Ametek DTI 100 User manual

User manual
Digital Temperature Indicator
DTI 100/1000
ã
ãã
ãCopyright 2001 AMETEK DENMARK A/S

100975 05 11-06-2001 1/32
Table of contents: Page
1. General information 3
2. Introduction 4
3. Functionality, overview 5
3.1 Functional description 6
3.2 Indicators 7
3.3 Touch pad 7
3.4 Connections 8
4. Labels 9
5. Operation 9
5.1 Operating area 10
5.2.1 Connection of sensors 10
5.2.2 Connections for analog out (DTI 1000 only) 10
5.2.3 Power supply 11
5.3.1 On / Off 12
5.3.2 Reading 13
5.3.3 Reset 13
5.3.4 Units 14
5.3.5 Resolution 15
5.3.6 Checking sensor coefficients 16
5.3.7 Light 16
6. Technical specifications 17
7. Maintenance and display error messages 18
7.1 Maintenance 18
7.2 Changing batteries 18
7.3 Display and error messages 19
8. Software 20
8.1 Installation 20
8.2 Connections 20
8.3 Starting the program 21
8.4 Setup (Analog output) (DTI 1000 only) 21
8.5 Measurements 21
8.6 Sensor coefficients/calibration 24
8.7 Recalibration (Calibration information) 27
8.8 Quit, About, Connection and Temperature unit 27
8.9 Error messages 28
9. Calibration 29
9.1 Recommended equipment 29
9.2 Starting the calibration 29
9.3 Calibration of the reference resistors 30
9.4 Calibration of analog out (DTI 1000 only) 31

2/32 11-06-2001 100975 05

100975 05 11-06-2001 3/32
1 General information
This manual is only effective for following products:
DTI model 1000
DTI model 100
DTI software
The products are manufactured by:
AMETEK DENMARK A/S
GYDEVANG 32 - 34
DK-3450 ALLERØD
DENMARK
TEL.: [phone]
FAX: [phone]

4/32 11-06-2001 100975 05
2 Introduction
The DTI (Digital Temperature Indicator) system is designed for fast and traceable calibration
and is ready for use. The system is portable.
Please read this manual carefully before use, to obtain maximum value of your DTI system.
The DTI is prepared for re-calibration by your local calibration laboratories, and all necessary
instructions for the re-calibration is stated in this manual.
The DTI is not designed for continuously data-logging recording, since there is no
guarantee for missed log values during the data-logging.
Definitions and terminology used in this manual:
a. Text inside <> refer to soft-keys on the DTI panel or keys on the PC keyboard.
Text with big letters indicate the activated function if there are more than one function
(example <ON/Off>).
b. Display text on the DTI is shown inside rounded frames.
c. Screen menus in the DTI software are shown inside edged frames.
WARNING:
* Read this manual before use.
* Do not use in hazardous area.
* Do not connect rated voltages to earth with a maximum
above 50V to the input terminals.

100975 05 11-06-2001 5/32
3 Functionality
Overview:
1a. Sensor1 connections.
1b. Sensor 1 connections, DTI 1000 only.
2a. Sensor 2 connections.
2b. Sensor 2 connections, DTI 1000 only.
3. Ground terminal for cable shields.
4. Display with 2 * 20 characters.
5. Softkeys.
6. RS232C connector.
7. Power inlet for mains adapter.
8. Analog out for channel 1, DTI 1000 only.
9. Analog out for channel 2, DTI 1000 only.

