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Operating instructions
Groundwater datalogger
OTT CTD
English
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These operating instructions (version "01-1009") cover the OTT CTD software
versions
OTT CTD firmware from V 1.00.0
OTT CTD operating program from V 1.50.0
The OTT CTD firmware version can be found in the "Advanced operation" mode,
"OTT CTD" window of the operating program. The version of the operating
program can be found via the "Info" function in the "Help" menu.
We reserve the right to make technical changes and improvements without notice.
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Table of contents
1 Scope of supply 4
2 Order numbers 4
3 Safety information 5
4 Introduction 6
5 Installing, checking, and exchanging batteries 8
6 Installing the OTT CTD 10
6.1 Installing in 1" observation wells 12
6.2 Installing in 2", 3", 4", 5" or 6" observation wells,
top cap with adapter plate recess 13
6.3 Installing in observation wells beginning at 2" diameter,
top cap without adapter plate recess 15
6.4 Installing in observation wells beginning at 2" diameter without a top cap 17
7 Setting OTT CTD operating parameters 18
7.1 Installing the OTT CTD operating program 18
7.2 Establishing a communication link from PC to OTT CTD 18
7.3 Setting OTT CTD operating parameters 20
7.4 Saving/loading OTT CTD configuration 24
7.5 Importing/exporting OTT CTD configuration 24
8 Determining and displaying instantaneous values (observer function) 26
9 Reading out data 28
10 Exporting data 29
11 Displaying data 30
12 Protecting the OTT CTD and OTT CTD operating program with a password 31
13 Date and time settings 33
14 Deleting the data memory 34
15 Installing new OTT CTD firmware 34
16 Maintenance work 35
16.1 Cleaning the pressure probe 35
16.2 Replacing the desiccant capsules 36
16.3 Checking/replacing the batteries 36
16.4 Calibrating the conductivity sensor 36
17 Error messages 38
18 Troubleshooting/fault correction 38
19 Repair 40
20 Notes about the disposal of old units 40
21 Technical data 41
Appendix A – Declaration of conformity for OTT CTD 43
3
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1 Scope of supply
OTT CTD – 1 groundwater datalogger consisting of a communication unit with installed
O-ring, pressure probe cable with pressure compensation capillary and
Kevlar core for longitudinal stabilization, 2 desiccant capsules, pressure probe
with integrated conductivity sensor and datalogger
– 3 x 1.5 V batteries, alkaline (LR6 · AA) or lithium design (FR6 · AA)
– 1 brief Instructions
– 1 factory acceptance test certificate (FAT)
2 Order numbers
OTT CTD Groundwater datalogger 55.445.001.9.0
Information needed for order
– Measuring range:0 … 4 m;
0 … 10 m;
0 … 20 m;
0 … 40 m;
0 … 100 m
– System length: 1,5 … 200 m (±1 % ±5 cm)
– Battery type: alkaline, lithium
Accessories Installation kit 55.440.025.9.2
consisting of: adapter ring 1", adapter
plates 2", 4", 6", suspension bracket
Adapter plates 3" and 5" 55.440.444.4.1
Suspension brackets 55.440.450.4.1
for top caps starting at 2" without recess
and for universal installation
Cable suspension unit on request
for OTT CTD system lengths of > 100 m
CD-ROM „OTT CTD Software“ 56.571.000.9.7
OTT CTD operating program for PC
Top cap
with integrated fastening hook
– for 2" observation wells 24.220.052.9.5
– for 4" observation wells 24.220.054.9.5
– for 6" observation wells 24.220.057.9.5
Intelligent top cap OTT ITC 55.530.0xx.3.2
for GSM remote data transfer
5-sided key 20.250.095.4.1
to lock OTT top caps
Optical OTT Duolink reading head 55.520.017.4.2
Optical OTT IrDA link USB reading head 55.520.026.9.2
Calibration container 55.445.025.9.2
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Alkaline battery 96.800.004.9.5
LR6 · AA; 3 units required
Lithium battery 97.800.008.9.5
FR6 · AA; 3 units required
Desiccant capsules 97.100.280.9.5
2 in aluminum bags
Conductivity calibration solution
– 0,1 mS/cm; 1000 ml 55.495.350.9.5
– 0,5 mS/cm; 946 ml 55.495.351.9.5
– 1,412 mS/cm; 1000 ml 55.495.352.9.5
–12,856 mS/cm; 946 ml 55.495.353.9.5
– 47,6 mS/cm; 1000 ml 55.495.354.9.5
3 Basic safety information
Read these operating instructions before using the OTT CTD for the first time!
Become completely familiar with the installation and operation of the OTT CTD
and its accessories! Retain these operating instructions for later reference.
The OTT CTD is used to measure groundwater levels, the water temperature
and the specific conductivity of the groundwater. Only use the OTT CTD as
described in these operating instructions!
For further information, ➝ see Chapter 4, "Introduction".
Note all the detailed safety information given within the individual work steps.
All safety information in these operating instructions are identified with the
warning symbol shown here.
Ensure the electrical, mechanical, and climatic specifications listed in the
technical data are adhered to.
For further information ➝ see Chapter 11, "Technical data".
Handle the pressure probe cable carefully: Do not kink the cable or pull it
across sharp edges!
Do not make any changes or retrofits to the OTT CTD. If changes or retrofits
are made, all guarantee claims are voided.
Have a faulty OTT CTD inspected and repaired by our repair center. On no
account carry out repairs yourself!
For further information ➝ see Chapter 19, "Repair".
Dispose of the OTT CTD properly after taking out of service. On no account put
the OTT CTD into the normal household waste.
For further information ➝ see Chapter 20, "Notes about the disposal of old units".
Replacement
parts/
Consumable
materials
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4 Introduction
The OTT CTD groundwater datalogger provides precise measurement and recording of groundwater levels and temperatures, as well as the specific electrical
conductivity of the groundwater. The OTT CTD also calculates the salinity and a
TDS value (Total Dissolved Solids) based on the specific conductivity.
The pressure probe uses the hydrostatic pressure of the water column above a
relative pressure measuring cell to determine the water level. A pressure compensation capillary in the pressure probe cable gives the measuring cell the current
ambient air pressure as a reference. Erroneous measurement results due to atmospheric air pressure fluctuations are thus eliminated. The OTT CTD measures the
specific electrical conductivity using a 4-electrode conductivity sensor with inte grated temperature sensor. The measurement electrodes are made of graphite.
The temperature compensation process for the conductivity measurement and the
reference temperature used can be chosen as well as the calculation method for
the salinity.
The OTT CTD is available with five water level measuring ranges:
0 … 4 m water column (0 ... 0.4 bar)
0 … 10 m water column (0 ... 1 bar)
0 … 20 m water column (0 ... 2 bar)
0 … 40 m water column (0 ... 4 bar)
0 … 100 m water column (0 ... 10 bar)
With the help of a reference value that is input during startup, the OTT CTD’s
standard setting provides measurement results in the form of depth values. Alternatively, measured values can be levels or pressures. The measurement intervals
(sample intervals) can be preselected as necessary.
The operating parameters are adjusted with the "OTT CTD Operating program"
PC software. This software allows the system to be conveniently and flexibly
tailored to a wide range of measurement requirements. The software can be set
to provide a basic or an advanced operator interface. The basic operator interface allows all settings to be adjusted within a single program window. In the
advanced operator interface, the sample interval can be controlled with limit
events, for example. The software also supports the execution of pump tests.
The stored measured values are made available through an infrared interface
(IrDA) for wireless readout by a PC with OTT CTD Operating program or OTT
Hydras 3 or by a PDA with OTT Hydras 3 Pocket.
