Isotech TTI 7 PLUS Operating instructions

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TRUE TEMPERATURE
INDICATOR MODEL TTI 7PLUS
User Maintenance Manual/Handbook
Isothermal Technology Limited, Pine Grove, Southport, PR9 9AG, England
Tel: [phone] Fax: [phone] Internet: www.isotech.co.uk E-mail: [e-mail]
The company is always willing to give technical advice and assistance where appropriate. Equally, because of the programme of continual
development and improvement we reserve the right to amend or alter characteristics and design without prior notice. This publication is for
information only.

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CONTENTS
GUARANTEE................................................................................................................................................................ 4
EMC INFORMATION .................................................................................................................................................. 5
ELECTRICAL SAFETY .................................................................................................................................................. 5
Environmental Ratings .......................................................................................................................................... 5
OPERATING INSTRUCTIONS: SOFTWARE VERSION 7.1 ....................................................................................... 6
SUPPLIED ACCESSORIES ........................................................................................................................................ 6
SAFETY ..................................................................................................................................................................... 6
CE MARKING ........................................................................................................................................................... 6
INSTALLATION ....................................................................................................................................................... 6
MAINTENANCE ...................................................................................................................................................... 6
Batteries................................................................................................................................................................ 7
Technical Specification ......................................................................................................................................... 7
UNCERTAINTY OF MEASUREMENT..................................................................................................................... 8
GENERAL ................................................................................................................................................................. 9
FRONT PANEL KEYS............................................................................................................................................... 9
Data Logging....................................................................................................................................................... 14
RTD INPUTS .......................................................................................................................................................... 16
PROBE CONNECTION......................................................................................................................................... 16
THERMOCOUPLE INPUTS................................................................................................................................... 16
CALIBRATION ....................................................................................................................................................... 17
RTD Calibration ................................................................................................................................................. 17
Thermocouple Calibration ................................................................................................................................. 17
RJ Calibration...................................................................................................................................................... 18
Equipment Required........................................................................................................................................... 18
Environment ....................................................................................................................................................... 18
CAL NOTEPAD.......................................................................................................................................................... 19
MINIMUM SYSTEM REQUIREMENTS................................................................................................................... 19
Development ...................................................................................................................................................... 19
License ................................................................................................................................................................ 19
INSTALLING CAL NOTEPAD ............................................................................................................................... 19
STARTING CAL NOTEPAD .................................................................................................................................. 20
Configuring for the TTI 7PLUS ............................................................................................................................. 20
REMOTE CONTROL INTERFACES .......................................................................................................................... 21
INTRODUCTION .................................................................................................................................................. 21
Version History................................................................................................................................................... 21
RS-232 SERIAL INTERFACE ................................................................................................................................... 21
Connection ......................................................................................................................................................... 21
Front Panel Set Up ............................................................................................................................................. 22
Talk Only Mode.................................................................................................................................................. 22
Baud Rate............................................................................................................................................................ 22
Communicating .................................................................................................................................................. 22
PROGRAMMING THE INTERFACE ...................................................................................................................... 23
Introduction ........................................................................................................................................................ 23
Command Tree .................................................................................................................................................. 23
Data Types.......................................................................................................................................................... 24
Output Data Format .......................................................................................................................................... 24
Input Message Terminators................................................................................................................................ 24
Input Buffer......................................................................................................................................................... 25
Measurement Configuration Commands........................................................................................................... 25
Triggering Commands........................................................................................................................................ 27
Routing Commands ............................................................................................................................................ 30
Memory Commands........................................................................................................................................... 30
Datalogger Commands....................................................................................................................................... 31
Mathematical Operation Commands .................................................................................................................. 32
Autozero And Rolling Mean & Standard Deviation Commands ....................................................................... 33
System Related Commands................................................................................................................................ 33
Status Reporting Commands.............................................................................................................................. 35
Questionable Data Registers.............................................................................................................................. 37

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Standard Event Registers.................................................................................................................................... 37
Operation Registers............................................................................................................................................ 38
Status Byte Registers .......................................................................................................................................... 39
RS-232 Interface Commands ............................................................................................................................. 40
Front Panel Operations ...................................................................................................................................... 40
APPENDIX I: COMMAND SUMMARY.................................................................................................................. 41
Programming Language ...................................................................................................................................... 41
Measurement Configuration Commands........................................................................................................... 41
Triggering Commands........................................................................................................................................ 41
Routing Commands ............................................................................................................................................ 42
Memory Commands........................................................................................................................................... 42
Datalogger Commands....................................................................................................................................... 42
Mathematical Operation Commands................................................................................................................. 42
Autozero andp Rolling Mean & Standard Deviation Commands ...................................................................... 42
System Related Commands................................................................................................................................ 42
Status Reporting Commands.............................................................................................................................. 43
RS-232 Interface Commands ............................................................................................................................. 43
APPENDIX II: RS-232 PIN CONNECTIONS ........................................................................................................ 44

