
• Protect the device from strong mechanical shocks and loads.

8.2 Cleaning the device
ATTENTION
Do not clean with fluids
Water or cleaning fluid getting inside the device can destroy the device.
Only clean with dry materials.
Aluminum housing and sensor tube
Clean the aluminum housing and the sensor tube with a dry cloth.
Air humidity and temperature sensor
The air humidity and temperature sensor cannot be cleaned. In case of a polluted sensor please contact your dealer.

Checking the calibration

To do so: Calibration equipment (art.no.10006) and calibration ampoules (humidity standards art.no. 10005) required. The device, the calibration equipment and the humidity  standards must have a temperature between 20.0 °C and 26.0 °C. It is recommended to store the device, the calibration equipment and the calibration ampoules in a room  with little temperature fluctuation for 24 hours.

9.1 Assembling the calibration equipment

1. Place the sealing ring over the threads of the lower part like shown in figure 1.
2. Place the textile pad into the lower part (figure

2. and carefully pour the humidity standard onto the pad, beginning with the humidity standard of 35 % relative humidity.

3. Carefully place the upper part onto the lower part (figure 3) and tighten the upper part clockwise.
   » Recommendation: Keep the lower part on the table while screwing on the upper part.
   » If necessary, only lift the calibration equipment straight up and do not tilt or turn it over.

4. Loosen the fixing nut counterclockwise until the sensor tube of the measuring device can be inserted without excessive pressure.

5. Now carefully push the sensor tube of the measuring device into the upper part until it stops (figure 4).

6. Secure the calibration equipment on the sensor tube by tightening the previously loosened fixing nut.
   » Make sure to lift the device with the calibration equipment only straight up and do not tip or turn it over Otherwise you could damage the sensor.
   » Do not remove the calibration equipment from the sensor tube until specifically indicated otherwise.
   » Place a distance holder under the device so that the device and the calibration equipment lay horizontally on the table.

ATTENTION
Damage to the sensor
By tilting or turning the device with mounted calibration equipment the sensor can be destroyed.
Only lift the device with mounted calibration equipment straight up.

9.2 Determining the deviation

1. Let the sensor adjust to the humidity standard for at least 2 hours.

2. Then note down the measured relative humidity and temperature.

3. At ideal temperature conditions (device, calibration equipment and humidity standard have a temperature of 23 °C), the value printed on the humidity standard can be  used as reference value.

4. In case of deviation from the factory temperature (23.0 °C), the real humidity value must first be determined according to the table below.
   Temperature| Humidity standards
   ---|---
   | 35%| 50%| 80%
   20 °C| 34.60%| 49.80%| 79.90%
   21 °C| 34.80%| 49.80%| 80.00%
   22 °C| 34.90%| 49.90%| 80.00%
   23 °C| 35.00%| 50.00%| 80.00%
   24 °C| 35.10%| 50.10%| 80.00%
   25 °C| 35.20%| 50.20%| 80.00%
   26 °C| 35.40%| 50.20%| 80.10%

5. Note down the real humidity value.

6. Compare the noted displayed measuring value with the real humidity value.
   » If the deviation revealed is below 1.5 % relative humidity, it is not recommended to recalibrate.
   » If the deviation revealed is more than 1.5 % relative humidity, please contact your dealer.

7. Now remove the calibration equipment from the sensor tube and repeat the procedure from “9.1 Assembling the calibration equipment”, optionally with the humidity  standard 50 % relative humidity or the humidity standard 80 % relative humidity.

Faults

If the measures listed below fail to remedy any faults or if the device has faults not listed here, please contact Schaller Mess Technik GmbH.

-20 °C and +60 °C.
| Measurement error due to too short temperature adjustment time| Let the device adjust to the surroundings (see “6. Adjustment behaviour of the sensor”).
| Sources of heat or cold that do not correspond to the surround- ding temperature| Reposition your device at a location that is representative for the room climate.
| Dripping water or sprayed water| Direct contact of the sensor with dripping or sprayed water will destroy it.
| Irreversible damage of the seen- soar due to aggressive gases| Please contact your dealer.
| Condensation caused by a change in temperature| Condensation on the sensor interferes with the calibration. Let the device adjust to the surrounding temperature.
| Polluted air humidity and teem- prelature sensor| Please contact your dealer.
| Foreign particles on the sensor| Please contact your dealer.