Together with an OTT ITC intelligent top cap (accessory), remote data transfer
and remote parameter input is possible via the GSM mobile telephone network
(GSM = global system for mobile communications). The remote data transfer can
be optionally carried out by SMS text messages or using the packet oriented
mobile radio transmission service GPRS (general packet radio service).
The OTT CTD is installed simply by hanging it in observation wells of 1" in diameter and larger. Various adapters/suspension brackets are available as accessories
for this purpose. Three 1.5 V lithium batteries (type AA) provide an operating life
of over five years (sample interval: 1 hour; system length: 50 m). Alternatively,
alkaline batteries with a limited working life can be used.
The communication unit of the OTT CTD can withstand temporary flooding (for
details, see chapter 21, "Technical data").
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Top cap
Observation well
Communication unit
Pressure probe cable
Rubber stop
Pressure probe with
datalogger unit
Conductivity sensor
Pressure Sensor
DepthMeasuring range
Measuring range:
0 … 4 m, 0 … 10 m, 0 … 20 m,
0 … 40 m, 0 … 100 m water column
System length
Fig. 1: Setting up a groundwater measure-
ment station with the OTT CTD.
The OTT CTD essentially consists of three com-
ponents: Communication unit, pressure probe
cable and pressure probe with datalogger.
OTT CTD system length = length of
communication unit + cable length +
length of pressure probe with datalogger.
(The system length is required when
ordering an OTT CTD. When setting
the OTT CTD operating parameters the
system length is not required.)
(The rubber stop attached to the pressure
probe cable prevents the pipe casing from
falling when the communication unit is
open. Do not move the rubber stop!)
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5 Installing, checking, and exchanging batteries
Please note
Only use the battery types indicated (no rechargeable batteries)!
Always use brand new batteries! Do not mix used and new batteries!
Do not mix batteries of different manufacturers!
Do not mix lithium and alkaline batteries!
Properly dispose of dead batteries! Do not include in household waste!
Suitable battery types
3 x 1.5 V AA cells (LR6/FR6),
alkaline or lithium design (LiFeS; Energizer L91)
Insert the batteries as follows
Slide the pipe casing of the communication unit approximately 30 cm in the
direction of the pressure probe cable.
Insert 3 batteries (LR6/FR6 · AA) in the battery compartment
as shown in Figure 2. Ensure that the polarity is correct!
Screw the pipe casing of the communication unit back on.
Notes
The OTT CTD begins measurements within a few seconds of the batteries being
inserted (there is no on/off switch).
If the OTT CTD is to be shut off ➝ remove the batteries. This will prevent the
batteries from draining prematurely and will stop any recording of unusable
measurements.
When bringing back into operation it takes – dependent on how much data is
stored – up to 7 minutes until the OTT CTD begins measurements again.
Pipe casing
communication
unit
Battery compartment
LR6/FR6 · AA
Battery
Backstop
+
+
+
Fig. 2: Installing batteries.
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Battery life
For a 1 hour sample interval an 50 m system length (without ITC).
Lithium batteries: at least 5 years
Alkaline batteries: at least 1.5 years (high quality battery types)
Notes
The operating program has a calculation function that determines the approximate battery life based on the operating parameters currently set. The basis for
this are lithium batteries!
Due to their design, at 0 °C, alkaline batteries drop to 50 % of their original
20 °C capacity and at –10 °C they drop to approximately 35 %. If ambient
temperatures are expected to drop below 0 °C at the measurement station, it
is recommended that lithium batteries be used.
Check the battery voltage as follows
Set up the PC/OTT CTD communication link (see Chapter 7.2).
Select the "OTT CTD" menu, "View Instantaneous values" function
1)
➝ the
OTT CTD starts an instantaneous value measurement ➝ the "Observer"
window indicates the current battery voltage and the energy withdrawn from
the batteries so far in Ah.
If the battery voltage is ≤ 3.6 to 3.7 volts ➝ replace the batteries.
Click on the "Exit" button.
Close the operating program.
1)
With suitable settings (Menu "File", Function "Options"), the operating program starts with the
"Observer" window.
Replace dead batteries as follows
Open the top cap/observation well cover.
Pull the communication unit approximately 80 cm out of the observation well
and hold (a second person would be useful).
Slide the pipe casing of the communication unit approximately 30 cm in the
direction of the pressure probe cable. (The rubber stop located on the pressure
probe cable (see Fig. 1) prevents the pipe casing from falling. Do not move the
rubber stop!)
Remove dead batteries.
Insert 3 new batteries (LR6/FR6 · AA) into the battery compartment as shown
in Figure 2 within 10 minutes. Ensure that the polarity is correct!
Slide the pipe casing of the communication unit back on until it stops.
Slowly and carefully place the communication unit back into the observation well.
Close the top cap/observation well cover.
Notes
The OTT CTD stores the measured values in a non-volatile memory. This prevents any data loss when replacing the batteries. This also applies to storage
over a long time period with the batteries removed.
If it takes longer than approx. 10 minutes to replace dead batteries, the time
(and possibly the date) will have to be re-entered (see Chapter 13, "Date and
time settings"). Furthermore, it takes – dependent on how much data is stored –
up to 7 minutes until the OTT CTD begins measurements again.
When replacing the batteries, we recommend changing the desiccant capsules
at the same time (see Chapter 16.2, "Replacing the desiccant capsules").
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6 Installing the OTT CTD
System length up to 100 meters
The installation of the OTT CTD is carried out by suspending it in the observation well.
In the process, the necessary accessories and type of installation varies depending
on the diameter of the observation well and the design of the top cap:
1" observation wells see 6.1
2", 3", 4", 5" or 6" observation wells, see 6.2
OTT top caps with recess for adapter plate
Observation wells beginning at 2" in diameter, see 6.3
top caps without recess for adapter plate
Special case: Observation wells beginning at see 6.4
2" in diameter without top cap
System length over 100 meters
For installation of an OTT CTD with a system length of more than 100 meters,
there is a special cable suspension unit available (see accessories). This suspension
unit is described separately.
Adapter plate 2"
Adapter plate 4"
Adapter plate 6"
2
3
33
3 2/3
3
1
1
2
1
Fig. 3: Installation accessory set – Part 1.
1 = hole for OTT CTD
2 = hole for contact gauge
3 = recess for screws on the top cap
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Adapter plate 3"
Adapter plate 5"
33
33
1
1
2
2
Fig. 5: Adapter plate accessories 3" and 5".
1 = hole for OTT CTD
2 = hole for contact gauge
3 = recess for screws on the top cap
Suspension bracket
Adapter ring 1"
Fig. 4: Installation accessory set – Part 2.
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6.1 Installing in 1" observation wells
Required accessories: Adapter ring for 1" observation wells.
Install the OTT CTD as follows
Preliminary work: If not already done, install batteries (see Chapter 5).
Open the observation well cover.
Determine the current depth with a contact gauge and make a note of it.
Slide O-ring from the communication unit onto the pressure probe cable.
Place adapter ring over the pressure probe cable and slide it until it comes
to rest against the communication unit.
Slide O-ring back onto the communication unit.
Place the pressure probe in the observation well.
Slowly and carefully lower the pressure probe with the pressure probe
cable!
Feed the communication unit into the observation well until the O-ring sits on
the obser
vation well (see Figure 6).
Raise and lower the pressure probe in quick succession approx. 30 cm ➝ this
removes any air bubbles in the conductivity sensor.
Set operating parameters (see Chapter 7).
Close the observation well cover carefully. Caution: Do not damage the
infra-red interface (maintain correct spacing)!
Adapter ring 1"
O-ring
Communication unit
Observation well cover
(example)
Infrared interface
1" Observation well
Fig. 6: Installing the OTT CTD
in 1" observation well.
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6.2 Installing in 2", 3", 4", 5" or 6" observation wells,
top cap with adapter plate recess
Required accessories: OTT top cap with appropriate sized recess and the
matching adapter plate.