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GUARANTEE
This instrument has been manufactured to exacting standards and is guaranteed for twelve months against electrical
break-down or mechanical failure caused through defective material or workmanship, provided the failure is not the
result of misuse. In the event of failure covered by this guarantee, the instrument must be returned, carriage paid, to
the supplier for examination and will be replaced or repaired at our option.
FRAGILE CERAMIC AND/OR GLASS PARTS ARE NOT COVERED BY THIS GUARANTEE
INTERFERENCE WITH OR FAILURE TO PROPERLY MAINTAIN THIS INSTRUMENT MAY INVALIDATE THIS
GUARANTEE
RECOMMENDATION
The life of your ISOTECH Instrument will be prolonged if regular maintenance and cleaning to remove general dust
and debris is carried out.
We recommend that this instrument to be re-calibrated annually.
ISOTHERMAL TECHNOLOGY LTD.
PINE GROVE, SOUTHPORT
PR9 9AG, ENGLAND
TEL: [phone]/544611
FAX: [phone]
The company is always willing to give technical advice and assistance where appropriate. Equally, because of the
programme of continual development and improvement we reserve the right to amend or alter characteristics and
design without prior notice. This publication is for information only.

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EMC INFORMATION
This product meets the requirements of the European Directive on Electromagnetic Compatibility (EMC)
89/336/EEC as amended by EC Directive 92/31/EEC and the European Low Voltage Directive 73/25/EEC, amended
by 93/68/EEC. To ensure emission compliance please ensure that any serial communications connecting leads are
fully screened.
The product meets the susceptibility requirements of EN 50082-1, criterion B.
Symbol Identification
Publication
Description
ISO3864
Caution (refer to handbook)
IEC 417
Caution, Hot Surface
ELECTRICAL SAFETY
This equipment must be correctly earthed.
This equipment is a Class 1 Appliance. A protective earth is used to ensure the conductive parts can not become live
in the event of a failure of the insulation.
The protective conductor of the flexible mains cable which is coloured green/yellow MUST be connected to a
suitable earth.
The Blue conductor should be connected to Neutral and the Brown conductor to Live (Line).
Warning: Internal mains voltage hazard. Do not remove the panels.
There are no user serviceable parts inside. Contact your nearest Isotech agent for repair.
Voltage transients on the supply must not exceed 2.5kV.
Conductive pollution, e.g. Carbon dust, must be excluded from the apparatus. EN61010 pollution degree 2.
Environmental Ratings
Operating Temperature 0-50°C
Relative Humidity 5-95%, non condensing

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OPERATING INSTRUCTIONS: SOFTWARE VERSION 7.1
SUPPLIED ACCESSORIES
1 Mains Cord
1 RS 232 Cable
1 Operating Instructions (English)
When unpacked, inspect for physical damage and report any defects immediately in writing, retaining packaging
materials for inspection. Before placing into service, ensure mains voltage is correct. Instruments are normally
supplied for 240Volts 50Hz. Other voltages may also be selected according to the chart in the Maintenance section.
Be sure to also change the fuse to the correct type and rating.
SAFETY
This apparatus is designated Safety class 1 as defined in the IEC publication 1010-1 (Amendment 1).
CE MARKING
This apparatus complies with the CE marking directive, 93/68/EEC, and is in compliance with the following standards:
Generic Emission Standard EN5081-1
Conducted Emissions EN55022 Class B
Radiated Emissions EN55022 Class B
Generic Immunity Standard EN5082-1
Conducted Immunity (Power Lines) prEN60 1000-4-4 1kV
Conducted Immunity (Signal Lines) prEN60 1000-4-4 500V
Radiated Immunity prEN60 1000-4-3 3V/m
Electrostatic Discharge Immunity prEN60 1000-4-2 8kV
Electrical Safety Standard IEC1010-1 (Amend 1)
INSTALLATION
The TTI 7PLUS is designed to be either free bench-standing, or rack-mounted. The TTI 7PLUS is ½19", 2.5U high.
When connected to a mains supply, the mains cord provided with the equipment should be used, and connected only
to a mains supply with a suitable earth connection. Before connection to the mains supply ensure that the correct
voltage is set, and the fuse is of the correct rating.
MAINTENANCE
Normally no maintenance is required other than cleaning with a moist cloth. Avoid aggressive detergents or solvents.
CAUTION: Before any maintenance, repair, or exchange of parts or fuses, the instrument must be disconnected
from the mains supply and all other power sources. In the event of a fault occurring, the instrument should be
returned to our factory, or Agent, for rectification. A mains fuse is fitted to the mains inlet socket on the rear panel,
and should be replaced if necessary. The Instrument should only be serviced/repaired by a competent engineer and
only design approved replacement parts used.

