Keller DCX-16 SG, DCX-16, DCX-18 VG, DCX-18 SG, DCX-22 Operating Instructions Manual
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keller-druck.com
November 2013
OPERATING INSTRUCTIONSOPERATING INSTRUCTIONS
DCX DATA LOGGERDCX DATA LOGGER
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Table of contents
Product overview 3
Overview of structural designs, Series DCX 4
Measuring principle for Series DCX 5
General
Level measurement
Relative pressure measurement (VG)
Absolute pressure measurement (SG)
Absolute/absolute pressure measurement (A/A)
Level measurements in closed receptacles
Functionality of the Series DCX data logger 8
Data memory
Installation instructions 9
Important information
Guidelines on safe and efcient use
Warranty conditions
Data for repair and replacement
Disposal of old electrical equipment and batteries / rechargeable batteries
Fitting instructions 11
Requirements for the location
Installation in level tubes
Water level conguration
Installation of relative data logger (-VG versions)
Conguring and reading the DCX
DCX time
Verifying measured data
Device memory
Maintenance 16
Battery
Changing the battery, Series DCX
Watertightness
Rechargeable battery
Ventilation diaphragm
Moisture absorber cartridge
Cleaning 19
Cleaning the level sensor
Cleaning the air pressure sensor (-AA versions)
Calibration 20
Setting the zero point
Testing by the manufacturer
Level measurement with pressure sensors 20
Overview of DCX 22
Accessories 26
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Product overview
The data loggers in Series DCX are autonomous, battery-powered data collectors
which can measure the water level (water column, i.e. pressure) and temperature over
lengthy periods.
Series DCX is designed for level measurements and is generally used for long-term
data acquisition in applications with brackish water, salt water or fresh water.
Series DCX is also available with a connecting thread for process applications.
Various versions are available in Series DCX. The standard material is stainless steel,
316L (DIN 1.4435). For added resistance to media, the logger can be manufactured to
order from Hastelloy or titanium as options. The key distinguishing features of products in
Series DCX are their measuring methods and the diameter of the probe.
Designation
Measuring
principle
Max.
pressure range
Max. mH2O
Max. cable length**
DCX-16 absolute 0,8…11 bar abs.
0…100 mH2O
–
DCX-16 VG relative 0…10 bar rel.
0…100 mH2O
500 meters
DCX-16 SG absolute 0,8…11 bar abs.
0…100 mH2O
500 meters
DCX-18 absolute 0,8…11 bar abs.
0…100 mH2O
–
DCX-18 VG relative 0…10 bar rel.
0…100 mH2O
500 meters
DCX-18 SG absolute 0,8…11 bar abs.
0…100 mH2O
500 meters
DCX-22 absolute 0,8…11 bar abs.
0…100 mH2O
–
DCX-22 Baro absolute 0,8…1.3 bar abs.
0…100 mH2O
–
DCX-22 VG relative 0…10 bar rel.
0…100 mH2O
500 meters
DCX-22 SG absolute 0,8…11 bar abs.
0…100 mH2O
500 meters
DCX-22 AA
absolute/absolute
0,8…11 bar abs.
0…100 mH2O
80 meters
DCX-25 PVDF absolute 0,8…11 bar abs.
0…100 mH2O
–
DCX-38 VG relative 0…
300 mbar rel. 0…3 mH2O
500 meters
DCX-22 AA
Probe diameter
16 = Ø 16 mm
18 = Ø 18 mm
22 = Ø 22 mm
25 = Ø 25 mm
38 = Ø 38 mm
Version
.... Absolute pressure measurement / without cable
VG Relative pressure measurement / with cable
SG Absolute pressure measurement / with cable
AA Absolute pressure measurement with 2 sensors / with cable
PVDF For use in aggressive media.