6/32 11-06-2001 100975 05
3.1 Functional description
The DTI is used for measuring inputs from two PT100 sensors in the range 0 to 360 Ω(-200
to 750°C). The two sensors are connected to the connectors in the top plate. The input signal
is compared to the two internal resistor references from which the input signal can be
determined.
The DTI operates with a 2*20 character display, which continuously read out the two inputs.
The input value can be shown as the actual read value for both sensors, the peak values for
sensor 1 or 2, the differential value for the two sensors or as the differential peak value for the
two sensors.
The input value can be shown in Ω, °C, °F or K selected by the user.
The resolution in temperature can be 0.1 or 0.01 for both models and also 0.001 for DTI 1000.
The 4th order polynomial coefficients can be inspected by the user and changed in the
software program.
The DTI 1000 also has analog output which corresponds to the temperature value for the
input where the signal range is from -0.5 to 3.75 volt. The gain and offset can be altered by
the user in the software program.Ö
ÖÖ
Ö
The power supply is made by eight 1.5 Volt batteries or a mains adapter (optional extra). Use
only mains adapter supplied by AMETEK in order to comply with the requirements in
EN50081-1 (1992) and EN50082-1 (1992).
It is possible to connect the shields from the cables to the cabinet, in order to reduce the
influence of noise.
Both models are supplied with RS232 and software, in order to have the possibility of saving
the measured data and to recalibrate the DTI or the sensors.
Ö
ÖÖ
ÖNote: If the temperature is outside the range set by gain and offset, the value of the
analog output signal is undefined.

100975 05 11-06-2001 7/32
3.2 Indicators
The DTI only uses the display for all indications. The display has 2*20 characters which will
swap between read-out values or menu selection when requested. Please see section 5.3.1 to
5.3.6 for possible display read-outs. Please note that the error messages will also be showed
in the display, see section 7.3.
3.3 Touch pad
There are 4 soft-keys on the touch pad panel, where 2 of the soft-keys have a double
function.
Switch ON or switch OFF the DTI. Please press down the key at least 0.2
seconds in order to switch on the unit.
MENU toggles between the menus: Mode/Unit/Resolution/Sensor
ENTER enters the menu function selected with the RESET/SELECT key.
RESET resets peak values for both channels.
SELECT toggles between the selected menu functions.
Switch on or switch off the light. The light can be activated for 10 seconds or
constantly.

8/32 11-06-2001 100975 05
3.4 Connections
All signal cables have to be connected to the top plate (grounding on the back plate).
Power and communication cables have to be connected on the back plate.
Top plate connection Back plate connections
Connections for sensors, where channel 1 is shown.
Please note that the LEMO-connector is only available on the DTI-
1000 model.
Connections for analog out (channel 1 and 2) for the 2 temperature
readings and only available on the DTI-1000 model.
Ground terminal for shield on the signal cables.
Power input for mains adapter 9VDC 200mA.
Connector for RS232C interface.

100975 05 11-06-2001 9/32
4 Labels
Sign Meaning Placement
Manufacturer logo Shows name and
address of manufacturer
Front plate foil
Instrument name Unambiguous statement
of the instrument name
Front plate foil
Display foil
Model specification Unambiguous statement
of the instrument model
Front plate foil
Serial number Unambiguous statement
of the instrument
Front plate sticker
CALIBRATION INSTRUMENTS
R
Type: DTI 1000
Volt/Hz: 8 x 15V DC
Serial No.: Xxxxxx-xxxxx
Year: 2000-33
Power:1.8 W
AMETEK DENMARK A/S GYDEVANG 32-34 DK-3450 ALLERØD
TEL. [phone] FAX. [phone] WWW.AMETEK.COM/TCI
Made in Denmark

10/32 11-06-2001 100975 05
5 Operation
5.1 Operating area
Both of the DTI models are intended for use in areas which meet the following:
Temperature range : 0°C/32°F to 50°C/122°F
Humidity : 0% to 90%
Protection class : IP20
WARNING: Do not use in hazardous areas!
5.2.1 Connection of sensors
The sensor should be connected to the terminals as shown in the figure below:
Use the ground terminal (see the figure "Overview" section 3, pos. 3) for the cable shields in
order to reduce noise.
The connector type to extra connector on DTI-1000 is: LEMO FFA 1S 304 CNAC.

