wtw Oxi 170 User manual

ba24105e08 11/2010
Oxi 170
Operating instructions
Oxygen Monitor
Oxi 170
O
mg/l
1
1
85
°
C
REL1
5 6

Oxi 170
64 ba24105e08 11/2010
Accuracy when
going to press
The use of advanced technology and the high quality standard of our
instruments are the result of continuous development. This may result
in differences between this operating manual and your instrument.
Also, we cannot guarantee that there are absolutely no errors in this
manual. Therefore, we are sure you will understand that we cannot
accept any legal claims resulting from the data, figures or descriptions.
Copyright ©Weilheim 2010, WTW GmbH
Reprinting - even as excerpts - is only allowed with the explicit written
authorization of WTW GmbH, Weilheim.
Printed in Germany.

Oxi 170 Contents
65
ba24105e08 11/2010
Oxi 170 - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
1.2 Outputs and interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
1.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
1.2.2 Freely configurable relay (RT and RT RS option) . . . . . . . . . . . . . . . . . . . . . . . . 68
1.2.3 SensCheck relay (sensor monitoring) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
1.2.4 RS 485 digital interface (RT RS option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
1.3 Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
2 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
2.1 User qualification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
2.2 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
2.3 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
3.1 Onsite installation: General instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
3.2 Electrical terminal strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
3.3 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
3.3.1 General installation instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
3.3.2 Line power connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
3.3.3 Relay contacts and current outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
3.3.4 RS 485 digital interface (RS option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
3.4 Connecting the sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
3.4.1 Connecting the oxygen (D.O.) sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
3.4.2 Cable extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
4.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
4.2 Operating keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
4.3 Operating levels and general operating principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
4.4 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
4.4.1 Call up configuration level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
4.4.2 Configuration setting table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
4.5 Parameterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
4.5.1 Calling up the parameterization level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
4.5.2 Setting table of parameterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
4.6 Freely configurable relays (RT and RT RS option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
4.6.1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
4.6.2 Limit indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Contents Oxi 170
66 ba24105e08 11/2010
4.6.3 Timer for external sensor cleaning system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
4.6.4 Display of the relay states in the operating level . . . . . . . . . . . . . . . . . . . . . . . . . 100
4.7 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
4.8 Display of instrument information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
4.9 Test mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
5 Maintenance and cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
6 What to do if ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
7 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
8 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
8.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
8.2 Measurement characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
8.2.1 Oxygen measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
8.2.2 Temperature measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
9 Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
9.1 Display abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
9.2 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
9.3 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Oxi 170 Overview
67
ba24105e08 11/2010
1Overview
1.1 General features
Fig. 1-1 Oxi 170
1Watertight housing (IP 66)
2Display
3Operating keys
4Sensor input socket
5Cable glands
Oxi 170
1
2
3
5
4
O
mg/l
1
1
85
°
C
REL1
5 6

Overview Oxi 170
68 ba24105e08 11/2010
1.2 Outputs and interfaces
1.2.1 Overview
The monitor has the following outputs and interfaces depending on the
instrument version:
1.2.2 Freely configurable relay (RT and RT RS option)
Both potential-free K1 and K2 relays of the RT and RT RS instrument
versions can be used as follows:
zAs a fault indicator if the power fails
zAs an indicator relay for a frozen measured value (e.g. when
calibrating)
zAs a threshold indicator if a specified threshold is undercut or
exceeded (main measured value)
zAs a control relay with timer function, e.g. for time-controlled sensor
cleaning operated by compressed air.
1.2.3 SensCheck relay (sensor monitoring)
The SensCheck relay is designed as a closer (galvanically separated
from the instrument). It becomes active if a sensor error such as a hole
in the membrane cap occurs. At the same time, the SensCheck symbol
appears on the display (see section 4.1).
Instrument version Relays Current outputs Digital
interfaces
Oxi 170 (standard) 1 x SensCheck 1 x analog output for
measured D.O. value
-
Oxi 170 RT 2 additional, freely
configurable relays
1 additional analog output
for the measured
temperature value
-
Oxi 170 RT RS as RT option as RT option 1 x RS 485

