Keller DCX-25 PVDF Specifications

Autonomous DAtA ColleCtor

for Aggressive meDiA

The DCX-25 PVDF is an autonomous, battery powered instrument designed to record water

depth (pressure) and temperature over long periods. The housing is made of polyvinylidene

uoride and the sensing diaphragm is available in either Hastelloy C-276 or titanium 6AL-4V.

This combination of wetted materials ensures compatibility with even the most aggressive

media.

This data collector (Ø 25 mm) integrates a pressure sensor, electronics and battery in one

housing. The electronics employ the latest microprocessor technology, which give high ac-

curacy and resolution for the pressure and temperature signals. The built-in pressure sensor is

mathematically compensated for all linearity and temperature errors. The use of a non-volatile

memory ensures high data security.

The DCX-25 PVDF works with an absolute pressure sensor. For installation, the data collector

is secured by a suspension cable and immersed into the media to be measured and must be

recovered for data readout. In shallow water, where the inuence of barometric pressure

anges should be considered, it is recommended that a second data logger (e.g. DCX-22 Baro)

placed at the surface to record the barometric pressure. The Logger PC software then calculates

the water depth by subtracting the two measured values. The housing of the data logger can be

opened easily without any tools, thus allowing quick access to the replaceable battery and the

interface connector for conguration and data download.

ch-

DCX-25 PvDf

Interface with a PC is accomplished using one of Keller’s converter cables which are available in

either RS232 connection (K103A) or USB connection (K104A). The necessary converter drivers

are included with converter purchase, along with the Keller Logger software. This intuitive soft-

ware provides the capability to customize the instrument, as needed, for each installation. Users

can congure the DCX-25 PVDF to record at xed time intervals, using xed or event-based

start times, in user-selectable measurement methods to ensure that only the most useful and

meaningful data is collected and stored.

For applications that do not require highest compatibility with aggressive media, Keller offers the

DCX-16, DCX-18, DCX-22 and the DCX-38.

DCX-25 PVDF

Protection cap (Material: Delrin)

Piezoresistive pressure sensor (Material: Hastelloy or titanium)

230 mm

ø 25

Mark of the diaphragm

position of the level sensor

KELLER AG für Druckmesstechnik CH-8404 Winterthur

+41 52 235 25 25 info@keller-druck.com

Electronics- resp.

battery housing

(Material: PVDF)

KELLER Ges. für Druckmesstechnik mbH

D-79798 Jestetten

+49 7745 9214 0 eurocenter@keller-druck.com

KELLER America

Newport News, Virginia

1 877 253 5537 sales@kelleramerica.com

Holder ø 7 mm

Edition 11/2011

Subject to alterations Companies approved to ISO 9001

www.keller-druck.com

SpecificationS

Measuring Range in Meter Water Column 10 mWC 20 mWC 50 mWC 100 mWC

Pressure Ranges in bar abs. 0,8…2,3 0,8…3,0 0,8…6,0 0,8…11,0

Supply Lithium-Battery 3,6 V (Type AA) Battery Life * 10 years @ 1 measurement/hour

Interface RS 485

Electrical Connection Fischer DEE 103A054

Pressure Sensor Specications Linearity typ. 0,02 %FS Error Band (-10…40 °C) typ. 0,05 %FS max. 0,1 %FS Resolution max. 0,0025 %FS Long Term Stability 0,1 %FS/year Overpressure 2 x Pressure Range

Temperature Compensation -10…40 °C (others on request)

Temperature Sensor

Temperature Measurement Accuracy typ. ±0,5 °C via pressure sensor (TOB) optional: add. PT 1000 max. ±0,3 °C

Measuring Channels Pressure / Temperature (TOB) /

Temperature PT 1000 (optional)

Shortest Measuring Range 1x per second Memory 57’000 measuring values @ storage

ring

interval ≤ 15 s, otherwise 28’000 measu-

values (always with attributed time)

(optional: double storage 114’000 / 56’000)

Material

Electronics- / battery housing PVDF = Polyvinylideneuoride

O-Rings Viton

(optional: other materials on request)

Protective Cap Delrin

Sensor Hastelloy C276 or titanium (optional)

Weight: Probe ≈ 200 g (without cable)

* exterior inuences could reduce battery life

LOGGER 4.x

The Logger 4.x software is included with the purchase of an interface cable K103A (RS232) or K104A (USB) and allows users to congure and read data stored on all Keller data loggers (DCX and LEO Record). The software is compatible with Windows (≥Windows 95).

The measuring values may be graphically displayed, exported in different formats, air pressure compensated or converted into other units. The Online-function shows the actual values of the instrument. The Logger 4.x includes the Reader and Writer, as well as the WindowsCE-software for PDA’s.

Writer

The Writer enables the conguration and start of the Logger.

General functions:

- Online display of measuring channels

- Record status indication

- Editing of installation data

- Ring buffer or normal

- Readjustment of the zero

Recording parameter:

- Pressure- and temperature channels selectable

Start methods:

- Time start

- When exceeding or dropping below a certain pressure (or temperature)

- Measuring interval for starting conditions selectable

Recording methods:

- Interval (1s…99 days)

- Combination of xed interval and event recording possible

- Recording at pressure change

- Recording turn on or turn off at pressure threshold

- Averaging over a selectable number of measurements

Reader

The Reader allows the data to be read out onto the PC. The measured data, which can be converted (exported) into various format, also contains

the following information: Serial number, measuring range, sensor name, installation data, read-out data, units, measuring values with date and clock time, read-out date…

General functions:

- Reading of the recordings’ directory with starting time and storage size in %

- Read-out of the individual recordings

- Graphical display of the dat