Install the OTT CTD as follows
Preliminary work: If not already done, install batteries (see Chapter 5).
Open the top cap cover.
Insert correctly sized adapter plate into top cap.
Pass pressure probe through the hole in the adapter plate.
Slowly and carefully lower the pressure probe into the obser
vation well
with the pressure probe cable (see Fig. 8)!
Raise and lower the pressure probe in quick succession approx. 30 cm ➝ this
removes any air bubbles in the conductivity sensor.
Pass the communication unit through the hole in the adapter plate until the
O-ring sits on the adapter plate (see Fig. 7).
Deter
mine the current depth with a contact gauge and make a note of it.
Set operating parameters (see Chapter 7).
Close the top cap.
Adapter plate 2"
Communication
unit
Recess
O-ring
OTT Top cap
Fig. 7: Installing the OTT CTD in 2",
3", 4", 5" or 6" observation wells.
Example: 2" observation well
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Recess
Top cap
Communication unit
O-ring
Adapter plate
Fig. 8: Installing the OTT CTD.
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6.3 Installing in observation wells beginning at 2" in diameter,
top cap without adapter plate recess
Required accessories: Top cap with attachment screw for the top of the top cap.
Suspension bracket.
Caution: There must be sufficient space in the top cap for the infrared interface
to not be damaged when the top of the top cap is closed!
Install the OTT CTD as follows
Preliminary work: If not already done, install batteries (see Chapter 5).
Open the top cap cover.
Remove the upper part of the top cap (see Fig. 9).
Place the suspension bracket on the screw (see Fig. 9).
Reattach the upper part of the top cap (see Fig. 9).
Pass the pressure probe through the holes in the suspension bracket.
Slowly and carefully lower the pressure probe into the obser
vation well
with the pressure probe cable!
Raise and lower the pressure probe in quick succession approx. 30 cm ➝ this
removes any air bubbles in the conductivity sensor.
Pass the communication unit through the holes in the suspension bracket until
the O-ring sits on the suspension bracket (see Fig. 10).
Determine the current depth with a contact gauge and make a note of it.
Set operating parameters (see Chapter 7).
Close the top cap.
Suspension
bracket
Screw
Top cap
upper part
Fig. 9: Installing the suspension bracket in
observation wells beginning at 2" diameter
with a top cap without a recess.
Example: 4" observation well
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Caution: For top caps with installed suspension brackets, never completely
remove the screw in the top cap! Otherwise, the suspension bracket and the
OTT CTD will fall into the observation well!
O-ring
Suspension
bracket
Communication
unit
Top cap
upper part
Screw
Infrared
interface
Fig. 10: Installing the OTT CTD in obser-
vation wells beginning at 2" diameter
with a top cap without a recess.
Example: 2" observation well
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6.4 Installing in observation wells beginning at 2" diameter
without a top cap
For this installation case, an individual solution to fasten the OTT CTD must be
found depending on the measurement station. Example: fix a suspension bracket
with an M6 hex bolt/nut laterally at the upper end of the observation well.
Required accessories: Suspension bracket; for example: M6 hex bolt, plate
and M6 hex nut.
Install the OTT CTD as follows (example)
Preliminary Work: If not already done, install batteries (see Chapter 5).
Make a hole (Ø 6.5 mm) laterally at the upper end of the observation well.
Attach the suspension bracket with an M6 hex bolt and M6 hex nut (both
stainless steel) to the obser
vation well (see Fig. 11).
Pass the pressure probe through the holes in the suspension bracket.
Slowly and carefully lower the pressure probe into the observation well
with the pressure probe cable!
Raise and lower the pressure probe in quick succession approx. 30 cm ➝ this
removes any air bubbles in the conductivity sensor.
Pass the communication unit through the holes in the suspension bracket until
the O-ring sits on the suspension bracket (see Fig. 10).
Deter
mine the current depth with a contact gauge and make a note of it.
Set operating parameters (see Chapter 7).
Suspension
bracket
Hex nut
Plate
Hexagon bolt
Observation
well
Fig. 11: Example installation of an
OTT CTD in an observation well
beginning at 2" diameter.
Proceed similarly for
other local conditions!
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7 Setting OTT CTD operating parameters
To set the OTT CTD operating parameters you need the PC software "OTT CTD
Operating program" (WBSPL0.exe). This software is contained on the "OTT CTD
Software" CD-ROM (accessory).
Hardware and software requirements: see CD insert.
7.1 Installing the OTT CTD operating program
Install the OTT CTD operating program as follows
Insert the OTT CTD Software CD-ROM into the drive of the PC.
Start the "setup.exe" file in the "\Software\Deutsch"
1)
directory (e.g. double
click on the file symbol) ➝ the Setup Assistant opens and guides you through
the installation.
Follow the installation instructions on the screen.
1)
Alternatively: "\English" or "\Français" or "\Español"
7.2 Establishing a communication link from PC to OTT CTD
In the following chapters, establishing a communication connection between the
OTT CTD and a PC is a pre-requisite for the subsequent steps. The following
description illustrates the various methods of setting up this communication link.
The communication between the OTT CTD and a PC is established without contact
via invisible infrared light (IrDA interface).
Required accessories:
OTT Duolink reading head
1)
or
OTT IrDA-Link USB reading head
1)
with PCB version "b": see label on the connection line
Note
Together with a modem and the OTT ITC intelligent top cap, it is possible to
establish a remote communication connection. See online help.
How to establish a communication link
Start the OTT CTD operating program.
Change the language for the OTT CTD operating program as required:
Press function key "F3" (multiple times) until the required language appears.
In the start window, press the "Setup device" button ➝ the operating program
displays the "Basic operation" window
. No operating parameters for the
OTT CTD are visible yet.
– Setting up a communication link with the OTT Duolink reading head:
Connect the OTT Duolink reading head to a serial PC interface (COM1, etc.).
Place the OTT DuoLink reading head on the OTT CTD infrared inter
face
(see Fig. 12).
In the OTT CTD operating program, select the communication path "IrDA –
OTT DuoLink" and the serial inter
face used (COM1, etc.).
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– Setting up a communication link with the OTT IrDA-Link USB reading head:
Connect the OTT IrDA-Link USB reading head to a USB interface on the PC.
(USB interface drivers must be installed, see separate installation instructions.)
Place the OTT IrDA-Link USB reading head on the OTT CTD infrared interface
(see Fig. 12).
Select the communication path "IrDA – OTT IrDA-Link" in the operating
program.
Notes
The integrated infrared interface of a PC (standard for many notebooks) can
only be used with the Windows 95 and Windows NT operating systems!
The OTT CTD infrared interface has a radiation angle of approx. ±15 °.
Caution: OTT CTD connected to OTT ITC: Establishing a communication
connection can take up to a minute! (This is always the case if the OTT CTD
attempts to communicate with the OTT ITC (e.g. SMS message) and the OTT ITC
is open at the time.)
Fig. 12: Establishing a communication
link PC/OTT CTD.
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7.3 Setting OTT CTD operating parameters
How to set the OTT CTD operating parameters
Click the "Read" button (alternatively: Menu "OTT CTD", function
"Read") ➝ the operating program reads the current operating parameters of
the OTT CTD.
Adjusting operating parameters (see overview on page 21).
If necessary: „Set up cyclical data transfer with SMS text message in combi -
nation with an OTT ITC intelligent top cap“ or „Set up cyclical data transfer
using GPRS in combination with an OTT ITC intelligent top cap“ –
see below.
Set time: adjust the proposed PC date/time or individually set date/time using
"Set date/time" (see also Chapter 13).
Caution: The operating program automatically corrects any summer time PC
adjustments.