Oxi 170 Overview
69
ba24105e08 11/2010
1.2.4 RS 485 digital interface (RT RS option)
The monitor can communicate with other instruments via the RS 485
digital interface of the RS instrument versions.
The following operating modes are possible:
zMaster mode (Prn mode): Unidirectional mode for the output of
measured values. The main and auxiliary measured values are sent.
The interface is constantly active in master mode. The data are sent
to a data terminal (e.g. PC with terminal software or printer).
zSlave mode (SL mode): Bidirectional mode in the bus network. In this
operating mode the monitor ("slave") works together with a control
computer ("master") on the master/slave principle. A total of 31
slave devices can be connected to one master in the bus network.
All slave devices are addressed by the control computer under their
bus address and execute the transferred commands, e.g. sending
measured values, calibration data and relay states.
Note
The RS 485 interface that accompanies the RT RS instrument versions
is described in detail in a separate manual.
PROFIBUS connection The monitor can be connected to a PROFIBUS DP network via the
RS 485 interface with the PROFIBUS converter PKV 30-DPS that is
available as an accessory.
1.3 Nameplate
Fig. 1-2 Nameplate (example)
The nameplate also includes the serial number as well as details of the
supply voltage and the installed instrument options. The nameplate is
located on the right side of the housing.
Ser.-Nr: xxxxxxxxx
230 VAC 50/60Hz 18VA
WTW
Oxi 170-RTRS
Instrument options

Overview Oxi 170
70 ba24105e08 11/2010

Oxi 170 Safety instructions
71
ba24105e08 11/2010
2 Safety instructions
This operating manual contains essential instructions that have to be
followed during the commissioning, operation and maintenance of the
Oxi 170 monitor. Thus, it is essential for the operator to read this
component operating manual before carrying out any work with the
system. Always keep this operating manual available close to the
Oxi 170 monitor.
General safety
instructions
Safety instructions in this operating manual are indicated by the
warning symbol (triangle) in the left column. The signal word (e.g.
"'CAUTION") indicates the severity of the danger:
WARNING
indicates instructions that must be followed precisely in order to
prevent serious danger to personnel.
CAUTION
indicates instructions that must be followed precisely in order to
avoid slight injury to personnel or damage to the instrument or the
environment.
Other labels
Note
This symbol indicates instructions that describe special features.
Note
This symbol indicates cross-references to other documents, e.g.
component operating manuals.
2.1 User qualification
Special user
qualifications
The following installation activities may only be performed by a
qualified electrician:
zConnection of the Oxi 170 monitor to the mains supply.
zConnection of external, mains voltage conducting power circuits to
the Oxi 170 monitor.

Safety instructions Oxi 170
72 ba24105e08 11/2010
2.2 Authorized use
The authorized use of the Oxi 170 monitor consists solely of stationary
measurement in water and wastewater applications, seawater,
brackish water and aquacultures. Read the technical specifications in
accordance with chapter 8 TECHNICAL DATA. Only operation and use
according to the instructions in this operating manual is authorized.
Any other use is considered as unauthorized. Unauthorized use
invalidates any claims with regard to the guarantee.
2.3 General safety instructions
The Oxi 170 monitor is manufactured and tested in accordance with the
relevant guidelines and standards for electronic instruments (see
chapter 8 TECHNICAL DATA). It left the factory in perfect condition.
Function and
operational safety
The flawless functioning of the Oxi 170 monitor is only guaranteed if
attention is paid to the generally accepted safety measures and the
special safety instructions in this operating manual during use.
The flawless functioning and operating safety of the Oxi 170 monitor is
only guaranteed under the ambient conditions specified in
chapter 8 TECHNICAL DATA.
Safe operation Assuming that risk-free operation is no longer possible, take the
Oxi 170 monitor out of operation and secure it against unintentional
operation.
Risk-free operation is no longer possible if the Oxi 170 monitor:
zhas been damaged in transport
zhas been stored under adverse conditions for a lengthy period of
time
zis visibly damaged
zno longer operates as described in this manual.
If in doubt, contact the supplier of the Oxi 170 monitor.

