Heiland DensitometerTRD 2

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Measurement of B&W films and papers in reflection and transmission mode.

Dual mode for reflection and transmission measurement. Suitable for density measurement of B&W RC, FB and inkjet papers as well as films for photography. The measurement results are continuously taken and displayed in units of logarithmic density (log.D) and zones (TRD Z only).

The following applications are given as a brief introduction how to benefit of density measurement.

Calibration of multigrade papers and enlargers
Calibration of film and developer
Determination of true film speed
Determination of contrast and range

Heiland densitometers are build in a solid metal box and are powered by 12V by means of a wall plug power supply, that is included in delivery. The densitometer consists of the base unit and the measurement arm (lever). Both parts are connected via a precise bearing, the integrated spring pushes the arm in the upper position after releasing.
The probe is mounted underneath the lever. The transmission measurement light is emitted through an opal diffuser, for reflection measurement, the directed light is emitted under 45 deg. to the paper. The top of the base unit serves as a platform, where the film or paper rests during measurement.
The illumination and display are activated automatically when the measuring arm is lowered down. The 3-digit LED display allows a precise reading.

Various models to meet your specific requirement

The TRD 2 densitometer is mainly used in general photographic applications, like calibration of B&W films or multigrade paper. Additionally it is used for the process control of X-ray films. It is equipped with a fixed aperture of 3mm.

The TRD Z instrument is specialised for usage in the zone system. The reading can be done in units of log. density or zones. The reference points Dmin and Dmax can be set independently.

Easy working procedure

Connect the instrument to main power. Lower the lever slightly down. Choose the measurement mode (transmission/reflection) and the display mode (for the TRD Z logD or zone). Depending on the item to be measured, place the fog area of a film or the unexposed edge of a paper in the middle of the aperture. Reset the display using the “Min” button, for the TRD Z set also the max. density of the paper with the “Max” button. Centre the measurement area of your film or paper and fully press down the lever again for taking the measurement result.
Measurements are done continuously and results are displayed (about 3 measurements per second), so the item may be shifted to various position while measuring.

Factory calibrated

The instrument is calibrated at the factory. A certification document is shipped with the instrument using two calibration strips with documented density values. Normally the densitometer does not need to be recalibrated within years.