Storage and disposal

11.1 Storing the device
The device must be stored as follows:

• Do not store outdoors.
• Store in a dry and dust-free place.
• Protect the device from sunlight.
• Avoid mechanical shocks/loads.
• Storage temperature: -20 °C to +60 °C

11.2 Disposing of the device
**** Devices marked with this symbol are subject to Directive 2012/19/
EU of the European Parliament and of the Council of 4 July 2012 on waste electrical and electronic equipment (WEEE).
If the device is being operated outside the European Union, the national regulations on the disposal of such devices that apply in the country of use must be observed.
Electronic devices must not be disposed of as domestic waste.
The device must be disposed of appropriately using appropriate collection systems.

Device information

12.1 EC declaration of conformity
DECLARATION OF CONFORMITY

A – 8181 St. Reperch
 Product designation:|  Schaller
Type designation:| F-TD-A ; LF-TD 60 ; LF-TD 90 ; LF-TD 120 ; LF-TD 150; LF TD 180 ; LF-TD-E ; LF-TD-U ; LF-TD-ER ; LF-TD Profaned ; LF-TD-H
Product description| Measuring instrument for determining relative humidity and derived measured variables

The designated product is in conformity with the European directives:
EMV – Richtlinie 2014/30/EC
EMC Directive 2014/30/EU
RoHS – Richtlinie 2011/65/EG
RoHS-Directive 2011/65/EU

Full compliance with the standards listed below proves the conformity of the designated product with the provisions of the above-mentioned EC Directives:

EN 61326–1:2013| Electrical equipment for measurement, control, and laboratory use – EMC requirements
---|---
EN IEC 63000:2019-05
EN 50581:2012| Technical documentation for the assessment of electrical and electronic products with respect to the  restriction of hazardous substances.

In case of any changes not agreed upon with the manufacturer, this declaration of conformity loses its validity.
St. Reperch a.m. Raba, 31.07.2022

Legal binding signature of the issuer

DECLARATION OF CONFORMITY

Name/ address of manufacturer:| Schaller Mess Technik GmbH
Max-Schaller-Strafe 99
A – 8181 St. Reperch
---|---
Product designation:| Schaller
Type designation:| LF-TD-A ; LF-TD 60 ; LF-TD 90 ; LF-TD 120 ; LF-TD 150; LF- TD 180 ; LF-TD-E ; LF-TD-U ; LF-TD-ER ; LF-TD Profaned ; LF-TD-H
Product description:| Measuring instrument for determining relative humidity and derived measured variables

The designated product is in conformity with the following directives:

• Electromagnetic Compatibility Regulations 2016 Great Britain
• RoHS-Directive 2011/65/EU Directive on the restriction of the use of certain hazardous substances in electrical and electronic equipment

Full compliance with the standards listed below proves the conformity of the designated product with the provisions of the above-mentioned Directives:

EN 61326–1:2013| Electrical equipment for measurement, control, and laboratory use – EMC requirements
---|---
EN IEC 63000:2019-05 replaced
EN 50581:2012| Technical documentation for the assessment of electrical and electronic products with respect to the restriction  of  hazardous substances.

For the mentioned product, a complete documentation with manual of instruction in original version is available.
In case of any changes not agreed upon with the manufacturer, this declaration of conformity loses its validity.
St. Reperch a.m. Raba, 31.07.2022

Legal binding signature of the issuer

12.2 Technical data

(electronics)
Outputs| rel. air humidity (4 – 20 mA)
-Scaling (0 % to 100 0/0) Temperature (4 – 20 mA)
-Scaling (-20 °C to +60 °C)
Working resistance < 500 Ohm (UB 24 V)
Temperature compensation| Automatic
Power supply| 12 to 29 VDC
Current consumption| 18 mA (without interfaces, display or any bus systems)
Electrical  connection| Connection cable 1.9 m
Housing dimensions| 70 x 32 x 120 mm
Housing material| Anodized aluminums
Sensor tube dimensions| 12 x 100 mm
Sensor tube material| Plastic
Sensor cap| Plastic with filter paper
IP rating electronics housing| IP 54

Schaller Messtechnik develops, produces and sells professional moisture meters and turnkey solutions.

Schaller Mess Technik GmbH
Max-Schaller-Strafe 99, A – 8181 St. Reperch an der Raba
Tel +43 (0)3178 – 28899 , Fax +43 (0)3178 – 28899 – 901
info@humimeter.com, www.humimeter.com

References

• art.no
• Prüfampullen - Schaller Messtechnik
• Homepage - Schaller Messtechnik

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