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CAUTION: Disconnect the mains lead and all connecting leads, before removing the fuse holder. Replace only with
the correct fuse type, i.e. according to the following chart.
LINE Range Fuse (250V)
VOLTAGE Vac IEC 127
Selection 47-63Hz 5 x 20 mm
Maximum Input Power: 25VA
Batteries
The thermometers may be used either directly connected to the mains supply or, for portable applications, run from
the internal batteries. Approximately 8 hours continuous operation from a full charge is possible. The battery
charger is built into the instrument and charging commences immediately when the mains supply is connected,
illuminating the LINE LED on the front panel. The batteries used are of the sealed lead acid type; continuous trickle
charging causes no harm to the batteries and we always recommend running from the mains supply when possible,
thus ensuring the batteries are always fully charged and ready for portable applications. The charger will
automatically switch to trickle charge or fast charge mode depending upon the battery state.
LOW BATTERY indication is displayed when the batteries have approximately 10% charge left. When this indication
appears, the thermometers should be connected to a mains supply as soon as convenient, as approximately 50
minutes operating time remains. To extend the battery life, the backlight can be turned off via the OPT menu.
Operating time without backlight is approximately 14 hours.
Technical Specification
DISPLAY: LCD Graphics Panel, 240 x 64 dot, with LED backlight contrast control via front panel
keyboard.
INPUTS: 2 channels for PRTs via 6 pin Lemo sockets. LEMO type number for input plug:
FGG1B.306.CLAD52
IMPUT IMPEDENCE > 10M
Max. input Voltage 40Vdc, 28Vrms
Common Mode Rejection 50Vrms
The inputs are linearised and user selectable to the following standards:-
EN6071=100 Ohm, Ra=3908
USER: Up to 20 probes may be configured to customer entered constant, A B, C, and R0
values. For Industrial PRT (CVD) and ITS 90 coefficients for SPRT
A standby current is always passed through the sensors.
100V 90-110V} 630mA (T)
120V 108-132V}
220V 198-244V} 315mA (T)
240V 216-264V}