Click the "Program" button➝ "W
arning: Reset the OTT CTD and delete data
memor
y additionally?" Confirm with "Y
es" (recommended for initial installation
and reinstallations).
Caution: All measured values collected until now will be permanently lost!
Check the level of the adjusted measured value (pressure sensor). See Chapter 8.
Remove OTT DuoLink.
Close the top cap/observation well cover.
If necessar
y: Set up cyclical data transfer with SMS text message
in combination with an OTT ITC intelligent top cap
1)
Activate check box "Modem/ITC connected".
Activate check box "SMS data transmission active".
Click on the "ITC settings" button ➝ the operating program starts an Assistant
for setting all the necessary operating parameters.
Enter the receiver phone no. for the data SMS. (phone number of a large
account or for a PC with GSM modem.)
Click on the "Next" button.
Enter SIM PIN (4-digit) of the SIM card.
Click on the "Next" button.
Set or enter the SMS-C phone no. of the network operator. (Phone number of
the SMS ser
vice center. The SMS-C phone number is normally already saved
on the SIM card ➝ in this case, set to "SIM card".)
Click on the "Next" button.
Select the SMS transfer mode.
Click on the "Next" button.
Set the inter
val for transmission of the storage values.
Click on the "Next" button.
Set the offset time for the transmission interval.
Click on the "Exit" button.
Check the settings afterwards and correct as necessary.
Click on the "OK" button.
If necessar
y: Set up cyclical data transfer using GPRS in com -
bination with an OTT ITC intelligent top cap
1)
Activate check box "Modem/ITC connected".
Activate check box "GPRS data transmission active".
Click on the "ITC settings" button ➝ the operating program opens a window
with several tabs for setting all the necessary operating parameters.
Make the required settings in the "General", "Operator", "FTP" and "Time
sync." tabs. Caution: The SIM PIN for the SIM card used should be deactivated!
Otherwise enter the SIM PIN in the "Modem/ITC" tab (advanced operation
mode).
Click on the "OK" button.
1)
For further information, refer to the online help
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OTT CTD
Number Station number, 10 characters (alphanumeric)
Name Station name, max. 40 characters (alphanumeric)
Water level / Pressure + Temperature + Conductivity
Number Sensor number, 4 characters (alphanumeric)
Name Sensor name, max. 40 characters (alphanumeric)
– Water level: Depth or level pressure
– Conductivity
0.001 … 2.000 mS/cm · 0.10 … 100.00 mS/cm
– Salinity: 2 … 42.00 PSU · 2 … 60.00 ppt
Units – Pressure sensor: m, cm, feet, inch / bar, psi
– Temperature: °C · °F
– Conductivity: mS/cm · μS/cm
– Salinity: PSU · ppt
– TDS: mg/l
Decimal places fixed specification, depending on the units and measuring range
– m: 3 or 2; cm: 1 or 0; feet: 2 or 1, inch: 1 or 0
– bar: 4 or 3, psi: 3 or 2
– °C: 2 or 1, °F: 2 or 1
for the depth output type: input contact gauge value
for the level output type: enter staff gauge value (generate reference to the level zero)
for the pressure output type: input reference pressure
Sample interval 5 s … 24 h; time delay at which the OTT CTD records measured values and stores them
(store only if sample interval = mean interval). The sample interval setting is at a fixed
time raster (e.g. sample interval of 10 minutes, time raster …, 00:10, 00:20, 00:30, …).
Storage interval 5 s … 24 h; time delay during which the OTT CTD calculates an arithmetic mean from
the sample interval values and stores it. The storage interval must be equal to or larger
than the sample interval. The sample interval must divide exactly into the storage interval (e.g. sample interval: 10 minutes; storage interval: 1 hour ➝ the OTT CTD stores an
arithmetic mean from 6 sample interval values each hour).
Meas. type/Meas.range
Pressure value – set newly
Water level – set newly
Depth to water – set newly
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Additional settings for conductivity, salinity and TDS
the mathematical algorithm on which the calculation
of the specific conductivity at a defined reference
temperature is based. Possibilities: "Freshwater";
Saltwater"; Standard method 2510"; "ISO
7888/EN 27888"; "---" (none). For the "Standard
method 2510", the reference temperature can be
selected: 20 °C or 25 °C.
the mathematical algorithm on which the calculation
of the salinity is based. Possibilities: "Standard
method"; "USGS 2311". With the calculation
method USGS 2311, the unit is "ppt"; with the
standard method the unit "PSU" is fixed.
With the check box activated, the datalogger saves
the values. With the check box deactivated, the
instantaneous values are still visible in the observer
window.
Other displays in the "Basic operation" window
Measuring range Measuring range of the pressure probe – see Fig. 1
System length Cable length including communication unit / pressure
probe (see Fig. 1)
Date/time Internal date/time of the OTT CTD
Detailed information on the "Advanced operation" function can be found in the
online help.
Factory settings
OTT CTD
Number Serial number
Name OTT CTD 1
Water level/Pressure Temperature
Number 0001 0002
Measurement type Water level Temperature
Type of output Water level/depth
Unit m °C
Decimal places 3/2 2
Sample interval 1 h 1 h
Storage interval 1 h 1 h
Conductivity Salinity TDS
Number 0004 0005 0006
Name Specific Conductivity Salinity TDS
Unit mS/cm PSU mg/l
Decimal places 2
Measuring range 0.10 …100.00 mS/cm 2 … 42.00 PSU
Temperature compensation Fresh water
Calculation method Standard method
Sample interval 1 h 1 h 1h
Storage interval 1 h 1 h 1h
deactivatedModem/ITC
connected
Store salinity
Store TDS
Calculation method
(Salinity)
Temperature compen sation (Conductivity)
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23
7.4 Saving/loading OTT CTD configuration
The functions "Load" and "Save" are provided to archive the OTT CTD configuration
on a PC. For example, you can provide multiple OTT CTDs with the same confi guration.
To store a configuration
Select the "Save configuration" function in the "File" menu (or use the button)
➝ the operating program stores the configuration under the name and number
of the OTT CTD. When changes are made to a configuration that has already
been saved, confir
m the window that appears: "Warning, this configuration
name already exists! Overwrite?" with "Y
es" (otherwise save the configuration
under a different station number).
To load a configuration, proceed as follows
Select the "Load configuration" function in the "File" menu (or use the button).
For an already opened configuration, confirm "Ignore changes?" message with
"Yes" (if necessary, save configuration previously).
In the "Saved OTT CTD Configurations" window, select the configuration by
double-clicking it
➝ the operating program loads the configuration.
7.5
Importing/exporting an OTT CTD configuration
To transfer an OTT CTD configuration, via diskette or E-mail for example, the functions Impor
t/Export are available. Likewise, a configuration can be sent via Export
as an XML file to the OTT Hydras 3 user software. In the process, the OTT Hydras 3
user software completely applies all of the measurement stations / sensor configurations to an OTT Hydras 3 operating range.
Available export/import formats
Export ("BIN" file)
Export to a text file
Export for the OTT Hydras 3 user software
Import ("BIN“ file)
The operating program stores all the necessary data of a configuration depending
on the export type in its own "*.BIN", "*.TXT" or "*.XML" file.
Export a configuration as follows ("
*
.BIN" file)
This export type is required to transfer an OTT CTD configuration as a "
*
.BIN"
file. The configuration can be read back into the OTT CTD operating program via
the "Import configuration" function.
Select the "Export configuration" function in the "File" menu.
In the "OTT CTD expor
t configuration" window, edit the file name if necessary,
select the memor
y location and click on "Save" ➝ the operating program
stores the configuration in a "*.BIN" file.
Note
The file name of the "*.BIN" file is arbitrary. The operating program suggests a
combination of station number and station name.
