CLOUD POINT PROCESS ANALYZER

PROCESS ANALYZERS

CLOUD POINT PROCESS ANALYZER Norms and standards • • •

ASTM D-2500 DIN 51597 (old national) IP 219

• •

ISO 3015 (new international) EN 23015

These norms and standards set the operating limits for cloud point measurement for mineral oil products which are clear at a path length of 40 mm (for IP and ASTM 1 ½" = 38 mm) and have a cloud point below 49°C (120°F).

Application The cloud point process analyzer (CPA) is an analyzer for the fully automatic determination of the cloud point (CP) of liquid, transparent mineral oil products. The CPA operates online. It serves to monitor / maintain product quality for the in-spec production of mixtures such as diesel fuel and heating oil.

Measurement principle The product sample is cooled under defined conditions and its turbidity is observed. The temperature at which a cloud of paraffin crystals first appears, is known as the CP. The low- temperature behavior of liquid mineral oil products is very important for their usage, as it affects their ability to be pumped, transported and filtered. The CP is used as an internal process control parameter, or to test standard products offered for sale. The CPA uses a photometric measurement principle. The CP is determined by light scattering (diffuse reflection) caused by finely dispersed colloids which are formed when the product sample in the measuring cell is cooled. The degree of crystallization of the paraffins in the product correlates with the "cold energy" delivered to the sample. The crystals are finely divided particles which scatter and absorb light or other electromagnetic radiation. The scattering depends on the number of particles, the difference in refractive index between the liquid and solids, and the wavelength of the light. The measured CP is the temperature at which a set limit for the scattering is exceeded. The complete analysis procedure is controlled, monitored and visualized by the PACS (Process Analyzer Control System) software. It offers a user interface for local analyzer operation. At the end of the analysis cycle, in addition to the standard analog 4 - 20 mA CP signal, a digital output signal can be generated (programmable). During the analysis, an optional, galvanically separated 4 - 20 mA signal can also be used. As an alternative, a MODBUS interface is available as an option, which also allows a direct control of the anlalyzer from the DCS. In case remote access to the CPA is demanded, it can be equipped with a remote access interface (e.g. Modem, ISDN) for service and maintenance purposes.

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CLOUD POINT PROCESS ANALYZER Cloud Point Process Analyzer Analyzer type

CPA - 4

Method

DIN 3015, ASTM D-2500, IP 219 / 82, DIN ISO 3015

Measurement range

Please specify, ranges on request

Reproducibility

≤ DIN EN / ASTM

Repeatability

≤ DIN EN / ASTM

Measurement cycle

Discontinuous 4-8 min. depending on measuring point

Ambient temperature

5 - 40°C

Ambient humidity

Max. 70%, non - corrosive

Sample at analyzer inlet General conditions

Liquid (≤ 50 cSt), cooled, filtered (≤ 10 µm), dry (humidity max. 2000 ppm)

Flow rate

20 - 40 l/h

Pressure

100 - 300 kPa

Inlet temperature

At least 15°C above expected CP

Outlet / vent

Open to atmosphere

Utilities Cooling water

Clean cold water, temperature depending on measuring point 20 – 60 l/h / 100 – 300 kPa

Power supply

See Specification of purged electronic housing

Instrument air (inlet)

See Specification of purged electronic housing

Electrical signals Ouput signals

1 x 4–20 mA, 800 Ω out; (standard),additional outputs on request

System alarm

Digital output / potential-free

Ready contact

Digital output / potential-free

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CLOUD POINT PROCESS ANALYZER Options Validation request

Digital input

Analyzer reset

Digital input

Input signal

1 x 4–20 mA, 200 Ω in; (galvanically separated)

MODBUS

RS485 / RS422 or fibre optical interface

Remote access interface

Modem (V 90 analog) or ISDN

Closed loop chiller

If no suitable cooling water is available

Chiller alarm

Digital output / potential-free

Communication Display

Colour LC display 800 x 600 pixel

Keyboard

Virtual keyboard, operated via mouse in front door

Software

Windows 2000, PACS software, optional Remote Control Software

Explosion protection Protection type

II 2G EEx - pd II B T4 or optional: II 2 G EEx – pd II B +H2 T4

Test certificates

TÜV 02 ATEX 1846

Standard-connections Tube fittings

6 mm / 12 mm metric SWAGELOK

Cable entries

M20 x 1,5 / M25 x 1,5

Weight

Approx. 250 kg

Dimensions (L x D x H) in mm

1140 x 710 x 1900 (see dimensional drawing)

Important Notice: Analyzer is subject to continuous product improvement, specifications may be subject to change without notice.

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CLOUD POINT PROCESS ANALYZER Specification of the air purged electronic housing System type

PAGS 96-1 (Process Analyzer Housing System)

Version number

96 0200

Protection type

II 2 G EEx p II T4

Test certification number

TÜV 96 ATEX 1132X

EC – identification number

0032

Housing volume

Approx. 200 dm

Dimensions (L x D x H) in mm

515 x 470 x 800

Protection class

IP65 (with a Vortex chiller IP54)

Power supply

To be specified by user

Power consumption

Approx. 2 kW (analyzer approx. 600 W / chiller approx. 1000W)

Maximum power loss

515 W

Ignition prevention gas

Instrument air

3

100 - 150 kPa, constant (for EEx p system) Instrument air (inlet)

300 - 350 kPa, constant (for valves) Humidity class 1 / dew point ≤ - 30°C / oil-free

Housing overpressure

300 - 400 Pa (operating pressure)

Shut down pressure

≤ 80 Pa

Instrument air consumption

Min.1,4 Nm per flushing cycle (7 x housing volume)

3

Important Notice: Analyzer is subject to continuous product improvement, specifications may be subject to change without notice.

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CLOUD POINT PROCESS ANALYZER

Figure 1:

Main panel of process software

Figure 2:

Status of analog and digital In- and Outputs

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CLOUD POINT PROCESS ANALYZER

Figure 3:

Layout drawing of the analyzer (Example; incl. optional sample conditioning system and chiller)

BARTEC BENKE GmbH Borsigstrasse 10 D - 21465 Reinbek / Hamburg Status / 10.07.2003

PROCESS ANALYZERS

Phone +49 (0)40 727 03 - 0 Fax +49 (0)40 727 03 - 228 Internet www.bartec-benke.de Seite 7 / 7