Special housing made of polyvinylidene uoride (PVDF) with high
resistance to chemicals / Available for probe diameter of 25 mm,
without cable only
** For other system lengths, please contact our sales staff
Maximum pressure ranges and cable lengths
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Overview of structural designs, Series DCX
-VG -SG
-VG -SG
-VG -SG -AA
Different versions of the autonomous data loggers in Series DCX are available from
KELLER in order to meet the requirements for the measuring point, the on-site environ-
mental conditions and the uid to be measured:
Series DCX-16
- probe diameter 16 mm
Series DCX-18
- probe diameter 18 mm
- powered by rechargeable battery
- completely welded in
- screw-on cable
Series DCX-22
- probe diameter 22 mm
- AA version
- high-accuracy version
- customized versions
on request
Series DCX-25 PVDF
- probe diameter 25 mm
- for use in aggressive media
Special housing made of polyvinylidene uoride (PVDF)
with high resistance to chemicals. Pressure sensor in
Hastelloy or titanium, according to choice
Series DCX-38 VG
- probe diameter 38 mm
- to measure low pressures or
levels (measuring ranges: 0,5 / 1 / 3 mWS)
- capacitive measuring cell with gold-plated
ceramic diaphragm
- Moisture absorber cartridge included in scope of delivery
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Measuring principle for Series DCX
DCX-
①
Cable
Cable with integrated
capillary tube
Surface of
water
① ① ①
②
③
-AA version -VG version -SG version
①Level sensor
P1 = medium pressure [bar]
TOB1 = medium temperature [°C]
②Air pressure sensor
P2 = air pressure [bar]
TOB2 = air temperature [°C]
③Reference aperture
For physical compensation
of the ambient pressure (air pressure)
optional
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General information
Fluctuations in the groundwater level (or the levels of other uids) can be determined
and located precisely by measuring the prevailing (hydrostatic) pressure at a dened
depth below the surface of the water. To convert the pressure [bar] into the water
column level [mWS], it is only necessary to know the density of the uid.
Example pure water (H2O): 100 mbar ≈ 1,02 mWS
p = hydrostatic pressure (0,1 bar = 10,000 N/m2)
ρ = density (kg/m3)
g = gravitational acceleration (m/s2)
h = height of water column (m)
Level measurement
In open systems, i.e. with the classical method of measuring
the lling level, the difference between the pressure acting
on the level sensor (total pressure) and the ambient pressure
acting on the water (air/atmospheric pressure in most cases) is
always measured. The pressure difference determined in this
way corresponds to the hydrostatic water pressure.
As a result of this measurement method, the level measurement becomes independent
of weather-induced uctuations in air pressure that act on the surface of the uid. The
following methods of compensating for air pressure are available:
Relative measurement method (VG)
In the relative measurement method, the sensor cable has an integrated capillary tube
which provides the reference to the ambient air pressure directly on the level sensor.
The sensor pressure measured in this way is therefore physically compensated for air
pressure.
Advantage: high accuracy and resolution
Disadvantage: high ambient humidity at the measuring point may disrupt or interrupt
compensation for air pressure and, in extreme cases, may even damage
the level sensor (→ use moisture absorber cartridges)
Ambient pressure (Air pressure)
Hydrostatic pressure
of the water
Total pressure
h =
p = N/m2 =
mWS
ρ
*
g kg/m3 *
m/s
2
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Absolute measurement method (SG)
With the absolute measurement method, the prevailing total pressure on the level sen-
sor is determined (= air pressure + hydrostatic water pressure). To compensate for
the inuence of uctuations in air pressure, a second data logger is positioned on the
surface as a barometer.
Advantage: very robust, impervious to ambient humidity
Disadvantage: no integrated air pressure compensation
Absolute/absolute measurement method (A/A)
Total pressure and air pressure are each determined by means of a pressure sensor
(A/A technology) and are calculated mathematically in the device by subtracting the two
measured values. A sensor cable without a capillary tube is used for this measurement
method, and this is why AA systems are highly resistant to the ambient humidity prevailing at the measuring point.
Advantage: very robust, impervious to humidity or ooding
Disadvantage: slight reduction in measurement accuracy because of measurements
by two sensors
Level measurements in closed receptacles
For level measurement in closed receptacles/vessels,
the internal pressure in the vessel is measured instead of
the air pressure. The A/A measurement method is usually
selected on account of the humidity prevailing inside the
vessel.