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24
To export a configuration (text file)
This export type is required to transfer an OTT CTD configuration for documentation
purposes as a "*.TXT" file. This "*.TXT" file can be opened with any text editor or
text processing program.
Select the "Export text file" function in the "File" menu.
In the "OTT CTD export configuration" window, edit the file name if necessary,
select the memor
y location and click on Save ➝ the operating program stores
the configuration in a "*.TXT" file.
Note
The file name of the "*.TXT" file is arbitrary. The operating program suggests a
combination of station number and station name.
To export a configuration (OTT Hydras 3)
This export type is required to transfer an OTT CTD configuration to the OTT
Hydras 3 user software. This "*.XML“ file is read in via the Hydras 3 function
"File", "Import Station Configuration (XML)".
Select the "Export Hydras 3 (XML)" function in the "File" menu.
In the "OTT CTD XML configuration" window
, check the file name, select the
memory location and click on Save ➝ the operating program stores the configuration in a "*.XML" file.
Note
The file name of the "*.XML" file is arbitrary. To avoid affecting later data
transfer, it should not be changed. The operating program proposes a combination of measurement station number and measurement station name along
with the ending "*.STATION.XML".
To import a configuration
Select the "Import Configuration" function in the "File" menu.
In the "OTT CTD Impor
t Configuration" window, select the appropriate "*.BIN"
file and click on Open ➝ the operating program reads in the configuration
from the *.BIN" file. (Prior to this, save any configuration that is already open).
Note
The standard factory configuration can be found on the CD-ROM "OTT CTD
Software".
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25
8 Determining and displaying instantaneous values
(observer function)
The operating program has a so-called "Observer" to enable the determination
and display of instantaneous values. The observer also makes it possible to enter
a manually determined measurement, e.g. contact gauge value, into the datalogger (observer registration).
Various options can be set concerning the observer:
Selection possibility in the start window of the OTT CTD operating program:
– direct and sole call of the observer, or
– calling a window to set the operating parameters
Effect of an optionally entered observer registration (pressure sensor):
– observer registration is used solely as a check value, or
– observer registration leads to a change in the value
(setting offset)
Suppress the display of the instantaneous value (pressure sensor) prior to the
input of an observer registration
Set the observer options as follows
Start the OTT CTD operating program.
Select the "Options" function in the "File" menu. (If the option dialog cannot
be called, a password must first be entered. See Chapter 12)
Activate the check box(es) for the observer option(s) required:
–
Only observer mode
– Do not calculate manual input value with scaling
(only check value/no value change)
– Suppress previous instantaneous value display
Click on the "OK" button.
The combination of "Only obser
ver mode" with a password protects the operating
program against unauthorized input of operating parameters.
The "Advanced operation ..." option displays an additional button in the window
for setting the operating parameters.
Fig. 14: Input window to establish
options for the observer.
For further information on protecting
the OTT CTD operating program with
a password, see Chapter 12.
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26
Call the observer function as follows
Start the OTT CTD operating program.
Set up the PC/OTT CTD communication link (see Chapter 7.2).
Depending on the option set: In the start window of the OTT CTD operating
program, either select "View Instantaneous Values" or "Setup device" and in
the subsequent window select the "View Instantaneous Values" function in the
"OTT CTD" menu
➝ the OTT CTD starts an instantaneous value measurement
and the "Observer" window opens:
If necessary: Input observer registration into the entry field of the pressure
sensor and click on the "Save" button.
If necessary: Start new instantaneous value measurement: click on the "Refresh"
button (" Automatic refresh" automatically star
ts an instantaneous value
measurement every 5 seconds).
End the observer function: click on the "Exit" button and close the OTT CTD
operating program.
Notes
The OTT CTD stores each time the observer function is called in an info channel
with the date and time of day. After reading in and accepting into the OTT
Hydras 3 user software, this information can be displayed in the evaluation
window of a sensor using the "Info Data | Station | Displays" function
("Observer registration general"). They are likewise visible via the "View data",
"Table" function of the OTT CTD operating program.
If the "Do not calculate manual input value with scaling" check box in the
"Options" window is activated, the OTT CTD also stores the input check value,
as well as the current instantaneous value. After reading in and accepting into
the OTT Hydras 3 user software, this information can be displayed in the evaluation window of a sensor using the "Info Data" | "Sensor" | "Displays" function ("Observer registration with check value"). They are likewise visible via the
"View data", "Table" function of the OTT CTD operating program.
Fig. 15: Display/input window "OTT CTD
operating program – observer".
The window displays the current instanta-
neous value for all measurements.
Furthermore, the window displays the
window sensor number/name, the
current battery voltage, the amount
of power used from the batteries up
to now, and the date and time.
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27
9 Reading out data
Read out data as follows (on location)
Start the OTT CTD operating program.
Set up the PC/OTT CTD communication link (see Chapter 7.2).
Press the "Download Data" button in the start window ➝ the operating pro-
gram shows the available sensors and the possible read period. If these parameters
are not visible: press the "Connect" button.
Select the required sensors or "All sensors".
Select the required read period or "All".
Click the "Read out" button ➝ the operating program copies the measured
values from the OTT CTD to the PC. The data are then available in the program
director
y of the operating program.
If necessar
y: Display measurements via the "View/export data" function
and/or expor
t to a software application.
Click on the "Back" button.
Alternative possibilities for readouts:
With the OTT CTD operating program and an OTT ITC
In conjunction with a modem and the OTT ITC intelligent top cap, it is also
possible to establish a remote communication link. See online help.
With the PC application "OTT Hydras 3 (Basic)"
(Select the required station in the tree display by double-clicking, make the
required settings in the subsequent window and click on the "Start" button). For
further information, see the online help for the OTT Hydras 3 (Basic) software.
With a Pocket PC and the "OTT Hydras 3 Pocket" software.
For further information, see the OTT Hydras 3 Pocket operating instructions.
Fig. 16: Read out data.
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28
10 Exporting data
After reading out into the OTT CTD operating program, the measurement and
information data can be found in the "RAWDATA" sub-directory of the program
directory (standard setting: "C:\Program files\OTT\OrpheusMini_CTD\RAWDATA").
To transfer to an external application, you can export the data in various formats:
CSV – structured text file in CSV format (Comma-Separated Values)
Excel – Microsoft Excel spreadsheet program
OTT Hydras 3 – raw data format for the OTT Hydras 3 user software
OTT MIS – OTT-specific file format for automatically importing into the
measurement database of the OTT Hydras 3 user software
Using the "Export Options" dialog window, you can set the location for saving
and, with CSV format, various export parameters also. The data remain in the
sub-directory after export. If necessary, you can specifically delete them.
Info data can only be exported to the OTT Hydras 3 user software.
How to export the data
Step 1 – Make export settings:
Click on the "View/export data" button in the start window.
In the "View/export data" window, click on the "Export Options" button (see
Figure 17).
Enter the path to the storage location of the required export format (standard
setting: "C:\Program files\OTT\OrpheusMini_CTD\Expor
t"). No path can be
set for the "Excel" format: the operating program automatically opens Microsoft
Excel during the export and displays the data in a new worksheet. In format
"Hydras 3" the "?" button can be used to automatically find the installation
director
y of OTT Hydras 3.
In format "CSV": set the "Field separator", "Dec. separator", "Date format"
and "T
ime format". For the date and time formats, the typical windows place-
holders can be used.
Step 2 – Exporting data:
Select the required station/sensor in the list (multiple selection possible).
Click on the "Expor
t ..." button.
Confirm message about successful export with "OK".
If necessary, delete the exported data: click on the "Delete" button.
Confirm the message with "Yes".
