Colorimeter PCE-TUM 20

Colorimeter PCE-TUM 20
Instrument Laboratorium

Deskripsi produk
DESCRIPTION
Portable turbidimeter according to ISP 7027 /
Two automatic switching measuring ranges between 0 ... 50 NTU and 50 ... 1000 NTU

The turbidimeter is a handy device equipped with a large display, fulfilling all standards for a turbidity analysis on-site. The measuring range of 0 ... 1000 NTU is separated into two automatically switching measuring ranges for purposes of increasing the accuracy of the turbidimeter. With a well-arranged keyboard the turbidimeter is easy to operate. LED's are used as a light source, which work with a wave length of 830 nm in infrared ranges of light, and by that are invisible to the human eye.



Since the measurement is not performed in a visible range, possible pigmentation of the sample plays a minor role during measurement. Due to a formation of the photodiodes in a 180 ° and 90 ° angle, transmitted light measurement is performed for higher ranges whereas diffused light measurement is used for lower ranges. With the reference standards of 0 NTU and 100 NTU included in the delivery, the turbidimeter can be calibrated or adjusted at any time. The turbidimeter PCE-TUM 20 fulfills according to EN 27027 / ISO 7027 all acquired standards.



Units
The turbidimeter PCE-TUM 20 displays the measurement results in NTU units (Nephelometric Turbidity Unit). This unit is preserved in the ISO standards. NTU is identical with FTU (Formazine Turbidity Unit). Furthermore there are two more units in practice for turbidity: JTU and SiO2. JTU (Jackson Turbidity Unit) is equal to 19 NTU, while the Silicia Unit equals 7.5 NTU.

Measuring Principle


Inside the turbidimeter there is an infrared LED installed with 850 nm as a light source. A photodiode positioned in a 90 ° angle to the measuring ray absorbs the light reflected by the particles in the dissolution (diffused light or nephelometric measuring methods for lower measuring range). For higher measuring ranges an additional photodiode is positioned at the opposite side (measurement is performed via transmitted light method). By that the meter determines the turbidity in NTU (FTU). By using infrared LED even measurement of colored dissolution e.g. red wine is possible.

HIGHLIGHTS
- Large LCD display 41 mm x 34 mm
- Real-time clock
- High accuracy
- ISO 7027 conformity
- Infrared turbidity measurement method
- Transmitted and diffused light measurement
- Data Hold
- Max and min storage
- 0 NTU and 100 NTU calibration
- Compact and impact resistant enclosure
- Autom. switch-off (after 5 min.)


SPECIFICATION
Measuring range
0.00 to 50.0 NTU and 50 to 1000 NTU
Resolution
0.01 and 1 NTU
Accuracy
± 5 % from measuring range or ± 0.5 NTU
Light source
LED, infrared at 850 nm
Lifetime
almost unlimited
Light detector
photodiode
Measurement time
< 10 sec.
Battery
6 x 1.5 V AAA batteries
Surrounding conditions
max. 50 °C, max. 85 % rH
Dimensions (H x W x D)
155 x 76 x 62 mm
Weight
320 g

DELIVERY SCOPE
1 x Colorimeter PCE-TUM 20
1 x reference standard 0 NTU
1 x reference standard 100 NTU
2 x measuring cuvettes
1 x cleaning solution
1 x cleaning cloth
6 x batteries 1.5 V AAA
1 x instruction manual
1 x hard case