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UNCERTAINTY OF MEASUREMENT
The Inputs are linearised for the following thermocouple Types B,E,J,K,L,N,R,S,T,U,Au/Pt and in accordance with the following
Standard, NIST 175, ITS 90. Types C & D to ASTM E988, types L and U to DIN 43710.
Reference Junction compensation may be selected for the following modes:-
Automatic: Internal Reference Junction range 0 to +40C
External: Via Pt100 sensor connected to channel A or B range 0 to +100C
OFF: Turns the Reference Junction OFF = 0C
* Apply to readings above 600C
The above figures apply to values with Reference Junction switched off.
Reference Junction uncertainty when used in automatic mode (INT) is better than 0.1C at + 20C with a deviation
of typically 0.01C/C over the range 0 to 100C.
CALIBRATION: Digital security code protected. Default number set 9252
BATTERIES: 1 x Sealed Lead Acid Battery 6V 2.8AH to power digital circuit and display
1 x Sealed Lead acid Battery 6V 1.2 AH to power analogue circuit
1 x Lithium Battery T068AA for data logging memory
Operating time after full charge 8 hours with backlight, 14 hours without
backlight
WORKING 0…50°C rel. humidity less than 90% non condensing
SENSOR
RANGE °C
RESISTANCE
CURRENT
RESOLUTION °C, °F,
K
UNCERTAINTY @
20°C ±5°C
Pt25
-200 to -100
2.5 to 15
1 mA
0.001
0.02 °C
Pt25
-100 to +500
15 to 75
1 mA
0.001
0.01 °C
Pt25
+500 to +670
75 to 115
1 mA
0.001
0.02 °C
Pt100
-200 to -100
10 to 60
0.5 mA
0.001
0.02 °C
Pt100
-100 to +500
60 to 280
0.5 mA
0.001
0.01 °C
Pt100
+500 to +670
280 to 460
0.5 mA
0.001
0.02 °C
TYPE
RANGE
C
RESOLUTION
C F or K
DISPLAY
RESOLUTION
V
UNCERTAINTY
@ 20C 5C 1 YEAR
UNCERTAINTY
@ 20% 5C 60 Days
TEMPERATURE
COEFFICIENT /C
B
+250 to +1820
0.01
1.0
(0.025% Rdg + 0.006%FS) *
(0.02% Rdg + 0.006% FS) *
7 ppm Rdg + 6 ppm FS
C
0 to +2315
0.01
1.0
(0.075% Rdg + 0.005%FS)
(0.05% Rdg + 0.005% FS)
7 ppm Rdg + 6 ppm FS
D
0 to +2315
0.01
1.0
(0.075% Rdg + 0.005%FS)
(0.05% Rdg + 0.005% FS)
7 ppm Rdg + 6 ppm FS
E
-200 to +1000
0.01
1.0
(0.026% Rdg + 0.004%FS)
(0.01% Rdg + 0.004% FS)
7 ppm Rdg + 6 ppm FS
J
-210 to +1200
0.01
1.0
(0.03% Rdg + 0.005%FS)
(0.008% Rdg + 0.005% FS)
7 ppm Rdg + 6 ppm FS
K
-200 to +1372
0.01
1.0
(0.035% Rdg + 0.006%FS)
(0.01% Rdg + 0.006% FS)
7 ppm Rdg + 6 ppm FS
L
-200 to +500
0.01
1.0
(0.03% Rdg + 0.005%FS)
(0.008% Rdg + 0.005% FS)
7 ppm Rdg + 6 ppm FS
N
-200 to +1300
0.01
1.0
(0.035% Rdg + 0.005%FS)
(0.01% Rdg + 0.005% FS)
7 ppm Rdg + 6 ppm FS
R
-50 to +1768
0.01
1.0
(0.02% Rdg + 0.015%FS)
(0.005% Rdg + 0.015% FS)
7 ppm Rdg + 6 ppm FS
S
-50 to +1768
0.01
1.0
(0.02% Rdg + 0.015%FS)
(0.005% Rdg + 0.015% FS)
7 ppm Rdg + 6 ppm FS
T
-200 to + 400
0.01
1.0
(0.025% Rdg + 0.015%FS)
(0.005% Rdg + 0.015% FS)
7 ppm Rdg + 6 ppm FS
U
-200 to +600
0.01
1.0
(0.025% Rdg + 0.015%FS)
(0.005% Rdg + 0.015% FS)
7 ppm Rdg + 6 ppm FS
Au/Pt
0 to +1000
0.01
1.0
(0.02% Rdg + 0.015%FS)
(0.005% Rdg + 0.015% FS)
7 ppm Rdg + 6 ppm FS

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TEMPERATURE:
STORAGE -20…+55°C
TEMPERATURE:
MAINS SUPPLY: 100/120/220/240 Volts +10% -13%
47…63Hz. 80VA
DATA LOGGING: Up to 4000 single channel values may be stored with date and time.
MATHS: Computes Max/Min values, Mean values, peak to Peak values, and standard deviation. Values
all computed from values stored in log.
GENERAL
The TTI 7PLUS comes ready for immediate use, with rechargeable batteries and built-in charger.
The instruments are switched on and off using the left hand buttons, marked appropriately. Connecting the mains
cord automatically enables the battery charging circuit and charges the batteries at the required rate. The LED
marked "LINE" will illuminate to show that mains power has been connected to the thermometer, and the LED
marked "FAST" will light when the batteries are low and the charger is charging at a high rate. The charger will
automatically reduce the charging current to a trickle charge as the batteries reach approximately 80% of full
capacity. Continuous trickle charging will not affect the batteries, and we recommend that the TTI 7PLUS is used with
the mains supply connected whenever possible.
To measure temperature, a suitable probe should be connected to input A or B. The measured temperature will be
displayed in large units and the actual resistance or voltage measured will be displayed in smaller units below,
together with the measuring current mode selected. In addition, the probe configuration and channel details will be
displayed along the top of the display.
FRONT PANEL KEYS

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DISPLAY CONTRAST: To change this display contrast, press and hold down either the ↑or ↓key; the contrast
will vary and may be selected for optimum viewing. The contrast and the viewing angle are changeable, and it may
be desirable to alter the contrast from time to time as your reading position alters.
Aselects channel A to the display
B Selects channel B to the display
A-B Displays the difference between probe A and probe B
in this case the millivolt/resistance reading will not be shown.
SENS The following sensors may be configured.
Select SENS
To configure for thermocouples select T/C and the following screen will be displayed
Select from one of the thermocouple options and press OK the next screen will help you configure the reference
junction
From this screen you can choose from 3 Reference junction modes: Offswitches the RJ Off. Int selects the internal RJ
and automatically compensates displaying the true temperature. Ext switches to the external RJ mode, and a PRT
should be connected to the RTD input of the channel being configured; this Prt can then be used to accurately
measure the reference junction temperature. When selecting the Ext option a choice of Prt types is available.