100975 05 11-06-2001 11/32
5.2.2 Connections for analog out (DTI 1000 only)
The voltage output should be connected to a measuring device as shown in the figure below:
Use the ground terminal (see the figure "Overview" section 3, pos. 3) for the cable shields in
order to reduce noise.
5.2.3 Power supply
The DTI is supplied with 8 1.5 Volt batteries as standard. When the battery voltage is low
following message will appear:
BATTERY LOW
PRESS ANY KEY
This message will only appear one time after the DTI has been switched on, and is removed
by pressing the key <Menu/Enter> or <Reset/Select>. The DTI is still able perform accurate
measurements a little while longer.
The batteries are placed in the two battery holders shown in the figure below:
It is also possible to supply the DTI from a mains adapter at the connector shown in the
figure above. The mains adapter can be supplied by AMETEK.

12/32 11-06-2001 100975 05
5.3.1 On / Off
Start the DTI by activating the softkey <ON/Off>. Following message will be shown in the
display:
SELF-CALIBRATION
AND TESTING 1
This information states that the internal references and the sensor coefficients are checked.
If the coefficients are incorrect an error message will occur which is described in section 7.3.
The next message shown in the display will be:
SELF-CALIBRATION
AND TESTING 2
In this step the A/D converter is calibrated which approximately takes 1 second. When the
calibration is over following message will be shown:
SELF-CALIBRATION
AND TESTING 3
Test 3 is an internal voltage reference check, which approximately takes 4 seconds.
When all the test have succeeded, the DTI will show the model type and last calibration date
in the display:
AMETEK DTI-1000
CAL. DATE 940630
After this the input values will be shown in the display in the same format, as before the DTI
was shut off last time:
T1 23.65 °C
T2 23.60 °C
If there is no input signal or it is outside the measuring range a hyphen will be shown for that
specific channel.

100975 05 11-06-2001 13/32
5.3.2 Reading
In order to change the reading, you must press the softkey <MENU/Enter> 1 time. The
following message will be shown in the display:
MODE: T1
T2
Use the softkey <Reset/SELECT> to scroll between following types of read-out:
MODE SELECTION MENU READ-OUT MODE
MODE: T1 T1 23.65 °C
T2 T2 23.60 °C
│
MODE: DIFF (T1-T2) DIFF (T1-T2)
0.05 °C
│
MODE: T1 MAX. T1MAX. 23.66 °C
T1 MIN. T1MIN. 23.64 °C
│
MODE: T2 MAX. T2MAX. 23.61 °C
T2 MIN T2MIN. 23.59 °C
│
MODE: DIFF MAX. DIFFMAX. 0.07 °C
DIFF MIN. DIFFMIN. 0.03 °C
Use the softkey <Menu/ENTER> to select the specific read-out mode.
5.3.3 Reset
Use the softkey <RESET/Select> in order to reset the peak values in the selected difference
mode.

14/32 11-06-2001 100975 05
5.3.4 Units
In order to change the unit of the read-out, you must press the softkey <MENU/Enter> 2
times. The following message will be shown in the display:
UNIT: °C
Use the softkey <Reset/SELECT> to scroll between following types of units:
UNIT SELECTION MENU READ-OUT MODE
UNIT: °C T1 23.65 °C
T2 23.60 °C
│
UNIT: °F T1 74.57 °F
T2 74.48 °F
│
UNIT: ΩR1 109.210 Ω
R2 109.191 Ω
│
UNIT: K T1 296.80 K
T2 296.75 K
Use the softkey <Menu/ENTER> to select the specific read-out unit.
Please note that read-out in Ωhas one more digit than specified in the resolution set-up.

100975 05 11-06-2001 15/32
5.3.5 Resolution
In order to change the resolution on the read-out, you must press the softkey <MENU/Enter>
3 times. The following message will be shown in the display:
RESOLUTION: 0.01
Use the softkey <Reset/SELECT> to scroll between following types of resolution:
RESOLUTION SELECTION MENU READ-OUT MODE
DTI 100 + 1000
RESOLUTION: 0.01 T1 23.65 °C
T2 23.60 °C
│DTI 1000 only
RESOLUTION: 0.001 T1 23.651°C
T2 23.599°C
│DTI 100 + 1000
RESOLUTION: 0.1 T1 23.7 °C
T2 23.6 °C
Use the softkey <Menu/ENTER> to select the specific read-out unit.
The sample period is dependent on the selected resolution which can be longer than sample
rate to the display if a resolution above 0.1 is selected. The sample rates for the different
resolutions are shown below:
Resolution 0.1 0.01 0.001
Sample period 1 s 2 s 10 s
Please note that read-out in Ωhas one more digit than specified in the resolution set-up.