Air pressure
Internal
pressure
Water
pressure
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Functionality of Series DCX
Autonomous data loggers in Series DCX record the values measured for pressure and
temperature together with the time of each measurement.
The following types of recording and initial conditions are supported:
Recording interval Constant
storage interval
Interval ≥ 1 second
Event-controlled
recording
If value is exceeded
If value is undercut
If value changes
Initial conditions Directly after programming is completed
Specied, user-dened time
Recording starts when a value has been undercut
Recording starts when a value has been exceeded
→ Constant storage interval and event-controlled recording can be used simultaneously
Data memory
The following table gives an overview of recording periods for various constant
measurement intervals. (Data memory size: 2 Mbit)
Type Interval Number of
channels
Measurement channel Recording period
DCX-22 1 sec 1 Total pressure > 15 h 54 min
DCX-22 1 min 1 Total pressure > 21 h 7 h
DCX-22 1 h 1 Total pressure > 3 y 6 m
DCX-22 1 sec 2
Total pressure and medium temperature
> 7 h 57 min
DCX-22 1 min 2
Total pressure and medium temperature
> 14 d 4 h
DCX-22 1 h 2
Total pressure and medium temperature
> 2 y 4 m
DCX-22 1 d 2
Total pressure and medium temperature
> 56 y 9 m
DCX-22AA 1 sec 5 Air pressure and air temperature,
total pressure and medium tempera-
ture, calculated water column level
> 3 h 10 min
DCX-22AA 1 min 5 Air pressure and air temperature,
total pressure and medium tempera-
ture, calculated water column level
> 7 d 2 h
DCX-22AA 1 h 5 Air pressure and air temperature,
total pressure and medium tempera-
ture, calculated water column level
> 1 y 2 m
DCX-22AA 1 d 5 Air pressure and air temperature,
total pressure and medium tempera-
ture, calculated water column level
> 28 y 4 m
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Installation instructions
Important information
KELLER website
At www.keller-druck.com, you will nd a software section where you can download
all KELLER’s software programs free of charge. The site contains the latest software
versions together with datasheets and operating instructions for the corresponding
products.
Service and Support
For service and support, please contact your local dealer or contact us at www.kellerdruck.com
Guidelines on safe and efcient use
• Treat the product with care and keep it in a clean place that is free of dust.
• This product must only be used within the specied temperature range
(→Product datasheet)
• Do not drop or throw the device
• Do not attempt to modify the device
• The sensor pressure diaphragm is sensitive to contact. Do not press the diaphragm in
by hand or damage it with sharp objects. Do not direct water jets at the diaphragm.
• Only use this device for non-ammable uids with no explosion hazard. KELLER
offers a series of measurement equipment products suitable for use in areas with
explosion hazards (ATEX zones). For more information, please contact our sales
staff.
•
Aggressive media may damage the product. Make sure that the materials in the product
are not attacked by the medium to be measured.
• With relative versions (VG), the end of the cable must be located in a dry environment
in order to prevent condensation forming. If the cable ends in a humid environment, it
is highly advisable to use moisture absorber cartridges.
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• The level measurement sensor must not freeze up in the medium
• Do not glue, block or contaminate any ventilation components as this will substantially
impair measurement accuracy.
• Fasten/secure the product so that the logger cannot fall into the measuring point in
case of a handling error.
Warranty conditions
The warranty does not apply to faults on the device caused by normal wear, incorrect
use or misuse, or failure to comply with KELLER’s instructions.
Data security
KELLER assumes no responsibility for data loss of any nature, and shall not pay com-
pensatory damages in case of data loss. Data stored in the product may be lost if the
product is repaired or replaced. You should always create a backup of all data stored in
the product before releasing it for repair or replacement.
Disposal of old electrical equipment and batteries / rechargeable batteries
To prevent possible damage to the environment or to health due to uncontrolled waste
disposal, this product must be separated from other waste and recycled correctly in
order to ensure sustainable use of the raw materials. Remove rechargeable
batteries that have been installed permanently. Permanently installed rechargeable batteries must be removed only by a waste processing facility or a trained service technician.
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