WTW pH 170, pH 296 Instruction Manual

Operating Manual

pH / Redox Monitors

pH 170 pH 296

pH 170

pH 296

BA14105E/07.00/AS/pH170-296_4

General informations

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 2000, WTW GmbH

Reprinting – even in the form of excerpts – is only allowed with the explicit written authorization of WTW GmbH, Weilheim.

Printed in Germany.

106

Safety Instructions		S+
		S+

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".

107

S+
	Contents
S+
Safety instructions ..............................................................................................		107
Description ...........................................................................................................		111
Front views ............................................................................................................		111
Control panel .........................................................................................................		112
Display ..............................................................................................................		112
Display messages .............................................................................................		113
Keyboard ...........................................................................................................		115
Operating instructions .......................................................................................		115
Operating levels .....................................................................................................		116
Installation ...........................................................................................................		116
General instructions ...............................................................................................		116
Power supply .........................................................................................................		116
"SENS-CHECK" connection ...................................................................................		117
REC 1 / REC 2 connections ..................................................................................		117
K1 / K2 (relay contacts) .........................................................................................		117
RS 485 digital interace (RS option) .......................................................................		118
Installation instructions for the pH 170 ..................................................................		119
Terminal assignment .........................................................................................		119
Connecting the SenoLyt 650..............................................................................		121
Connecting the SenoLyt 690 or SensoLyt 700...................................................		123
Connecting other sensors .................................................................................		124
Connecting other sensors with an external temperature sensore ......................		125
Connecting a high-resistance probe with external temperature probe
(Example: NTC) .................................................................................................		126
Connecting a high-resistance probe with external temperature probe
(Example: PT 100 / PT 1000) ............................................................................		127
Connecting a InPro® 4200..................................................................................		128
Connecting the KI/pH 170 terminal box .............................................................		129
Connecting the KI/S terminal box ......................................................................		131
Wiring of KI/S .....................................................................................................		132
Connecting the KI/S connection box to the LF 170 using the K 160
plug and EK/AG cable........................................................................................		133
Installation instructions for the pH 296 ..................................................................		134
Terminal assignment .........................................................................................		134
Connecting the SenoLyt 650..............................................................................		136
Connecting the SensoLyt 690 or SensoLyt 700 ................................................		138
Connecting measuring chains with an external temperature sensor .................		140
Connecting a InPro® 4200..................................................................................		142
Connecting the terminal box KI/pH 170 .............................................................		143

108

	S+
Contents
	S+
Connecting the KI/S terminal box ......................................................................	145
Wiring of KI/S.....................................................................................................	147
Configuration.........................................................................................................	148
Factory settings .....................................................................................................	148
Calling up the configuration level ..........................................................................	149
Overview table of the submenus ......................................................................	150
Selecting the measuring mode ..............................................................................	150
Selecting the calibrating procedure .......................................................................	151
Selecting the temperature compensation ..............................................................	152
Selecting the sensor ..............................................................................................	153
Selecting the REC 1 recorder output .....................................................................	154
Selecting the REC 2 recorder output .....................................................................	156
Relay 1/Relay 2 (R option) ....................................................................................	158
Selecting the relay functions..............................................................................	158
Limit indicator (UL.LL) ................................................................................	159
Pulse regulator (PI) ...........................................................................................	160
Frequency regulator (PF) ..................................................................................	162
Proportional band, Xp .......................................................................................	164
Setting procedure for pulse or frequency regulation .........................................	165
Selecting the switching direction (opener / closer) for FrC, UL.LL.....................	165
Parameterization .................................................................................................	166
Factory settings .....................................................................................................	166
Calling up the parameterization level ....................................................................	167
Calling up the parameterization level from the measuring mode ......................	167
Calling up the parameterization level from the configuration mode	.................. 167
Overview table of the submenus ......................................................................	168
REC 1 and REC 2 recorder outputs (REC 2 only T option) ...................................	169
Relay 1 / Relay 2 (R option) ..................................................................................	170
Limit indicator (UL.LL) ............................................................................................	170
Setting the parameters for limit indicators ........................................................	171
Pulse regulator / Frequency regulator....................................................................	173
Parameters for the pulse regulator / frequency regulator .................................	174
RS 485 interface (RS option) ................................................................................	177
Setting up the code ...............................................................................................	177
Redox shift ............................................................................................................	178
Temperature input in manual temperature compensation .....................................	179
Temperature compensation ..................................................................................	180

