How it Works
TRAMEX
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MRH III
Instruction Manual
17 pgs409.54 Kb0

TRAMEX MRH III Instruction Manual

Checkline-Europe
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NOTES
Checkline-Europe
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TABLE OF CONTENTS
1.0 Introduction ……………………………………………………………. 2
2.0 How it works …………………………………………………………… 3
3.0 Instrument Features …………………………………………………. 4
4.0 Operating Instructions ……………………………………………….. 5
5.0 Non-destructive measurement mode ………………………………. 6
6.0 Wood pin meter (Pin Probe) mode …………………………………. 7
7.0 Typical MRH Displays ……………………………………………….. 8
8.0 Humidity Measurement Mode ………………………………………. 9
9.0 Working with your MRH ……………………………………………… 10
9.1 Roof Scale
9.2 Masonry Scale
9.3 Drywall Scale
9.4 Laminate Scale
9.5 Wood Scale
9.6 Relative humidity and moisture content
9.7 Wood Flooring
9.8 Chemical treatment or contamination
10.0 Table of Wood Specific Gravities (S.G.) …………………………… 16
11.0 Wood Pin Meter Mode ………………………………………………. 18
12.0 Species Correction Chart ……………………………………………. 21
13.0 RH Probe ……………………………………………………………… 28
13.1 Calibration checking of RH Probe
14.0 Calibration …………………………………………………………….. 30
15.0 Limitations …………………………………………………………….. 30
16.0 Product development ………………………………………………… 30
17.0 Warranty ………………………………………………………………. 31
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1.0 INTRODUCTION
Thank you for selecting a new MRH instrument. The MRH has 3 modes of operation:
1. The MRH utilises “state of the art” electronic technology to provide you with an accurate and easy to use non-invasive instrument for non-destructive testing (NDT) of Moisture Content (MC) and tracing moisture in a wide range of building materials.
2. By inserting one of the optional plug-in electrodes for wood and selecting Pin Probe the instrument can then be use in Pin Probe (wood pin-meter resistance measurement) Mode. This enables the MRH to measure the percentage moisture content (%m.c.) of wood and give an indication of the moisture content of wood-based products.
3. By inserting the optional plug-in RH-probe, the instrument automatically changes to hygrometer mode. This enables the MRH to measure relative humidity (RH), temperature, dew-point temperature and mixing ratio of the environment or equilibrium relative humidity in a structural material. A structural material such as a concrete slab can be tested using the in-situ (ASTM F2170) or RH Hood (ASTM F2420) methods and British standards BS 5325 and BS 8203.
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17.0 WARRANTY
Checkline Europe (Checkline) warrants to the original purchaser that this product is of merchantable quality and confirms in kind and quality with the descriptions and specifications thereof. Product failure or malfunction arising out of any defect in workmanship or material in the product existing at the time of delivery thereof which manifests itself within one year from the sale of such product, shall be remedied by repair or replacement of such product, at Checkline’s option, except where unauthorized repair, disassembly, tampering, abuse or misapplication has taken place, as determined by Checkline. All returns for warranty or non-warranty repairs and/or replacement must be authorized byCheckline, in advance, with all repacking and shipping expenses to the address below to be borne by the purchaser.
THE FOREGOING WARRANTYIS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE WARRANTYOF MERCHANTABILITYAND FITNESS FOR ANYPARTICULAR PURPOSE OR APPLICATION. CHECKLINE SHALL NOT BE RESPONSIBLE NOR LIABLE FOR ANYCONSEQUENTIAL DAMAGE, OF ANYKIND OR NATURE, RESULTING FROM THE USE OF SUPPLIED EQUIPMENT, WHETHER SUCH DAMAGE OCCURS OR IS DISCOVERED BEFORE, UPON OR AFTER REPLACEMENT OR REPAIR, AND WHETHER OR NOT SUCH DAMAGE IS CAUSED BYMANUFACTURER’S OR SUPPLIER’S NEGLIGENCE WITHIN ONE YEAR FROM INVOICE DATE.
Some State jurisdictions or States do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation may not apply to you. The duration of any implied warranty, including, without limitation, fitness for any particular purpose and merchantability with respect to this product, is limited to the duration of the foregoing warranty. Some states do not allow limitations on how long an implied warranty lasts but, not withstanding, this warranty, in the absence of such limitations, shall extend for one year from the date of invoice.
CHECKLINE EUROPE Dennenweg 225B, 7545 WE, Enschede Tel: +31-88-0029000 / Fax: +31-88-0029009
Every precaution has been taken in the preparation of this manual. Checkline­Europe assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of information contained herein. Any brand or product names mentioned herein are used for identification purposes only, and are trademarks or registered trademarks of their respective holders.