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To configure the input for PRT input from the SENS screen, select PRT.
Select EN-60751 to select the Industrial PRT standard linearisation for Pt100, the coefficients may be reviewed by
pressing the Rev Key but cannot be changed.
To select other coefficients and to configure for Pt25 press the User key.
Enter the probe number and press OK if the probe number selected has already been configured, then press Quit to
return to the main measurement menu. If you select a probe number that has no coefficients assigned to it then you
will be prompted to enter the probe coefficients.
To enter probe coefficients a choice of either CvD (Calendar van Duesen) or ITS90 coefficients is available.
Select CvD and the coefficients should be entered in the following screen
Select ITS90 and the coefficients should be entered in the following screen

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Once a probe has been configured it can be recalled from the SENS menu and reconfigured if required using the Rev
option.
AN IMPORTANT feature of the TTI 7PLUS is that each channel may be configured with any sensor type so that RTD’s
may be compared against thermocouples. Pt25 against Pt100 etc.
UNIT This key changes the units of the temperature display, each key press will change the units to the next
available in the order C F K
RESN When the thermometer first powers up the display defaults to a resolution of 0, this
resolution can be increased to 0.01 and 0.001 by pressing the RESN key pressing again returns the resolution
to 0.
MATH Pressing the MATH key enables you to select and review the statistical values of stored data log values. Press
Log Stats and the following values will be displayed, Max and Min values, Mean value, Peak to peak value,
and Standard deviation. The number of samples these values are derived from is also displayed.
WARNING: STATS will only be calculated and displayed from values held in the log, and will only be displayed when
the stored log values are all for the same channel. If different channel readings have been stored the STATS is invalid.
It is also important to be aware that changing the probe characteristics settings during logging will invalidate any
STATS displayed.
A minimum of 2 readings in this log is required to complete the STATS.
SCAN Selecting this option enables the scanner to be configured and values logged.
Press SCAN this screen enables you to turn the scan sequence ON or OFF and to select one of the 4 available
scanning sequences SL1 to SL4; the scanning lists may also be edited.

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To select a scanning list pres SL1 to SL4, to turn off the scanning press Off. With the scanning list selected it is now
possible to edit the list press the Edt key
The channels included in the scanning sequence can now be selected by pressing the Add key or deleted with the Del
key; the highlighted channel will be added or deleted. To select a different channel use the <>keys NOTE: if
scanner cards are fitted then an additional 4 channels will be available per scanner card. Press OK to return to
previous screen.
From the SCAN main menu select TIMER to set the cycle and time intervals.
To select the parameter to change, use the < > keys and the selected parameter will flash. Press Clear to clear
current value set, and Edit to change the selected parameter.
To set the number of scan cycles press Edit and then key in the number of cycles required, 1 to 9999. To set as
continuous scan press Clear. Using the >key select Delay and Edit key in the required delay time between scans
hh:mm:ss this will also be the delay time before the first scan starts. Press OK to confirm set time and >to select the
reading rate. Press Edit and key in the reading rate hh:mm:ss this will be the time between each measurement.
Note: allow sufficient time for temperature to be measured and have regarding for stabilisation time of measured
sample. Press OK to confirm, and Quit to exit to main measurement screen
The thermometer is now set in the Hold mode and the scan sequence is started by pressing the TRIG key. A timer
will show in place of the Hold and will count down to the measurement scan start.

