wtw EcoLine pH 170 User manual

General informations
92
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 meter. We cannot guarantee that there are
absolutely no errors in this manual. We are sure you will understand that we cannot
accept any legal claims resulting from the data, figures or descriptions. The
information in this manual is subject to change without any notice.
Warranty
The designated meter is covered by a warranty of 2 years from the date of
purchase.
The meter warranty extends to manufacturing faults that are determined within the
period of warranty. The warranty excludes components that are replaced during
maintenance.
The warranty claim extends to restoring the meter to readiness for use but not,
however, to any further claim for damages. Improper handling or unauthorized
opening of the meter invalidates any warranty claim.
To ascertin the warranty liability, return the meter and proof of purchase together
with the date of purchase freight paid or prepaid.
Copyright
Weilheim 2006, WTW GmbH
Reprinting – even in the form of excerpts – is only allowed with the explicit written
authorization of WTW GmbH, Weilheim.
Printed in Germany.

Safety Instructions
pH 170/
pH 296
93
Please read these safety instructions carefully before installing the
instrument!
This instrument is built according to the safety rules for electronic measuring
instruments and left the factory in a safe and secure condition from a safety
engineering aspect (IEC 1010).
The smooth functioning and operational safety of the equipment can only be
guaranteed by following the general safety precautions applicable and the special
safety instructions given in this operating manual.
−Before switching on the instrument, ensure that the operational voltage
specified for the instrument correspond to the power supply.
(specification of the ranges of the voltage supply).
−This instrument may only be operated using accessories that comply with the
specifications in the chapter "Technical Data" in this operating manual.
The manufacturer accepts no liability for damage resulting from the use of
unsuitable accessories.
−The trouble-free function and operational safety of the instrument can only be
guaranteed by following the climate conditions specified in the chapter
"Technical data" in this operating manual.
−Opening of the instrument as well as adjustment and maintenance or repair
work must only be performed by personnel authorized by WTW. Depending on
the severity, contravention can lead to loss of warranty.
−If safe operation is no longer possible, the equipment must be taken out of
service and secured against inadvertent operation by labeling with warning
signs.
−The safety of the user can be affected by the instrument if, for example,
•the instrument is visibly damaged,
•the instrument no longer operates as prescribed,
•the instrument has been stored under adverse conditions for a
lengthy period of time,
•the instrument was exposed to adverse transport conditions.
Basically, if you are in any doubt, please return the instrument for repair or
maintenance to the manufacturer of the equipment,
"Wissenschaftlich-Technische-Werkstätten GmbH".

pH 170/
pH 296
Contents
94
Safety instructions ................................................................................................ 93
Description ............................................................................................................. 97
Front views .............................................................................................................. 97
Control panel ........................................................................................................... 98
Display ................................................................................................................ 98
Display messages ............................................................................................... 99
Keyboard ........................................................................................................... 101
Operating instructions ....................................................................................... 101
Operating levels .................................................................................................... 102
Installation ........................................................................................................... 104
General instructions .............................................................................................. 104
Power supply ......................................................................................................... 104
"SENS-CHECK" connection ................................................................................... 105
REC 1 / REC 2 connections .................................................................................. 105
K1 / K2 (relay contacts) ......................................................................................... 105
RS 485 digital interace (RS option) ....................................................................... 106
Extension of cable between sensor and monitor ................................................... 106
Installation instructions for the pH 170 .................................................................. 107
Terminal assignment ......................................................................................... 107
Connecting the SenoLyt 650.............................................................................. 109
Connecting the SenoLyt 690 or SensoLyt 700 .................................................. 111
Connecting a high-resistance probe with external temperature probe
(Example: NTC / PT 100 / PT 1000) .................................................................. 112
Connecting a InPro®4250 (high-resistance) ...................................................... 113
Installation instructions for the pH 296 .................................................................. 114
Terminal assignment ......................................................................................... 114
Connecting the SenoLyt 650.............................................................................. 115
Connecting the SensoLyt 690 or SensoLyt 700 ................................................ 116
Connecting a high-resistance probe with external temperature probe
(Example: NTC / PT 100 / PT 1000) ...................................................................118
Connecting a InPro®4250 (high-resistance) ...................................................... 119