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14.0 CALIBRATION
For regular on-site assessment of your MRH in moisture measurement mode, a calibration-check box is available from the suppliers of your MRH. Should it be found that readings are outside the set tolerances, it is recommended that the MRH be returned for re-calibration. Calibration adjustments should not be carried out by anyone other than Checkline Europe who will issue a calibration certificate on completion.
Requirements for quality management and validation procedures, such as ISO 9001:2008, have increased the need for regulation and verification of measuring and test instruments. It is therefore recommended that calibration of the MRH should be checked and certified in accordance with the standards and/or protocols laid down by your industry (usually on an annual basis) by an authorized test provider. The name of your nearest test provider and estimate of cost is available on request.
15.0 LIMITATIONS
The MRH will not detect or measure moisture through any electrically conductive materials including metal sheeting or cladding, black EPDM rubber or wet surfaces.
16.0 PRODUCT DEVELOPMENT
It is the policy to continually improve and update all its products. We therefore reserve the right to alter the specification or design of this instrument without prior notice.
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2.0 HOW IT WORKS
In non-destructive moisture measurement mode i.e. without the plug in probes, the instrument operates on the principle that the electrical impedance of a material varies with its moisture content. The electrical impedance is measured by creating a low frequency alternating electric field between the electrodes as illustrated in Figure 1 below.
This field penetrates the material under test. The very small alternating current flowing through the field is inversely proportional to the impedance of the material. The instrument detects this current, determines its amplitude and thus derives the moisture value.
Figure 1
In Pin Probe Mode (i.e. with pin probe mode selected and an electrode plugged in), the MRH is a resistance type pin meter for determining the percentage moisture content of wood.
In Hygrometer mode (i.e. with the RH Probe plugged in), the MRH determines the capacitance of the RH probe sensor, which varies with the relative humidity of the test area environment. The MRH displays this capacitance as percentage relative humidity (%RH). It also measures temperature and displays dew-point temperature and mixing ratio.
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3.0 INSTRUMENT FEATURES
Your MRH employs advanced digital technology to enable the incorporation of many features, which are listed below.
3 modes of measurement: Non-destructive moisture measurement, hygrometer
and wood pin probe.
simple membrane keypad controls:
ON/OFF SCALE UP DOWN HOLD/AUDIO BACKLIGHT
5 Scales: Wood, Roof, Masonry, Drywall and Laminate. These are selected
using the key and the or keys.
Moisture readings and scale are displayed on a clear easy to read liquid crystal
display (LCD).
Relative Humidity (RH) readings, probe temperature, dew-point temperature and
mixing ratio are automatically displayed when the RH Probe is plugged into the MRH (Hygrometer Mode).
The Roof, Masonry, Drywall and Laminate Scales use a reference/comparative
scale that is displayed both numerically (0-99) and in a bar form on the bottom line of the display. The display also shows low (LO), medium (MD) and high (HI) readings for these scales.
These do not necessarily indicate low, medium or high levels of moisture but indicate the area of the 0-100 comparative scale where the reading lies.
Example
To conserve battery life, the instrument automatically powers OFF after 10
minutes of inactivity or when the key is pressed. If a key is pressed the power off will
Backlit display allows the display to be easily read in poor light conditions. This
is enabled by pressing the key. The backlight stays on for a period of 30 seconds.
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13.1 Calibration checking of RH Probe
Each RH probe is factory calibrated using precision equipment traceable to NIST standards. With reasonable care in use and storage, RH probe measurements should remain within the ±3% specification. RH probe accuracy can be degraded by exposure to polluted atmospheres such as dust, aggressive chemical vapors, or contaminated wetting. It is thus advisable to periodically check the RH Probe accuracy by using RH 75 or a similar suitable reference kit. These kits contain a saturated Sodium Chloride salt solution that creates a nominal 75% relative humidity within the measuring cell. The precise relative humidity is temperature dependent. The RH 75 calibration check is available from the manufacturer or the supplier of your MRH meter.
To carry out a calibration check:
1. Remove cell from sealed plastic bag.
2. Remove white stopper plug from cell.
3. Insert plastic calibration sleeve into cell as shown in photo on left.
4. Remove sleeve stopper plug and fully insert RH probe.
5. Place cell/probe in a stable, draft free, temperature environment, e.g., inside a desk drawer, and leave for at least 2 hours.