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Data Logging
To configure the data logging from the main measurement screen select SCAN and Mem
To set up a new log press New confirm that you wish to clear the current log and then press On to activate the
logging function press OK to confirm and Quit to return to measurement screen. The instrument will be in the
measurement hold state and to trigger the measurement start press the Trig key. All measured values will now be
stored in the Log. The logging function can be used in conjunction with canner sequences.
To review the logged values press SCAN and Rev
The values can be scrolled Up and Down using the Arrow keys
To exit this screen press OK (CAL ) key
“Hold Samples = 0/20 ”
ZERO This key zeros the displayed value and "Zero" appears in the bottom left hand corner of the display.
NOTE: The Zero offset will be cancelled if the measuring channel is changed, if the calibration menu is
entered, or if the sensor configuration is changed.
TRIG The TRIG key operates in two modes. These may be set using the OPT menu. The default mode
enables the TRIG key to be used as a run/hold button, and Run appears on the display above the key.
Pressing TRIG holds the display, and Hold will appear on the display. It will also be noticed that the
flashing "Busy" blanks in the hold mode. Pressing TRIG a second time returns the instrument to the run
mode. The second mode of operation may be set using the OPT menu. This enables the TRIG key to
be set in single shot mode, i.e. when pressing the TRIG key one measurement is made and held on the
display, and the busy sign flashes once. It should also be noted that even for large changes in
temperature readings the new measurement will be valid, the specially designed measurement circuit
ensures that the A/D converter is fully zeroed and stabilised before a new measurement is displayed.
When used in conjunction with the data logging function, the TRIG key is used to start the logging.
Pressing the TRIG key again puts the instrument into a hold state and the measurement channels may
now be changed. Restarting the measurement by pressing the TRIG key also resumes the data logging;
the newly selected measurement channel now being stored. It is possible to store readings from
channels A, B, or A-B. When in single measurement mode the instrument is normally in the hold state.
Pressing the TRIG key initiates one measurement which will be stored in the log, the instrument then
returns to the hold state.
+I This selects the measuring current in the positive direction. The measuring time is approx. 1.8 seconds
per reading for channels A and B, and 3 seconds for A-B.

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-I This selects the measuring current in the negative direction. Measuring time is approx. 1.8 seconds per
reading for channels A and B, and 3 seconds for A-B.
AVE This automatically switches the measuring current from forward to reverse direction and displays the
average of the 2 readings, thus eliminating any errors due to thermal emf. Measuring time
approximately 5.2 seconds per reading for channels A and B and 10.2 seconds per reading for A-B
2Current is reduced through the measuring probes by 2 (half power) enabling any probe self heating to
be determined. The best method of use for this option is to first allow the sensor to reach a steady
temperature and note the value; it will take some time for the sensor to stabilise. Select 2 current and
immediately press the ZERO key, the reduced current through the probe will reduce the heating effect
on the probe, and any value displayed will represent the temperature change due to the reduced
current. The advantages of using the ZERO key in this way are twofold; firstly, any errors in the
measuring amplifiers due to a change in current are removed, and secondly, from a calculation point of
view, the change in reading will be displayed without further calibration being required.
OPT Selects the various instrument configurations. The following options are offered:
Sys Conf displays information regarding the instrument configuration
Set Up
BACKLIGHT may be turned on/off press OK to confirm setting.
BEEPER may be turned on/off press OK to confirm setting.
TIME Current set time is displayed, to change press Chg and enter the new time. Hours/minutes/seconds
format is used. Press OK to confirm settings.
DATE Current set date is displayed, to change press Chg and enter the new date Days/Month/year format
is used. Press OK to confirm settings.
REM I/F If an interface card is fitted, pressing this key will display the various settings available to that interface
i.e. Baud rates, address etc. If no interface is fitted then a “No Option Available“ message is
displayed.
Trg: The trigger mode can be changed; selecting Sng enables the TRIG key to be used as a single trigger.
Only one measurement will be made and held on the display. Selecting Run enables the Run/Hold
mode. Pressing the TRIG key holds the reading with the current value held on the display. Press
TRIG again and the measurement is in Run mode with continuous measurements being displayed.
Ver Displays the Model and software versions

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RTD INPUTS
There are 2 LEMO sockets for the Pt100 inputs and the connections are as figure below. For the best performance
we recommend 4 wire sensors, but the TTI 7PLUS thermometers are able to measure with 2, 3, and 4 wire sensors.
The sensors may be plugged into either channel A or B. The connection plug for the PRT sensors is LEMO type
FGG.1B.306.CLAD52
View of input socket
PROBE CONNECTION
THERMOCOUPLE INPUTS
When measuring thermocouples, care should be taken to achieve the best results. The reference junction may be set
in three different modes, the first is automatic (INT) and Pt100 sensors are attached to the upper input sockets and
monitor their temperature automatically applying the corrections. The accuracy of the internal reference is
approximately 0.3C; to achieve more accurate results, an external reference may be used (Ext). When using an
external reference the Pt100 input is used to sense the external reference temperature. The accuracy of this is as for
Pt100 measurement, 0.01C. In addition to this there will be some errors due to the configuration of the external
reference but, generally with care, it is possible to achieve better results when using the external reference mode.
Finally, the reference junction may be switched off (OFF) and in this mode the thermometer assumes a reference
junction temperature of 0C. This mode of operation is used when an external automatic reference is used such as
our Veref series. Again, using this mode of operation gives slightly better results than will be achieved when using the
internal reference.