Oxi 170 Installation
73
ba24105e08 11/2010
3 Installation
3.1 Onsite installation: General instructions
The measurement location must meet the environmental conditions
specified in chapter 8 TECHNICAL DATA.
Outdoor mounting Pay attention to the following points for outdoor installations:
zAlways protect instruments installed outdoors against rough
weather conditions with a protective cover.
zClose the housing cover after installation to ensure tightness (IP 66).
zAlso seal all cable glands that are not required with matching
dummy plugs.
Installation on a wall or
under a protective cover
The instrument is mounted on a wall or under a protective cover
through 4 boreholes in the rear panel of the housing. The boreholes are
accessible when the housing cover is open.
Fig. 3-1 Mounting boreholes of the Oxi 170
The clearances of the boreholes are given in the dimensional drawing
in the chapter 8 TECHNICAL DATA. For wall mounting, use the suitable
material (screws, wall plugs, etc.).
-+-
ih gfed
cba
Rec2 L1N
K2 K1
RS
Option
Sensor/Probe Rec1
Netz
Mains
cOption
ba
+
X2 X1
13 12 11 1110 1099 88 77 66 55 44 332211

Installation Oxi 170
74 ba24105e08 11/2010
3.2 Electrical terminal strip
The terminal strip of the Oxi 170 is accessible after the housing cover
has been opened:
Fig. 3-2 Terminal strip Oxi 170 inside the housing
Terminal connections
* Connection of monitors with 24 V DC supply voltage:
– N = GND
– L1 = +24 V DC
-+-
ih gfed
cba
Rec2 L1N
K2 K1
RS
Option
Sensor/Probe Rec1
Netz
Mains
cOption
ba
+
X2 X1
13 12 11 1110 109 9 88 77 66 55 44 332211
No. X1 X2
1RS 485 A (RS option) Current output REC1+
2RS 485 B (RS option) Current output REC1-
3RS 485 GND (RS option) Current output REC2+
(RT option)
4SensCheck relay Current output REC2-
(RT option)
5SensCheck relay a / Sensor
6Relay K1 (RT option) b / Sensor
7Relay K1 (RT option) c / Sensor
8Relay K2 (RT option) d / Sensor
9Relay K2 (RT option) e / Sensor
10 N (mains) * f / Sensor
11 L1 (mains) * g / Sensor
12 - h / Sensor
13 - i / Sensor

Oxi 170 Installation
75
ba24105e08 11/2010
3.3 Electrical connection
3.3.1 General installation instructions
Pay attention to the following points when connecting cable wires to the
terminal strip:
zShorten all the wires to be used to the length required for the
installation
zFit all wires with wire sleeves before connecting to the terminal strip
zAny wires that are not used and project into the housing must be cut
off as closely as possible to the cable gland. Seal all open cable
glands with matching blind plugs.
WARNING
Free wires must not protrude into the housing of the Oxi 170.
Danger of short-circuit and fire! Touch-proof circuits can also
come into contact with dangerous voltages if touched and lead to
life threatening situations when working with the Oxi 170. Always
cut off any unused wires as closely as possible to the cable gland.

Installation Oxi 170
76 ba24105e08 11/2010
3.3.2 Line power connection
WARNING
If the power supply is connected incorrectly, it may represent a
danger to life from electric shock. Pay attention to the following
points during installation:
zThe monitor must only be connected by an electrician.
zThe monitor must only be connected in a voltage-free
condition.
zThe power supply must fulfill the specifications given on the
nameplate and in chapter 8 TECHNICAL DATA.
zA switch or circuit breaker must be provided in the building
installation as an interrupt facility for the monitor. The interrupt
facility must be
– installed close to the monitor and easy to reach by the user
and
– marked as an interrupt facility for the monitor.
zThe monitor must only be opened after installation if the mains
voltage has been switched off beforehand.
The correct voltage is given on the nameplate (see section
1.3 NAMEPLATE). In all cases check that the correct mains voltage is
present prior to installing the instrument.