6. After 2 hours, connect probe to MRH and measure RH value.
7. The RH reading should be 75% ± 3%
8. If the value is outside this range, repeat the test after a further 2 hours.
9. If the RH value is still outside specification, return the RH probe for investigation.
10. When the calibration check test has been completed, removeRH probe and sleeve from cell. Fit white stopper plug into cell and seal cell inside the plastic bag.
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13.0 RH PROBE
The RH Probe utilises “state of the art” electronic technology to provide an “easy to use” and accurate method for measuring relative humidity, mixing ratio, temperature and dew point in a wide range of applications such as:
Heating, ventilation and air conditioning (HVAC) systems. Environmental and building monitoring. Building inspection. Flooring (including ASTM F 2170 In Situ & ASTM F 2420 RH Hood methods)
A typical MRH display with the RH Probe attached is shown on page 8. Pressing the
on the instrument changes the temperature readings from ºC to ºF, the mixing
ratio from g/kg (gms) to Grains/Lb (GRN) or vice-versa.
NOTE: When performing Humidity tests on Concrete Flooring it should be noted that:
A) If artificial aids for accelerated drying of concrete are being used it is
recommended that they be turned off at least four days before taking final readings.
B) It is important that the installer ensures that the floor covering is applied at the
moisture content and or relative humidity specified by the manufacturer of the floor coverings and/or adhesives.
C) It is very important that RH probes are handled with care and protected from
harsh environments in order to maintain their long-term stability. It is recommended that you do not insert the RH probe into concrete until the chemical reaction between the cement and water has taken place and the drying process has begun. To achieve this it is recommended that you do not insert the probe into the hole in the concrete until the moisture content of the concrete has dropped below 5% when measured with a CME4, CRH or CMEX. RH probes should not be left enclosed in concrete or similar environments at an RH level greater than 93% for long periods, in these situations it is recommended to remove the RH probe and allow the test area to continue to acclimatise by replacing the stopper in the hole-liner sleeve.
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When the battery requires replacement a LOW BATTERY message is shown on
the LCD.
HOLD freezes reading to facilitate ease of recording readings. When the MRH is
in HOLD mode, ‘H’ will flash on the display.
If HOLD was selected prior to the MRH automatically powering off, the frozen
display reading is digitally memorized and restored next time ON is selected.
4.0 OPERATING INSTRUCTIONS
Figure 2
A diagram of the instrument face with brief notes on the push button controls and LCD is shown above (Figure 2).
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5.0 NON-DESTRUCTIVE MEASUREMENT MODE
1. Press the
key to power up. With no RH probe or pin probe connected the last
used scale will be displayed on the LCD. Press
key again to power off.
2. To change scale, press key to select the wood scale or the comparative material scales. Select the required material scale using the
or key.
3. Hold your MRH directly on the wood, roof, masonry, drywall or other material being tested, ensuring both conductive-rubber electrodes are fully in contact with the surface
4. For the Roof, Masonry, Drywall and Laminate scales the readings are comparative from 0 to 99. A visual indication is also given by the bar display on the bottom line of the LCD. The display also shows low (LO), medium (MD) and high (HI) readings for these scales. LO is displayed for readings from 0 to 30, MD for readings from 31 to 70 and HI for readings from 71 to 99.
These do not necessarily indicate low, medium or high levels of moisture but indicate the area of the 0-100 comparative scale where the reading lies.
5. The readings on these scales are not to be interpreted as a measurement of percentage moisture content (% MC) or relative humidity (RH). It is not a relative humidity reading and it does not have any linear correlation with Relative Humidity measurements. This scale should be regarded as a comparative or qualitative scale only.
6. When the Wood Scale is selected the moisture content (MC) in percent of wood is shown on the right-hand side of the bottom line of the display. The left-hand side of this line shows the specific gravity (SG) being used.
The SG is changed by using the or key to adjust to the required SG value. The range of SG covered is 0.30 to 0.80. The S.G. increases and decreases in increments of 0.01
7. A chart showing the approximate specific gravity of a wide range of different species is shown on pages 16 and 17. For SG greater than 0.80 please refer to species adjustment table (Table 2 on Page 14).
8. To turn audio tone on or off, press key twice in quick succession.
9. The MRH will automatically power-off after ten minutes if no key is pressed. If a key is pressed the power-off will be extended for an additional ten minutes.
10. To freeze readings press the key once. While on HOLD, H will flash slowly on the upper line of the display. If the unit powers OFF while on HOLD, the frozen meter reading is digitally memorized and restored next time ON is selected. To remove freeze, press
key again.
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