Contents
pH 170/
pH 296
95
Configuration......................................................................................................... 120
Factory settings ..................................................................................................... 120
Calling up the configuration level .......................................................................... 121
Overview table of the submenus ...................................................................... 122
Selecting the measuring mode .............................................................................. 122
Selecting the calibrating procedure ....................................................................... 123
Selecting the temperature compensation .............................................................. 124
Selecting the sensor .............................................................................................. 125
Selecting the REC 1 recorder output .................................................................... 126
Selecting the REC 2 recorder output .................................................................... 128
Relay 1/Relay 2 (R option) .................................................................................... 130
Selecting the relay functions.............................................................................. 130
Limit indicator (UL.LL) ................................................................................ 131
Pulse regulator (PI) ........................................................................................... 132
Frequency regulator (PF) ................................................................................. 134
Proportional band, Xp ....................................................................................... 136
Setting procedure for pulse or frequency regulation ......................................... 137
Selecting the switching direction (opener / closer) for FrC, UL.LL .................... 137
Parameterization ................................................................................................. 138
Factory settings ..................................................................................................... 138
Calling up the parameterization level .................................................................... 139
Calling up the parameterization level from the measuring mode ...................... 139
Calling up the parameterization level from the configuration mode .................. 139
Overview table of the submenus ...................................................................... 140
REC 1 and REC 2 recorder outputs (REC 2 only T option) .................................. 141
Relay 1 / Relay 2 (R option) .................................................................................. 142
Limit indicator (UL.LL) ............................................................................................ 142
Setting the parameters for limit indicators ........................................................ 143
Pulse regulator / Frequency regulator.................................................................... 145
Parameters for the pulse regulator / frequency regulator ................................. 146
RS 485 interface (RS option) ................................................................................ 147
Setting up the code ............................................................................................... 147
Redox shift ............................................................................................................ 150
Temperature input in manual temperature compensation ..................................... 151
Temperature compensation .................................................................................. 152
Timer for an external probe cleaning unit (CS) ..................................................... 153
Setting the intervals ............................................................................................... 154

pH 170/
pH 296
Contents
96
Viewing mode ...................................................................................................... 155
Displaying the parameterization and configuration data ....................................... 155
Displaying the calibration data and software version ........................................ 155
Measuring mode .................................................................................................. 156
Calibration ............................................................................................................ 157
Calling up the calibrating mode ............................................................................. 157
AutoCal TEC and AutoCal TEC calibrating procedures with buffer output .............157
Calibration error, CAL Err ................................................................................... 159
AutoCal TEC with buffer value .......................................................................... 160
Calibration using any buffer solutions: "ConCal" ....................................................161
Setting up the offset voltage ("Asymmetry" ASY) ............................................. 162
Setting up the measuring chain slope ............................................................... 163
Calibrating errors .............................................................................................. 164
Checking mode .................................................................................................... 165
Calling up the checking mode ............................................................................... 165
Displaying the code number ...................................................................................165
Recorder output 1 .................................................................................................. 166
Recorder output 2 ...................................................................................................166
Relay test ...............................................................................................................167
RS 485 ...................................................................................................................167
Flowchart ................................................................................................................168
Cleaning and maintenance ................................................................................. 169
Troubleshooting .................................................................................................. 170
Technical data ..................................................................................................... 171
Technical data for pH 170 ..................................................................................... 171
Technical data for pH 296 ..................................................................................... 174
Appendix: Folded pages Configuration and Parameterization

Description
pH 170/
pH 296
97
Front views
pH 170
pH 170
pH 296
pH 296

pH 170/
pH 296
Description
98
Control panel
Display
pH measuring mode Calibration: AutoRead “Active “
Slope/ Measuring chain Relay 1 is active (flashes if check
(PI, PF) is active)
Alphanumeric display:
measured value, slope, asymmetry,
user interface
Calibration procedure with technical
buffers selected
Dimensions:
mV (Redox), mV/pH (slope)
Calibration mode
Alarm display if sensor is defective Automatic calibration selected
Dimension: °C Alphanumeric display:
temperature, configuration parameters
Configuration of temperature
compensation
IDENT no./RS 485 operation
Relay 2 is active (flashes if check
(PI, PF) is active)
BAUD rate/RS 485 interface

Description
pH 170/
pH 296
99
Display messages
Note:
The first letter of a display message is used for allocation.
Configuration displays have a “C” as the first letter and a "P" identifies displays of
the parameterization.
Configuration:
CO COnfiguration
CFU Configuration FUnction
CCL Configuration CaLibration
Configuration temperature compensation
Cin Configuration Input
Cr1 Configuration recorder 1
Cr2 Configuration recorder 2
Configuration relay configuration
CrF Configuration relay Function
Parameterization:
PA PArametration
Pr1 Parametration recorder 1
Pr2 Parametration recorder 2
PL Parametration Limits
PIF Parametration InterFace
Prd Parametration redox
Ptc Parametration temperature compensation
PCd Parametration Code
Pt Parametration temperature
PCS Parametration Cleaning System
Viewing Mode:
Softwareversion

pH 170/
pH 296
Description
100
General:
690 SensoLyt®690
700 SensoLyt®700
oth other Probes
100 Pt100
1000 Pt1000
ntc ntc
nF no Function
PS Power Supply
FrC Freeze Contact
UL Upper Limit
LL Lower Limit
PI Proportional Impulse
PF Proportional Frequency
CClose
OOpen
Pro Proportional band
tI time Intervall
tF time Frequency
HS HySteresis
td time delay
Prn Printmodus
Sl Slavemodus
Checking Mode:
Cod Codenumber
tstreC1 teSt rECorder 1
tstreC2 teSt rECorder 2
tstreL teSt rELay
tst485 teSt Interface RS485
Digital interface option RS
Display messages see separate opering manual RA 485

