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METRITEC DENSIT-RT6 User Manual

Hand-probe battery powered densitometer
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DENSIT-RT6
Hand-probe Densitometer
battery powered
User Manual
ENGLISH
M E T R I T E C G m b H  K e e l e n g 1 3  D - 2 4 9 7 5 H u s b y  G E R M A N Y
T e l e f o n + 4 9 ( 0 ) 4 6 3 4 - 9 3 1 5 7 0  F a x + 4 9 ( 0 ) 4 6 3 4 - 9 3 1 5 7 1
s e r v i c e @ m e t r i t e c . d e  w w w . m e t r i t e c . d e

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  • Page 1 DENSIT-RT6 Hand-probe Densitometer battery powered User Manual ENGLISH M E T R I T E C G m b H  K e e l e n g 1 3  D - 2 4 9 7 5 H u s b y  G E R M A N Y T e l e f o n + 4 9 ( 0 ) 4 6 3 4 - 9 3 1 5 7 0 ...

  • Page 2: Table Of Contents

    Content Measurement of the optical density................3 General description ....................... 4 Starting up: Inserting the batteries ................6 Measuring mode ......................7 4.1. Switching ON ......................7 4.2. ZERO adjustment ....................8 4.3. Measuring procedure ..................... 9 4.4. HOLD function ..................... 10 4.5.

  • Page 3: Measurement Of The Optical Density

    1. Measurement of the optical density With radiographic testing, defects in technical equipment or components can be detected on the basis of differences in density of the developed X-ray films. For quality assurance of the film evaluation, the degree of blackening is determined as optical density. Optical density is measured using the transmitted light method according to ISO 5-2 and ISO 5-3.

  • Page 4: General Description

    The portable densitometer is to be used together with a film viewer. The measured value for the film density is the diffuse optical density D in the measuring range 0 to 5. The DENSIT-RT6 consists of a handy measuring instrument and a hand-held probe connected by a 1 m flexible cable.
  • Page 5 Keypad: LIGHT function key for switching cyclically calibrating between 3 levels of backlighting (p. 15ff) (p. 11) DOWN function key for HOLD calibrating Measuring mode: (p. 15ff) the last measured value D is displayed and frozen ZERO (p. 10) ON-/OFF switch Calibrating mode: (p.

  • Page 6: Starting Up: Inserting The Batteries

    3. Starting up: Inserting the batteries The DENSIT-RT6 is powered by 4 standard batteries 1.5 Volt type AA. The required batteries are included in the delivery. For reasons of transport safety, they are delivered in a separate box. The battery compartment is located on the bottom of the device.

  • Page 7: Measuring Mode

    4.1. Switching ON Button Operation Display Commentary press "ZERO" button program starts: V02.0520 ↓ software version appears wait for short "METRITEC" appears METRITEC ↓ briefly automatic zero setting D=0.00 ↓ (after power-on) the present D value D=0.02 is displayed 07-0400 Densit RT-6 DE.2020-08-11...

  • Page 8: Zero Adjustment

    4.2. ZERO adjustment The diffuse optical density measurement is a relative measurement of the luminance with and without film density. The reference value for the optical density of the radiographic image is the luminous surface luminance without X-ray film. This reference value is to be set to zero before each measurement.

  • Page 9: Measuring Procedure

    4.3. Measuring procedure (a) Start with the zero adjustment. Hold the probe exactly vertical to the film viewer's internally illuminated diffusion plate, as exactly as possible at the point where the X-ray film is to be evaluated. press "ZERO" button zero setting: ZERO ↓...

  • Page 10: Hold Function

    4.4. HOLD function This function can be used to hold a current measured value. The density value is held flashing in the display. the last measured press "HOLD" button D value is maintained; flashing display D=3.12 press again return to measuring 4.5.

  • Page 11: Setting The Backlight

    4.6. Setting the backlight The digital display of DENSIT-RT6 has an orange backlight, which makes the operator's work more comfortable. Three levels are available. By pressing the "LIGHT" key, the desired brightness level can be set. backlight level 1: D=0.02...

  • Page 12: Calibration

    5. Calibration The calibration of DENSIT-RT6 is done conscientiously by us as the manufacturer on a registered BAM-tested reference density strip and should only be carried out by authorised specialists on an annual basis. To avoid measurement errors, the quality of the film viewer and the reference density strip should be ensured.
  • Page 13 Calibration procedure overview: Specials in Calibration Mode: ∗ The asterisk "D " indicates the Calibration Mode. 3 decimal places are available for the calibration function. The measuring procedure is unchanged and is started with the zero adjustment. If calibration factor A is being changed, the display is indicating e.g. DA=3.982. If calibration factor B is being changed, the display is indicating e.g.
  • Page 14 Calibration procedure in detail: ∗ Note: Example values. For reasons of clarity, " " and the third decimal place have been omitted in the presentation. 07-0400 Densit RT-6 DE.2020-08-11...

  • Page 15: One-Factor Calibration Procedure

    5.1. One-factor calibration procedure For an overview of the digital calibration procedure, see above pages 13 and 14. The following is a step-by-step guide to one-factor calibration. 1) Enter Calibration Mode keep both arrow keys CaliMode starting Calibration Mode pressed for 3 seconds D * =3.962 wait for short the present D value...
  • Page 16 3) Set calibration factor A: Place the reference density strip (BAM) and measure a darker reference value; for example D = 4.07 present deviation D * =4.014 read of actual value ∆D from setpoint press or tap DA=4.071 set factor A one of the arrow keys D * =4.073 release...
  • Page 17 a) Quit CaliMode with saving CaliSave press "HOLD" button "CaliSave" appears briefly Save Yes / No? YES/NO automatic query Cursor flashes "Y" new setting for factor A press "HOLD" Saved has been saved, to confirm quit CaliMode b) Exit CaliMode without saving CaliSave press "HOLD"...

  • Page 18: Two-Factor Calibration Procedure

    5.2. Two-factor calibration procedure For two-factor calibration, also start by adjusting calibration factor A. Start by following the step-by- step guide from page 15 to point 4). 5) To then set calibration factor B, select a brighter reference value on the reference density strip;...
  • Page 19 6) Now factor A must be recalibrated in any case (!). Repeat the steps from point 3 until the nominal/actual value tolerance is maintained over the entire measuring range (see figure "2- factor calibration", p.14 below). 7) End the two-factor calibration with or without saving: a) quit CaliMode with saving CaliSave press "HOLD"...
  • Page 20 b) exit CaliMode without saving CaliSave press "HOLD" button "CaliSave" appears briefly Save Yes / No? YES/NO automatic query Cursor flashes "Y" ove cursor with Save Yes / No? YES/NO Cursor flashes "N" "UP" key cancel, new settings for press "HOLD" NotSaved A and B not accepted, to confirm...

  • Page 21: Battery Indicator

    6. Battery indicator When the DENSIT-RT6 is switched on, the battery status is continuously monitored. A battery warning is only given if the supply voltage is outside the operating limits. Possible displays: "LOW BATT" = LOW BATT automatic display batteries too low "HI.

  • Page 22: Technical Data

    7. Technical data Measuring range "diffuse optical density D": 0 - 5.0 ∆D = ± 0.01 for D ≤ 4.8 Measuring accuracy: ∆D = ± 0.03 for D > 4.8 Repeat accuracy: ± 0.01 Range of application: 550 - 320.000 cd/m² Sensor aperture diameter: Ø3 mm Powered by standard batteries:...

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