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CAUTION: When measuring thermocouples with the TTI 7PLUS it should be remembered that the temperature may
be read to 0.01C, and this is equivalent to approximately 0.4V per digit with a type K thermocouple. Care must
therefore be taken to avoid exposing the instrument inputs to draughts or a heat source such as sun shining on the
front panel. To obtain the best results the instrument should be placed in a temperature controlled room and
switched on for at least half an hour before measurements are made. Running on battery power without the mains
supply connected will also be of benefit. When connected to the mains the batteries will be charged and additional
heat generated inside the instrument. Great care should also be taken to ensure that the correct materials are used
when making connections and avoid unnecessary joints of different materials as these again will cause small errors.
We offer a range of thermocouple connectors for use with the TTI 7PLUS as well as a range of automatic reference
junctions and an external reference enclosure with integral Pt100 sensor; please ask our sales staff for more
information.
CALIBRATION
The TTI 7PLUS has been designed to give long service and permanence of calibration, together with a low cost of
ownership. Attention to detail in the design stage has produced an instrument that is quick and simple to recalibrate
with the minimum of equipment. Prior to calibration the unit should be placed in a temperature controlled
environment for a minimum of 4 hours. Care could be taken to use good quality test leads, thus avoiding any thermal
emf, together with resistance standards of known value. To select the Cal option, press the MEM key and then
select the Cal option from the menu. The calibration counter number will be displayed. A second menu choice will
be given - Cal or Prt. The Prt option will print the calibration constants to the screen. This is used as a diagnostic
tool to ensure that there is no corruption of these constants. Select the Cal option and you now enter the calibration
routine. The display will ask for a passcode to be entered, the default passcode number is 9252, enter this number
and press OK. The display will then give you the option of changing the passcode to your own personal number, if
you select Yes you will then be asked to enter your chosen number via the keypad ending by pressing OK. Any
number between 0 and 9999 is valid. You will then be asked to confirm your number. Once the new number is
accepted the calibration counter will increment 1. The display will then give a choice of calibration RTD, T/C, RJA,
RJB, it is preferable to calibrate the RTD ranges first.
RTD Calibration
Select this option by pressing RTD. Select Pt100, the display will then prompt you to connect 100 ohm resistance
standard to channel A. When connected press OK and you will be prompted to enter the exact value of the
standard. Once the value is entered and the OK pressed you will be asked to confirm the value by pressing OK again.
The instrument will then calibrate itself against this standard storing the calibration constants in the memory. Next
you will be asked to connect a 400 ohm resistance standard and repeat the above. Finally you will be prompted to
connect a 250 ohm resistance standard and again repeat the above. Once this calibration is completed the display
will return to the main menu. You now have the option to calibrate the Pt25 range. Follow the display instructions
using the 100Ω 25.5 Ω and 62.5 Ω standards.
Thermocouple Calibration
Select this option by pressing the T/C key in the calibration menu. Connect an mV source to the thermocouple input
of channel A using low thermal copper leads and connectors. The display will prompt you to set the input to 0mVdc
and press OK. Next +75mVdc should be supplied and OK pressed. Finally -75mVdc should be supplied and again
the OK pressed. These three values will calibrate the complete thermocouple range of the instrument. The display
will again return to the main calibration screen and the reference junction should now be calibrated.