Description
pH 170/
pH 296
101
Keyboard
•Operating keys to switch between Measurement (M) and Calibration (C)
•Function keys to switch between the operating levels and changing of setting
values in configuration and parameterization.
Operating instructions
The user interface is partly implemented via a "compelled guidance", i.e. all menus
with direct dependence must be passed through. A Code enables access to the
submenus, PA (Parameterization) and C0 (Configuration) (see section
"Configuration" and "Parameterization").
Select between C0 and PA using the keys or
Change to the next submenu:
Select the required setting: or
Accept the setting:
Return to the program start:
(except under compelled guidance)
or to the last submenu:
Return to the "Measure/Calibrate" function - if no compelled
guidance is present:
ESCAPE
to leave a menu
ENTER
to confirm the input
UP
to increase a value or to scroll
upwards in scrolling mode
DOWN
to decrease a value or to scroll
downwards in scrolling mode

pH 170/
pH 296
Description
102
Operating levels
The instrument functions are incorporated in three levels consecutively structured
to ensure a clear and transparent structure.
This structure ensures that the user is provided with an instrument that, although it
has universal options, can still be set so that unauthorized actions do not interfere
with the reliable measuring mode.
Operating level:
The configuration and parameterization can be interrogated in the operating level
without having to enter a code while the measuring mode continues to run.
However, the settings cannot be changed. The Measure and Calibrate operating
modes can be selected without any access restrictions.
Parameterization level:
The measuring ranges, limiting values, etc. are entered here. Access is protected
by a code.
Configuration level:
The functions of the monitor are allocated in this level.
The configuration is performed after the installation of the instrument, mainly on the
initial commissioning. Access is also protected by a code.

Description
pH 170/
pH 296
103
Note:
After a power fail, the instrument returns to the previous operating mode.
All settings are preserved.

pH 170/
pH 296
Installation
104
General instructions
•Instruments to be installed in the field (pH 170) must be equipped with a
protective cover (see WTW accessories).
•After installing the pH 170, close the cover to ensure compliance with the
IP66 standard.
•Inputs/outputs require no additional lightning protection.
The measures required for lightning protection are already incorporated in the
monitor and any existing lightning protection measures can be used in addition.
•The PG screws of the pH 170 are designed for cable diameters of 10 to
14 mm.
Unused cable feed-throughs (PG screws) are equipped with a sealing plug to
ensure compliance with the IP66 standard.
Power supply
Only allow qualified electricians to perform the installation as it
involves a line voltage that could endanger life.
A bipolar disconnection option between instrument and mains is
provided (e.g. a fuse)!
Depending on the version, the instruments are designed for 230 VAC, 115 VAC,
24 VAC or 24 VDC. The line voltage is printed on the nameplate. Always check
that the correct line voltage is applied before commissioning the instrument.
An incorrect line voltage can result in damage to the
instrument!
In instruments with a 24 VDC module, observe the following:
Only operate instruments with a voltage source that fulfills the requirements for
SELV (Safety Extra Low Voltage with enhanced insulation against dangerous
voltages) in accordance with EN 60950.
Without an interface, the requirements should fulfill EN 61010-1.
All instruments of the "170/296" series are constructed in accordance with safety
class II, i.e. no protective earth conductor is required.
Do not feed the protective earth conductor into the instrument or
connect it to an instrument terminal or to a supply line!
Only authorized WTW technicians are allowed to change the
instrument fuse.