109

S+
	Contents
S+
Viewing mode ......................................................................................................		181
Displaying the parameterization and configuration data ........................................		181
Displaying the calibration data and software version ........................................		181
Measuring mode ..................................................................................................		182
Calibration ............................................................................................................		183
Calling up the calibrating mode .............................................................................		183
AutoCal TEC and AutoCal TEC calibrating procedures with buffer output .............		183
Calibration error, / )) ...................................................................................		185
AutoCal TEC with buffer value ..........................................................................		186
Calibration using any buffer solutions: "ConCal" ....................................................		187
Setting up the offset voltage ("Asymmetry" ASY) ..............................................		188
Setting up the measuring chain slope ...............................................................		189
Calibrating errors ..............................................................................................		190
Checking mode ....................................................................................................		191
Calling up the checking mode ...............................................................................		191
Displaying the code number ...................................................................................		191
Recorder output 1 ..................................................................................................		192
Recorder output 2 ...................................................................................................		192
Relay test ................................................................................................................		193
RS 485 ...................................................................................................................		193
Flowchart ................................................................................................................		194
Cleaning and maintenance .................................................................................		195
Troubleshooting ..................................................................................................		196
Technical data .....................................................................................................		197
Technical data for pH 170 .....................................................................................		197
Technical data for pH 296 .....................................................................................		200

Appendix: Folded pages Configuration and Parameterization

110

Description		S+
		S+

Front views

pH 170

S+

pH 296

pH 296

111

S+

S+

Control panel

Display

pH measuring mode

Slope/ Measuring chain

Alphanumeric display:

measured value, slope, asymmetry, user interface

Dimensions:

mV (Redox), mV/pH (slope)

Alarm display if sensor is defective

Dimension: °C

Configuration of temperature compensation

Relay 2 is active (flashes if check (- , - ) is active)

Description

Calibration: AutoRead “Active “

Relay 1 is active (flashes if check (- , - ) is active)

Calibration procedure with technical buffers selected

Calibration mode

Automatic calibration selected

Alphanumeric display:

temperature, configuration parameters

IDENT no./RS 485 operation

BAUD rate/RS 485 interface

112

Description		S+
		S+

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:

I	COnfiguration
6	Configuration FUnction
/	Configuration CaLibration
	Configuration temperature compensation
='	Configuration Input
)	Configuration recorder 1
)	Configuration recorder 2
	Configuration relay configuration
)	Configuration relay Function

Parameterization:

-	PArametration
-)	Parametration recorder 1
-)	Parametration recorder 2
-/	Parametration Limits
-	Parametration InterFace
-)&	Parametration redox
-*8	Parametration temperature compensation
- &	Parametration Code
-*	Parametration temperature

Viewing Mode:

Softwareversion

113

S+		Description
S+

General:

(*<

'*8 ' -) 6/

//

- -

I -)( * *

*& -)',

SensoLyt®690

SensoLyt®700

other Probes

Pt100 Pt1000 ntc

no Function

Power Supply

Freeze Contact

Upper Limit

Lower Limit

Proportional Impulse

Proportional Frequency

Close

Open

Proportional band time Intervall time Frequency

HySteresis time delay Printmodus

Slavemodus

Checking Mode:

(&	Codenumber
*@*)9	teSt rECorder 1
*@*)9	teSt rECorder 2
*@*)9/	teSt	rELay
*@*	teSt	Interface RS485

Digital interface option RS

Display messages see separate opering manual RA 485

114

Description		S+
		S+

Keyboard

œ

œ

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.

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83

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(17(5

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GRZQZDUGV LQ VFUROOLQJ PRGH

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, - (Parameterization) and (Configuration) (see section "Configuration" and "Parameterization").

Select between and - 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:

115

S+		Description
S+

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.

116

Description

S+

S+

Note:

After a power fail, the instrument returns to the previous operating mode. All settings are preserved.

117

S+		Installation
S+

General instructions

œ Instruments to be installed in the field (pH 170) must be equipped with a protective cover (see WTW accessories).

œ After installing the pH 170, close the cover to ensure compliance with the IP66 standard.

œ 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.

œ 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.

116

	Installation		S+
			S+
	"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:

œ 0 to 20 mA

œ 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.

117

S+		Installation
S+

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 - , the last device must have the termination connected additionally within the bus connection (*) = termination) and disconnected ('(*) = 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 (*)).

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.

118

Installation pH 170

Installation instructions for the pH 170

Terminal assignment

	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.

119

Installation pH 170

	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

120

Installation pH 170

Connecting the SensoLyt 650

If a SensoLyt 650 is used, the Dip switch on the circuit board of the 170 must be in the “ON“ position.

12 11 10 9 8

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<![if ! IE]> <![endif]>brown

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ON

Dipschalter

13 12	11 10 9	8	7	6	5	4	3	2	1	1	2	3	4	5	6	7	8	9	10 11
										a b		c				K1	K2		N L1
											RS								Netz
										Option					Option				Mains
<![if ! IE]> <![endif]>transparent	<![if ! IE]> <![endif]>yellow/green brown														X1
		<![if ! IE]> <![endif]>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.

121

Installation pH 170

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		–	–

122

Installation pH 170

Connecting the SensoLyt 690 or SensoLyt 700

pH 170
pH	714
	141	°C	TP
M		C

The dip switch on the circuit board of the 170 must be in the "OFF" position.