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29
11 Displaying data
After reading out into the OTT CTD operating program, the measurement and
information data can be found in the the "RAWDATA" sub-directory of the program directory (standard setting: "C:\Program
files\OTT\OrpheusMini_CTD\RAWDATA"). For an initial check, you can display
the data graphically and numerically and print them out if necessary.
How to display the data graphically
Click on the "View/export data" button in the start window.
Select the required station/sensor in the list (multiple selection possible – info
data can only be displayed numerically).
Click on the "Graphic" button ➝ the operating program displays the window
with the graphical view of the selected data;
– Show ruler: function key "F10"; Move ruler: arrow keys ←→;
– Zoom in: draw the required area by dragging with the mouse;
– Zoom out: function key "F12".
Print graphic: Select the "Print" function in the "File" menu.
Close graphic: Select the "Exit" function in the "File" menu (or ).
How to display the data numerically
Click on the "View/export data" button in the start window.
Select the required station/sensor in the list (multiple selection possible).
Click on the "Table" button ➝ the operating program displays the window with
the numerical view of the data in the OTT data protocol;
– Only display measured values: select "V
alues";
– Highlight special areas (only with information data): Select "Obser
ver &
operation", "Alarm & limit", "Communication & error", "Error & service log".
Print numerical display: Select the "Print" function in the "File" menu.
Close numerical display: Select the "Exit" button (or ).
How to delete the data
Select the required station/sensor in the list (multiple selection possible).
Click on the "Delete" button.
Confirm the confirmation message with "OK".
Fig. 17: Display/export data.
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30
12 Protecting the OTT CTD and OTT CTD operating
program with a password
To prevent any unauthorized input of operating parameters, you can
protect the OTT CTD and
OTT CTD operating program
with a password for each.
How to protect the OTT CTD operating program with a password
Start the OTT CTD operating program.
Select the "Options" function in the "File" menu.
Enter a maximum eight-digit password in the "Password" input field. Permitted
characters 0 … 9, A … Z. (This password is independent of the OTT CTD
password.)
Activate check box "Only observer mode".
Click on the "OK" button.
Close the operating program ➝ the operating program is now protected: the
"Setup device" button in the star
t window is no longer visible.
Caution:
If the password is lost, you can no longer configure or parameterize the
OTT CTD on this PC. If this occurs, contact the OTT HydroService.
The password assigned here only pertains to the OTT CTD operating program
installed on this PC. The OTT CTD itself is not protected by this!
How to release a password-protected OTT CTD operating program
Start the OTT CTD operating program.
Select the "Options" function in the "File" menu.
Enter the password in the "OTT CTD" window.
Click on the "OK" button.
Deactivate the "Only observer mode" check box.
Remove the entry in the "Password" field.
Click on the "OK" button ➝ the operating program is released.
Fig. 18: OTT CTD operating program
release – password input window.
Fig. 17: Protecting the OTT CTD operating
program with a password – input window
to establish a password.
A password-protected OTT CTD operating
program only makes sense if the operating
program starts in observer mode (activate
check box "Only observer mode")!
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31
How to protect the OTT CTD with a password:
Start the OTT CTD operating program.
Set up the PC/OTT CTD communication link (see Chapter 7.2).
Click on the "Setup device" button in the start window.
Click on the "Advanced operation …" button.
(Button not visible? ➝ activate the check box "Advanced operation ..." in the
"Options" function in the "File" menu.)
Click on the "Read" button.
In the tree view, select "Communication Interface".
Enter a maximum eight-digit password in the "Password" input field. Permitted
characters 0 … 9, A … Z. (This password is independent of the OTT CTD
operating program password.)
Click on the "Program" button.
Warning: "Reset OTT CTD and delete data memory additionally?" Confirm
with "No" ➝ the OTT CTD is now protected against unauthorized operation.
Caution: If the password is lost, you can no longer configure or parameterize
the OTT CTD. If this occurs, contact the OTT HydroSer
vice.
How to release a password-protected OTT CTD
Start the OTT CTD operating program.
Set up the PC/OTT CTD communication link (see Chapter 7.2).
Click on the "Setup device" button in the start window
.
Select the "Enter password" function in the "OTT CTD" menu.
Enter password.
Click on the "OK" button.
Confirm message "Password accepted! OTT CTD unlocked" with "OK".
Click on the "Read" button.➝ the operating program reads in the current
OTT CTD operating parameters.
Fig. 20: OTT CTD release –
password input window.
Fig. 19: Protect the OTT CTD
with a password – input window
to establish a password.
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32
13 Date and time settings
The internal clock of the OTT CTD is a high-accuracy, realtime clock. It runs as
soon as batteries are installed in the OTT CTD. After the batteries are removed,
the clock will continue to run for approximately 10 more minutes. For longer periods
of power interruption, the OTT CTD loses the date and time. When batteries are
re-installed, the OTT CTD assumes the date and time of the last stored measured
value, with one minute added to the stored time. The date and time are set using
the OTT CTD operating program.
Set the date and time as follows
Start the OTT CTD operating program.
Set up the PC/OTT CTD communication link (see Chapter 7.2).
Click on the "Setup device" button in the start window.
Select the "Date/time" function in the "OTT CTD" menu ➝ the operating
program reads the date and time out from the OTT CTD and opens the
"OTT CTD – date/time" window
.
If necessary: click on the "Refresh" button ➝ the OTT CTD reads out the date
and time again.
If necessary: set the values required in the two input fields.
Click on the "Set date/time" button ➝ the operating program sets the OTT CTD
date and time to the PC time/date or the values set.
Caution: If the PC is on summer time mode (ID: PC (DST)), the operating program automatically uses the standard time without summer correction (winter
time). T
o receive continuous time series, it is a good idea not to use summer time
in the OTT CTD.
In connection with a GPRS remote data transfer and the "Time synchronization"
function, it is necessary to refer the time to UTC/GMT and to set the time zone of
the station in the "Advanced operation" | "OTT CTD" window. (see online help)
Click on the "Exit" button. The "OTT CTD – date/time" window closes.
Fig. 21: OTT CTD date and time settings.
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33
14 Deleting data memory
Caution: The stored measured values in the OTT CTD are permanently lost when
deleting the data memory! If necessary read out measured values before deleting!
Delete the data memory as follows
Start the OTT CTD operating program.
Set up the PC/OTT CTD communication link (see Chapter 7.2).
Click on the "Setup device" button in the start window.
Select the "Delete data memory" function in the "OTT CTD" menu.
Acknowledge the warning "Are you sure you want to delete data memory?"
with "Y
es "➝ the operating program deletes the complete data memory of the
OTT CTD (all measurement channels including the info channel). Afterwards the
OTT CTD deter
mines and saves the water level, the water temperature and the
specific conductivity again in accordance with the sample interval set.
15 Update OTT CTD firmware
If necessary, you have the possibility to update the OTT CTD firmware (operating
system). This makes sense if, for example, devices delivered at different times are
to receive the same operating system version. Updating is carried out via the
OTT CTD operating program. According to availability, an updated version of the
OTT CTD firmware can be found on the internet site "www.ott.com".
How to update the firmware
Download the new version of the firmware (file: e.g. "OTT_CTD_V1.00.3.bin")
from the Inter
net site.
Copy the file "OTT_CTD_VX.XX.X.bin" to the directory in which the OTT CTD
operating program is located.
Set up the PC/OTT CTD communication link (see Chapter 7.2).
Select the "Firmware update" function in the "OTT CTD" menu.
Confirm message with "Yes"
➝ the operating program copies the new
fir
mware to the OTT CTD. Afterwards the OTT CTD determines and saves the
water level, the water temperature and the specific conductivity again in accordance with the sample interval set.
Caution: During the update, avoid breaking the communication link (e.g by
accidentally removing the OTT DuoLink from the infrared inter
face of the
OTT CTD.) If the communication link is broken, the firmware will no longer run!