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RJ Calibration
The reference junction of both channel A and channel B should be calibrated. Select RJA, insert a Pt100 standard
thermometer in the 4mm negative (lower) input socket of channel A, and allow the temperature to stabilise; it is
necessary to use a sensor that fits securely into this socket. Once the temperature of the socket has stabilised, and a
steady temperature reading is obtained, enter the temperature into the instrument. The screen will now prompt
you to enter the block temperature. Confirm the value and press OK. Repeat this procedure for channel B, moving
the sensor to the negative input socket in channel B.
Once both channels have been calibrated you may exit the calibration menu with the QUIT key.
Equipment Required
1 Resistance Standard Type RS3/100 Value 100 Ohms
1 Resistance Standard Type RS3/250 Value 250 Ohms
1 Resistance Standard Type RS3/400 Value 400 Ohms
1 Resistance Standard Type RS3/25.5 Value 25.5 Ohms
1 Resistance Standard Type RS3/62.5 Value 62.5 Ohms
1 mV source -75 … 0 … +75 mV
1 Pt100 sensor and measuring instrument
1 Calibration Lead Type TS01
The Value of the resistance standards should be known with an uncertainty ±5ppm or better
Suitable resistance standards are available for calibration together with a calibration connection lead, please consult
our sales staff.
Environment
We expect the TTI 7PLUS to give long and trouble free service but, as with everything, there will come a time when
you wish to replace it. Isotech will continue to develop new instruments and to update the design of existing models
and, therefore, will be able to offer an instrument suitable for your needs.
When disposing of the batteries care should be taken to comply with current legislation concerning their disposal. If in
doubt the batteries can be returned to our factory for safe disposal. In addition to the 2 sealed lead acid batteries
there is also 1 nickel cadmium battery which supports the logging memory.
WARNING
DO NOT DISPOSE OF BATTERIES IN FIRE
DO NOT SHORTCIRUIT
DO NOT PUNCTURE, OPEN, DISMANTLE OR OTHERWISE MECHANICALLY INTERFERE
WITH THE BATTERIES.
DO NOT SWALLOW

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CAL NOTEPAD
The models are supplied with Cal NotePad as standard. This easy to use package is compatible with MS Windows 9x.
A handbook for Cal NotePad can be found on the first installation disk in Adobe PDF format. If required a free Adobe
PDF reader can be downloaded from, www.adobe.com.
Cal Notepad can be used to log and display values from Dry Blocks and supported temperature indicators.
MINIMUM SYSTEM REQUIREMENTS
CNP requires Windows 95 / 98, a minimum of 5Mb of free hard drive space and free serial ports for the instruments
to be connected.
Development
CNP was developed by Isothermal Technology using LabVIEW from National Instruments.
License
Use of the Cal NotePad software program "CNP" is as granted in this license agreement. In using the CNP
software the user "licensee" is agreeing to the terms of the license. You must read and understand the terms of this license before
using CNP.
1, This license permits licensee to use CNP software on a single computer. The user may make copies for back up and archival
purposes freely as long as the software is only ever in use on a single computer at any one time. Please enquire about multi-user
licenses.
2, CNP is protected by international copyright laws and treaties. CNP must not be distributed to third parties.
3, CNP must not be reversed engineered, disassembled or de-compiled. Licensee may transfer the software to a third party
provided that no copies or upgrades of CNP are retained.
4, It is the responsibility of the user to ensure the validity of all stored results and printed certificates. Isothermal Technology Ltd
accept no responsibility for any errors caused by inappropriate use, incorrect set up or any other cause; including defects in the
software.
5, Limited Warranty. Isothermal Technology warrants that CNP will perform substantially as described in this manual for a period
of 90 days from receipt. Any distribution media will under normal used be guaranteed for a period of 90 days.
NO OTHER WARRANTIES, EXCEPT AS STATED ABOVE. The software and documentation is provided "as is" without warranty
of any kind and no other warranties (either expressed or implied) are made with regard to CNP. Isothermal Technology does not
warrant, guarantee or make any representations regarding the use or results of the use of the software or documentation and
does not warrant that the operation of CNP will be error free.
In no event will Isothermal Technology, its employees, agents or other associated people be liable for direct, indirect, incidental or
consequential damages, expenses, lost profits, business interruption, lost business information or other damages arising out the
use or inability to use CNP. The license fee reflects this allocation of risk.
CNP is not designed for situations where the results can threaten or cause injury to humans.
INSTALLING CAL NOTEPAD
I. Insert CNP DISK 1 into the disk drive
II. Click on the START button on the task bar, select RUN, type A:\SETUP (Where A: is your drive letter) then
click OK
III. Follow the prompts which will install the application and necessary LabVIEW run time support files.
IV. Should you ever need to uninstall the software then use the Add/Remove Programs option from the Control
Panel.

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STARTING CAL NOTEPAD
From a Standard Installation:
Click the START button
Highlight PROGRAMS
Select Isotech - Select Calpad
Note: Ensure the the TTI 7PLUS is switched on and connected to the PC before starting the software.
Configuring for the TTI 7PLUS
From File –Config select for Instrument and Channels TTI 7 ChA for Channel A or to log both channels select TTI 7
ChA and B.