OFF

Dip switch

13 12	11 10 9	8	7	6	5	4	3	2	1	1	2	3	4	5	6	7	8	9	10 11
										a b		c				K1	K2		N L1
											RS								Netz
										Option					Option				Mains

X1

123

Installation pH 170

Connecting other sensors

pH 170
pH	714
	141	°C	TP
M		C

ADA pH 171

AS7-S

Example:

InTrac 777-M

The dip switch on the circuit board of the 170 must be in the "OFF" position.

OFF

Dip switch

13 12	11 10 9	8	7	6	5	4	3	2	1	1	2	3	4	5	6	7	8	9	10 11
										a b		c				K1	K2		N L1
											RS								Netz
										Option					Option				Mains

X1

124

Installation pH 170

Connecting other sensors with an external temperature sensor

pH 170
pH	714
	141	°C	TP
M		C
ADA pH 171

3-wire connection:

13 12

11 10 9

8

7

6

5

4

3

2

1

PT 100

PT 1000

2-wire connection:

13 12 11 10 9 8 7 6 5 4 3 2 1

		NTC
				The Dip switch on the circuit board of
				the 170 must be in the "OFF" postion.
	For example:
	Pt 100
InTrac 777-M	Pt 1000
	NTC	OFF
		Dipschalter
		13 12	11 10 9	8	7	6	5	4	3	2	1	1	2	3	4	5	6	7	8	9	10 11
												a b		c				K1	K2		N L1
													RS								Netz
												Option					Option				Mains

X1

125

Installation pH 170

Connecting a high-resistance probe with external temperature probe (Example: NTC)

The Dip switch must be in the “ON“ position.

13 12 11 10 9 8 7 6 5

Sensor/Probe

i h g f e d c b a

X2

4 3 2 1

Rec2 Rec1

+-+-

1		2	3			4	5	6	7	8	9	10 11
a b			c					K1		K2		N L1
		RS										Netz
	Option							Option				Mains
								X1

NTC

Shield

For example:

SensoLyt SE

When installing a high-resistance probe, ensure that no cable makes contact with the terminal strips between the plugs

11 and 12!

126

Installation pH 170

Connecting a high-resistance probe with external temperature probe (Example: PT 100 / PT 1000)

The Dip switch must be in the “ON“ position.

13 12	11 10 9	8	7	6	5	4	3	2	1
	Sensor/Probe					Rec2		Rec1
i h g f e		d c		b a		-	+	-	+

X2

NTC

Shield

1		2	3			4	5	6	7	8	9	10 11
a b			c					K1		K2		N L1
		RS										Netz
	Option							Option				Mains
								X1

For example:

SensoLyt SE

When installing a high-resistance probe, ensure that no cable makes contact with the terminal strips between the plugs

11 and 12!

127

Installation pH 170

Connecting a InPro® 4200

ON

Dip switch

			13 12	11 10 9	8	7	6	5	4	3	2	1	1	2	3	4	5	6	7	8	9	10 11
													a	b	c				K1	K2		N L1
														RS								Netz
													Option					Option				Mains
			<![if ! IE]> <![endif]>transparent	<![if ! IE]> <![endif]>Copperand yellow/green green gray	<![if ! IE]> <![endif]>white													X1
12	11	10 9	8

<![if ! IE]> <![endif]>Copperand yellow/green

<![if ! IE]> <![endif]>green

<![if ! IE]> <![endif]>transparent

<![if ! IE]> <![endif]>gray

<![if ! IE]> <![endif]>white

Terminal

Terminal assignment

X1

X2

1

A (RS 485)

REC 1 +

2

B (RS 485)

REC 1 –

3

GND (RS 485)

REC 2 +

4

Sens-Check

REC 2 –

5

Sens-Check

–

6

Relay 1

–

7

Relay 1

–

8

Relay 2

white

9

Relay 2

gray

10

N (mains)

green

11

L1 (mains)

copper and yellow/green

12

–

transparent

13

–

–

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.

128

Installation pH 170

Connecting the KI/pH 170 terminal box

When using a KI/pH 170, the dip switch of the 170 on the PCB must be set to the “ON“ setting.

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	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.

129

Installation pH 170

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	pink
6		K1 (R option)	white
7		K1 (R option)	blue
8		K2 (R option)	brown
9		K2 (R option)	red
10		N (mains)	green
11		L1 (mains)	gray + screen
12		–	yellow
13		–	–

130

Installation pH 170

Connecting the KI/S terminal box

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131

Installation pH 170

Wiring of KI/S

Strip terminal	Colour of wires
1	yellow
2	gray+ shield
3	pink
4	blue
5	brown
6	green
7	white

Note:

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.

After connection of the 8-wire EK 170 cable, the 8th wire remains unused.The unused wire should be fixed in position or pinched off.

132