In the same way, no other programs should be started or files opened during
the copying process!
Notes
If there are multiple ".bin" files in the directory, you will have to manually select
the required file.
The measurements saved in the OTT CTD are not lost after an update.
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34
16 Maintenance work
16.1 Cleaning the pressure probe
Recommended interval: every 12 months
with difficult local measuring conditions (heavy deposits):
as required every 4 to 6 months.
(Measurements that are inaccurate or not plausible
indicate a soiled pressure sensor.)
How to clean the pressure probe
Open the top cap/observation well cover.
Completely remove the OTT CTD from the observation well.
Remove the black protective cap.
Clean the pressure sensor carefully using a brush and water.
Clean graphite electrodes and temperature sensors for the conductivity sensor
with soapy water and cotton buds. Lime scale deposits can be removed using
a common household scale remover
. Make sure to follow the use and safety
instructions of the scale remover!
Rinse the pressure probe thoroughly with clear water.
Reattach the black protective cap.
Recommendation: Calibrate the conductivity sensor (see Chapter 16.4).
Reinstall OTT CTD (see Chapter 6).
Determine current reference value with a contact gauge and enter it
(see Chapter 7.3 or 8).
Close the top cap/observation well cover
.
Fig. 22: Cleaning the pressure probe.
Black
protective cap
Pressure Sensor
Pressure probe with
conductivity sensor
and datalogger
Conductivity
sensor
Graphite
electrodes
Temperature sensor
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35
16.2 Replacing the desiccant capsules
Recommended interval: Depending on the level of air humidity at the station
every 12 to 24 months and when replacing the batteries.
How to replace the desiccant capsules
Open the top cap/observation well cover.
Pull the communication unit approximately 80 cm out of the observation well
and hold (a second person would be useful).
Slide the pipe casing of the communication unit approximately 30 cm in the
direction of the pressure probe cable. (The rubber stop located on the pressure
probe cable (see Fig. 1) prevents the pipe casing from falling.)
Remove used desiccant capsules.
Install 2 new desiccant capsules.
Slide the pipe casing of the communication unit back on until it stops.
Slowly and carefully replace the communication unit into the observation well.
Close the top cap/observation well cover.
16.3 Checking/replacing the batteries
See Chapter 5
16.4 Calibrating the conductivity sensor
The goal of the calibration is to deter
mine the so-called "cell constant" for the con-
ductivity sensor. To do this, it is necessary to check the zero point and to carr
y out
a conductivity measurement with a standardized calibration solution.
The cell constant – as well as the unchanging geometric measurements, the mate rials used and the construction of the conductivity sensor – takes account of the
aging process of the electrodes.
Recommended interval: every 12 months (after every cleaning)
with difficult local measuring conditions (heavy deposits):
as required every 4 to 6 months
Required accessories: standardized calibration solution, calibration container
(see Chapter 2, "Order numbers")
Fig. 23: Replacing the desiccant capsules
+
Pipe casing
Communication unit
+
+
Dessicant capsules
Backstop
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36
Caution: For an optimum calibration process, the OTT CTD and the calibration
solution must be at the surrounding temperature!
How to calibrate the conductivity sensor
Carefully clean the pressure probe and dry well (see Chapter 16.1).
Start the OTT CTD operating program.
Set up the PC/OTT CTD communication link (see Chapter 7.2).
Press the "Setup device" button. (Button not visible? ➝ deactivate the "Only
obser
ver mode" check box in the "Options" function in the "File" menu and
restart the operating program.)
Select the "Calibrate conductivity sensor" function in the "OTT CTD" menu.
Press the "Start zero point test" button. The operating program starts an instan-
taneous value measurement and updates this ever
y 5 to 6 seconds. If the mea-
surement result displayed (blue triangle) is not in the green area
➝ clean the
conductivity sensor again and dry it well.
Press the "End zero point test" button.
Select the calibration solution used. Alternatively
, select "Other ..." and enter
the appropriate conductivity value.
Add the calibration solution to the calibration container (filling height approx. 3/4).
Place the OTT CTD into the calibration container (screw-on cover in place) and
tighten the screw-on cover by hand. Caution: There must not be any air bubbles in the slot of the conductivity sensor! If necessar
y, lightly shake the calibra-
tion container.
Press the "Start calibration" button. The operating program star
ts the instan -
taneous value measurement again and continuously updates it.
Wait until the values for conductivity and temperature do not change for sever-
al updates. The operating program displays the current and newly calculated
cell constant. Caution: T
emperature values shown in red ➝ the conductivity
sensor is not at the temperature of the calibration solution! New cell constant
shown in red ➝ the cell constant lies outside the valid range.
Press the "End calibration" button.
Confirm the resulting question: "Save new cell constant?":
–
cell constant is within the tolerance range ➝ "No"
(conductivity value is in the green area)
–
Cell constant is outside the tolerance range and within the valid range ➝
"Y
es" (conductivity value is in red area + current cell constant is shown in
black)
If the cell constant is outside the valid range ➝ error message.
Close the OTT CTD operating program.
Rinse the pressure probe thoroughly with clear water!
Reinstall OTT CTD (see Chapter 6).
Determine current reference value with a contact gauge and enter it
(see Chapter 7.2 or 8).
Close the top cap/observation well cover.
Dispose of the used calibration solution!
Notes
Only use the calibration solution once!
Always store the calibration solution in a closed container! (The carbon dioxide
in the surrounding air and evaporation can change the conductivity value.)
Avoid water entering the calibration solution! Always dry the calibration container carefully after calibration.
Calibration solution can be disposed of in the normal public sewer system!
The OTT CTD saves the last three cell constants in a history (see "Advanced
operation ...", channel "Conductivity").
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37
17 Error messages
If erroneous measurements occur, or if an operating fault occurs, the OTT CTD
stores one of the following error messages in the data memory instead of a
measured value.
Err 00 internal error (automated measurement)
Err 01 internal error (AD conversion error)
Err 03 Exceeded measuring range
Err 05 An input value required for the measurement calculation is not in the
valid range (example: the temperature value needed for the calculation
of the salinity (standard method) is outside of the valid range :
0 °C ≤ t ≤ 35.0 °C)
Err 06 An input value for the measurement calculation is missing
Err 10 Measured value (still) not recorded
Internal errors indicate a device defect if they occur repeatedly.
18 Troubleshooting/fault correction
No communication possible (operating program/OTT CTD)
Password programmed?
➝ input correct password.
Batteries installed?
➝ install batteries.
Battery voltage lower than about 3.6 V?
➝ insert new batteries.
Battery contacts corroded?
➝ carefully clean the battery contacts.
Pressure probe cable damaged?
➝ send OTT CTD to the factory for repair.
Infrared interface dirty?
➝ clean the infrared interface carefully with a damp, soft cloth.
Setting measured value not possible?
➝ scaling module missing. Check configuration*
(for advanced operation, see online help).
Communication starts and then breaks off
Battery voltage lower than about 3.6 V?
➝ insert new batteries.
Distance from readout unit/IrDA interface to OTT CTD too small/large?
➝ maintain correct distance (see Chapter 7.2).
Erroneous measured values
Temperature values erroneous
➝ check configuration* (for advanced operation, see online help).
Pressure sensor values erroneous
➝ check configuration* (for advanced operation, see online help).
➝ check the pressure compensation capillary in the communication unit
(blocked?). If necessary, clean.
➝ check pressure sensor for contamination. Clean if necessary.
* The standard factory configuration is located on the "OTT CTD software" CD-ROM .
Page 38
Conductivity values erroneous
➝ check configuration* (for advanced operation, see online help).
➝ check conductivity sensor for contamination. If necessary, clean and then
recalibrate
Calculated salinity values erroneous (Err 05)
➝ check configuration* (for advanced operation, see online help).