Installation
pH 170/
pH 296
105
"SENS-CHECK" connection
The "SENS-CHECK" relay is designed as a closing contact that is electrically
isolated from the instrument; it is then always active (= closed) if a sensor error
occurs.
This message is also output on the display.
Sensor errors in the switching station are displayed using the relay.
Note:
The relay contact should only be loaded with a maximum of 250 VAC / 5A up to a
maximum of 150 W.
REC 1 / REC 2 connections
The REC 1 (pH/mV) and REC 2 (temperature) current outputs can be configured
as follows:
•0 to 20 mA
•4 to 20 mA
If terminals with a common earth are used, ensure the exact polarity of the direction
of the current flow (+ / – ). It involves active current sources that require no external
current source!
Do not use an external current source as this can lead to
malfunction of the current outputs!
Maximum load of 600 Ohm.
K1 / K2 (relay contacts)
The K1 and K2 relay contacts are designed as potential-free closers (make
contacts).
These contacts can also be configured as openers (break contacts) via the
configuration level. The assignment of the relay to the corresponding functions is
undertaken by the software configuration.
Note:
The contacts are designed for 250 VAC / 5A with, however, a maximum of 150 W.

pH 170/
pH 296
Installation
106
RS 485 digital interface (RS option)
The RS 485 interface operates with differential levels that are not susceptible to
interference. In this way, cable lengths of up to 1 km long can be implemented. The
instruments are connected via a 2-wire line. A twisted 3-wire line is recommended
for greater lengths or a larger number of instruments; the third line is used as a
reference potential (GND), to compensate for any possible differences in potential
that occur.
Terminate every bus with a resistor using the software (see Parameterizing).
The last device on the bus must provide the terminating resistor, i.e. in
parameterizing in the menu item PIF, the last device must have the termination
connected additionally within the bus connection (tr = termination) and
disconnected (notr = no termination) in all other devices.
If only one device is used, this is also effectively the last device and the terminating
resistor must be connected (tr).
All other technical data and operating instructions are given in RS 485
Operating Manual.
USA and Canada:
Use the MCB 17x conduit box for the power supply and relay/alarm
contacts. Follow the installation instructions.
Extension of cable between sensor and monitor
In order to extend the cable between sensor and monitor following junction boxes
can be used:
KI/S passive junction box
KI/pH 170 junction box KI/pH 170 with integrated impedance converter
for high impedance pH electrodes
The maximum distance between the sensor and the monitor, including the length of
the integral sensor cable, is 330 feet.

Installation pH 170
107
Installation instructions for the pH 170
A sensor can be connected to the measuring transmitter via the sensor input
socket or the terminal strip.
Set the connection location with the dip switch on the circuit board of the pH 170:
Connection of the sensor Dip switch
Terminal strip ON
Sensor input socket OFF
Terminal assignment
-
-
+
+
-
-
i
i
h
h
g
g
f
f
e
e
d
d
c
c
b
b
a
a
Rec2
Rec2
L1
L1
N
N
RS
RS
Option
Option
Sensor/Probe
Sensor/Probe
Rec1
Rec1
Netz
Mains
Netz
Mains
c
c
Option
Option
b
b
a
a
+
+
K2
K2
K1
K1
X2
X2
X1
X1
13
13
12
12
11
11
11
11
10
10
10
10
9
9
9
9
8
8
8
8
7
7
7
7
6
6
6
6
5
5
5
5
4
4
4
4
3
3
3
3
2
2
2
2
1
1
1
1
Dip switch
ON
Unused wires must not jut into the housing. Otherwise,
malfunctions can occur. This especially applies to the ground wire
of the mains cable. Cut off unused wires in the housing as close to
the armored thread joint as possible.

Installation pH 170
108
Terminal Terminal assignment
X1 X2
1 A (RS 485 option) REC 1 +
2 B (RS 485 option) REC 1 –
3 GND (RS 485 option) REC 2 +
4 Sens-Check REC 2 –
5 Sens-Check a (sensor)
6 K1 (R option) b (sensor)
7 K1 (R option) c (sensor)
8 K2 (R option) d (sensor)
9 K2 (R option) e (sensor)
10 N (mains) f (sensor)
11 L1 (mains) g (sensor)
12 –h (sensor)
13 –i (sensor)
Note:
For power supplies above 24 VDC, use the following wiring:
L1+ 24 V
N GND

Installation pH 170
109
Connecting the SensoLyt 650
The Dip switch must be in the “ON“position.
12 11 10 8
brown
yellow + green
transparent
white
c
b
a L1N
RS
Option Netz
Mains
Option
K2 K1
X1
13 12 11 11 10 10
99
88 77
66
55 44
33 22
11
Dip switch
ON
green
brown
yellow+
transparent
white
Unused wires must not jut into the housing. Otherwise,
malfunctions can occur. This especially applies to the ground wire
of the mains cable.
Cut off unused wires in the housing as close to the armored thread
joint as possible.

Installation pH 170
110
Terminal Terminal assignment
X1 X2
1 A (RS 485 option) REC 1 +
2 B (RS 485 option) REC 1 –
3 GND (RS 485 option) REC 2 +
4 Sens-Check REC 2 –
5 Sens-Check –
6 K1 (R option) –
7 K1 (R option) –
8 K2 (R option) white
9 K2 (R option) –
10 N (mains) brown
11 L1 (mains) yellow + green
12 –transparent
13 ––