Oxi 170 Installation
77
ba24105e08 11/2010
3.3.3 Relay contacts and current outputs
WARNING
If external electrical circuits that are subject to the danger of
physical contact are incorrectly connected to the relay contacts,
there may be a danger of life threatening electric shock. Electrical
circuits are regarded to be subject to the danger of physical
contact when there are voltages higher than the Safety Extra Low
Voltage (SELV).
Pay attention to the following points during installation:
zElectrical circuits subject to the danger of physical contact
must only be connected by a qualified electrician.
zElectrical circuits subject to the danger of physical contact
must only be connected when they are voltage-free.
zSwitching voltages and switching currents on the relay
contacts must not exceed the values specified in
chapter 8 TECHNICAL DATA. Protect electrical circuits against
currents that are too high with an electrical fuse.
zAfter the monitor has been installed, it may only be opened if
the mains voltage and all external voltages have been switched
off beforehand.
An overview of the relay and current outputs of the individual
instrument versions can be found in section 1.2 OUTPUTS AND
INTERFACES. The configuration and parameterization is described in
sections 4.4 to 4.5.
3.3.4 RS 485 digital interface (RS option)
Note
The connection of the monitor to other instruments via the RS 485
interface is described in detail in a separate manual that accompanies
the RT RS instrument versions.

Installation Oxi 170
78 ba24105e08 11/2010
3.4 Connecting the sensors
3.4.1 Connecting the oxygen (D.O.) sensor
WTW online D.O. sensors have a permanently mounted connection
cable with a 7-pin plug adapter.
Connection Connect the plug adapter of the sensor connection cable with the
sensor input jack of the monitor:
Fig. 3-3 Connection of the D.O. sensor.
Oxi 170
O
mg/l
1
1
85
°
C
REL1
5 6
TriOxmatic®690
TriOxmatic®70x
CellOx®700
Oxi 170

Oxi 170 Installation
79
ba24105e08 11/2010
3.4.2 Cable extension
The EK 170 cable (order no. 108 206) can be used in conjunction with
the KI/S terminal box (order no. 108 606) for cable extension between
the sensor/electrode and the monitorand the K 160 cable plug (order
no. 109 508) .
The maximum cable length between the electrode and monitor
including the length of the sensor connection cable is 100 m.
Note
The wiring is described in the mounting instructions of the KI/S terminal
box.

Installation Oxi 170
80 ba24105e08 11/2010

Oxi 170 Operation
81
ba24105e08 11/2010
4 Operation
4.1 Display
Display elements
SensCheck symbol The SensCheck symbol indicates a sensor error. Depending on the
sensor type, this may be one of the following errors:
1Upper display line:
Measured oxygen value, operator guidance
2SensCheck symbol
3Lower display line:
Measured temperature value, operator guidance
4Status displays, depending on instrument status
and operating situation
Sal
%
mg/l
Sal
O
8
8
88
1
°
C
Oxi Cal AR
Ident
Auto REL2
Baud
REL1
S
8 8 8
1
2
3
4
Oxi 170
= Electrolyte solution depleted
= Membrane defective or leaky

Operation Oxi 170
82 ba24105e08 11/2010
4.2 Operating keys
The monitor is operated via the following six keys below the display:
Key functions Key Function
Call up measuring mode
<M>
Start calibration (only active in measuring mode)
<C>
In measuring mode: Display the sensor slope
Confirm current selection
<ENTER>
Leave the menu
<ESC>
Increase the value,
scroll upwards in the selection,
or navigate one menu level upwards
<UP>
Decrease the value,
scroll downwards in the selection,
or navigate one menu level downwards
<DOWN>