➝ input value is outside valid range:
– salinity by standard method
1.0 °C ≤ t ≤ 35.0 °C for salinity 2.0 PSU ≤ salinity ≤ 42.0 PSU
– Salinity by "USGS 2311" method
0 °C ≤ t ≤ 30.0 °C for salinity 2.0 ppt ≤ salinity ≤ 60.0 ppt
Observer does not display calculated salinity values
➝ values lie outside the valid range:
– salinity according to standard method
2.0 PSU ≤ salinity ≤ 42.0 PSU
– salinity according to "USGS 2311" method
2.0 ppt ≤ salinity ≤ 60.0 ppt
No measured values in database
Configuration incorrect?
➝ check configuration* (for advanced operation, see online help).
Battery voltage lower than about 3.6 V?
➝ insert new batteries.
* The standard factory configuration is located on the "OTT CTD software" CD-ROM .
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19 Repair
20 Notes about the disposal of old units
Within the member countries of the European Union
In accordance with the European Union guideline 2002/96/EC, OTT takes back
old devices within the member countries of the European Union and disposes of
them in an appropriate way. The devices concerned by this are marked with the
symbol shown aside.
For further information on the return procedure, please contact your local sales
contact. Y
ou will find the addresses of all sales partners in the internet on
"www.ott.com". Please take into consideration also the national implementation
of the EU guideline 2002/96/EC of your country
.
For all other countries
Dispose of the OTT CTD properly after taking out of service.
Observe the regulations valid in your country for the disposal of electronic
devices.
Never put the OTT CTD into the normal household waste.
Materials used
See Chapter 21, T
echnical data
39
With a problem with the device, use Chapter 18, Troubleshooting/fault correction
to see if you can resolve the problem yourself.
In case of device defects, please contact the repair center of OTT:
OTT Hydromet GmbH
Repaircenter
Ludwigstrasse 16
87437 Kempten · Ger
Telephone +49 831 5617-433
Fax +49 831 5617-439
[email protected]
Caution: Only have a defective OTT CTD checked and repaired by the OTT
repair center. Under no circumstances carr
Any repairs or attempted repairs carried out by the customer will result
in the loss of any guarantee rights.
many
y out any repairs yourself.
Page 40
21 Technical data
Water level
Measuring range 0 … 4 m water column (0 ... 0.4 bar)
0 … 10 m water column (0 ... 1 bar)
0 … 20 m water column (0 ... 2 bar)
0 … 40 m water column (0 ... 4 bar)
0 … 100 m water column (0 ... 10 bar)
Resolution* 0.001 m; 0.1 cm; 0.01 ft; 0.1 inch
0.0001 bar; 0.001 psi
Accuracy (linearity + hysteresis) ± 0.05 % full scale
Long-term stability (linearity + hysteresis) ± 0.1 %/a full scale
0-Point ± 0.1 % full scale
Overload safe without permanent mechanical damage
0 ... 0.4 bar 4 bar
0 ... 1 bar 10 bar
0 ... 2 bar 15 bar
0 ... 4 bar 25 bar
0 ... 10 bar 40 bar
Units m, cm, ft, inch, bar, psi
Pressure sensor ceramic; temperature-compensated
Temperature-compensated operating range –5 °C … +45 °C (ice free)
Temperature
Measuring range –25 °C … +70 °C
Resolution 0.01 °C
Accuracy ± 0.1 °C
Units °C · °F
Conductivity
Measuring ranges 0.001 … 2.000 mS/cm
0.10 … 100.00 mS/cm
Resolution
0.001 …2.000 mS/cm 0.001 mS/cm
0.10 …100.00 mS/cm 0.01 mS/cm
Accuracy
0.001 …2.000 mS/cm ±0.5 % of measured value (at least ±0.001 mS/cm)
0.10 …100.00 mS/cm ±1.5 % of measured value (at least ±0.01 mS/cm)
Units
0.001 …2.000 mS/cm mS/cm · μS/cm
0.10 …100.00 mS/cm mS/cm
Power supply 3 x 1.5 V batteries (LR6 · AA, FR6 · AA)
alkaline or lithium design
(LiFeS; Energizer L91)
Current consumption
active, measurement 55 mA
active, communication 65 mA
passive 23 μA
Lifetime (1 h sample interval; 50 m system length; w/o ITC)
with lithium batteries at least 5 years
with alkaline batteries at least 1.5 years (high quality battery types)
Clock
Design real time clock
Accuracy ±1 minute/month (at +25 °C)
Buffer period for battery replacement approx. 10 minutes
Interface Infrared (IrDA)
Storage temperature –40 °C … +85 °C
* at a value range of ±32.750 m; ±3275.0 cm; ±327.50 ft; ±3275.0 inch; ±3.2750 bar; ±32.750 psi
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Data memory
Measurement memory 4 MB
Number of measurements approx. 500,000
Number of logical channels 9 + 1 Info channel
Physical channels (input signals) Water level/pressure
Temperature
Conductivity
Supply voltage
Sample interval 5 seconds … 24 hours
Storage interval (mean interval) 5 seconds … 24 hours
Individually configurable functions – Simple or advanced operation
– 5 extended sample intervals with start/stop time indication, support of
pump tests
– Selection of units
– Pressure/level measurement or depth measurement
– With consideration of the local gravitational acceleration
– Compensate for water density using salinity and temperature
– Temperature compensation for conductivity. Options: Freshwater;
Saltwater; Standard method 2510 (reference temperature: 25 °C or
20 °C); ISO 7888 / EN 27888; none
– Salinity (standard method or USGS 2311)
– Display of instantaneous values with level monitoring function
– Password protection
– Measured value processing: Calculation of mean; delta storage; scal-
ing function; extreme value storage; limit control of the sample interval
– Virtual sensor/virtual terminal
– Together with OTT ITC: alarm management; remote data transfer
Mechanical Data
Can be installed in observation wells
– with adapter ring 1"
– with adapter plates for top caps 2", 3", 4", (4,5"), 5", 6"
with recess (OTT, HT)
– with suspension brackets for top caps ≥ 2"
without recess/universal installation
Dimensions
Communication unit L x Ø 400 mm x 22 mm
Pressure probe (L x Ø) 317 mm x 22 mm
System length (cable length including 1,5 … 200 m ±1 % ±5 cm
communication unit/pressure probe)
Weight
communication unit (incl. batteries) approx. 0.410 kg
pressure probe approx. 0.430 kg
Pressure probe cable approx. 0.082 kg/m
Material
Pressure probe housing ABS, POM, stainless steel 1.4539 (904 L)
Cable jacket PUR
Communication unit ABS, PC, stainless steel 1.4539 (904 L)/ 1.4462 (UNS S31803)
Protection class
Communication unit IP 67 (submersion depth max. 2 m; submersion duration max. 24 h)
Pressure probe IP 68
EMC limits
– Resistance to electrostatic discharge (ESD) complies with EN 61000-4-2 (4 kV contact discharge)
– Resistance to electromagnetic fields complies with EN 61000-4-3 (10 V/m)
– Resistance to transient fields (burst) complies with EN 61000-4-4 (2 kV)
– Resistance to surge complies with EN 61000-4-5 (4 kV)
– Resistance to HF, asymmetric complies with EN 61000-4-6 (10 V)
– Line-borne and radiated interference complies with EN 55022 Class B (30 … 1000 MHz)
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Appendix A – Declaration of conformity for OTT CTD
42
Page 43
43
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Document number
55.445.001.B.E 02-0411
OTT Hydromet GmbH
Ludwigstrasse 16
87437 Kempten · Germany
Tel. +49 831 5617- 0
Fax +49 831 5617- 209
[email protected] · www.ott.com
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