16/32 11-06-2001 100975 05
5.3.6 Checking sensor coefficients
In order to check the sensor ID and coefficients on the DTI, press the softkey
<MENU/Enter> 4 times. The following message will be shown in the display:
SENSOR 1: 9402244
R0 : 1.0000000E+02
Use the softkey <Reset/SELECT> to scroll through the coefficients:
(example with both sensors using default coefficients)
SENSOR 1: 9402244 SENSOR 2: 9402246
R0 : 1.0000000E+02 R0 : 1.0000000E+02
││
SENSOR 1: 9402244 SENSOR 2: 9402246
A : 3.9080200E-03 A : 3.9080200E-03
││
SENSOR 1: 9402244 SENSOR 2: 9402246
B : -5.8020000E-07 B : -5.8020000E-07
││
SENSOR 1: 9402244 SENSOR 2: 9402246
C : -4.2735000E-12 C : -4.2735000E-12
Use the softkey <Menu/ENTER> to leave this menu.
The coefficients are used in the equations:
Below 0°C:
Above 0°C:
5.3.7 Light
By pressing the softkey <Light> 1 time, the light will be switched on in the display for about
10 seconds. By pressing the softkey 2 times in a row the light will stay on. The light is
switched off by pressing the softkey again.
)
t
100)-(tC+
t
B+tA+(1
R
=R(t) 32
0⋅⋅⋅⋅
)
t
B+tA+(1
R
=R(t) 2
0⋅⋅⋅

100975 05 11-06-2001 17/32
6 Technical specifications
The specifications are for both DTI-100 and DTI-1000 unless otherwise specified.
Electrical data:
Measuring input: 2 channels for 4 wire PT100 sensors.
Measuring range: 0 to 360 Ω(-200 to 750°C).
Linearity: ±(0.014°C + 1 digit) excl. sensors at 23°C.
Calibration accuracy: ±10 ppm (0.01°C) excl. sensors.
Temperature drift: ± 0.003°C/°C.
Temperature resolution
DTI-1000: 0.1 / 0.01 / 0.001.
DTI-100: 0.1 / 0.01.
Units: °C / °F / Ω/ K.
Supply: 8 pcs. 1.5 V type AA batteries or 9 V mains adapter.
Battery life
Light ON: 10 hours.
Light OFF: 50 hours.
Analog out (DTI 1000 only)
Range: -0.5 to 3.75 V.
Accuracy: ±( 2mV + 0.05% of reading).
Temperature drift: ± 0.3mV/°C
Scaling: 0°C: 0V and 5mV/°C as default.
(can be changed in software)
EMC (directive 89/336/EEC): EN50081-1 (1992)
EN50082-1 (1992)
Mechanical data:
Weight: 2.2 kg.
Dimensions (H/W/D): 195 mm / 135 mm / 225 mm.
Operating conditions:
Temperature range: 0 to 50 °C
Humidity range: 0 to 90 %
Protection class: IP20
Storage temperature: -20 to 60°C

18/32 11-06-2001 100975 05
7 Maintenance and display error messages
7.1 Maintenance
The DTI does not require specific maintenance before or after use. The user may carry out
the following procedures him self.
Cleaning surfaces Use alcohol or water and a soft cloth.
Re-calibrate or change Use the software in order to re-calibrate/change the
coefficients for sensors sensor coefficients (see section 8.6).
Re-calibration of DTI Use the calibration routines in the software to re-calibrate
references or analog out the DTI (see section 9 to 9.4).
7.2 Changing batteries
The batteries are placed in the two battery holders shown in the figure below. The battery
holders can be pulled out by pressing the locks on both sides simultaneously.

100975 05 11-06-2001 19/32
7.3 Display and error messages
If the DTI detects an error while running, it will automatically appear in the display. Following
error messages can occur:
Display message:
BATTERY LOW
PRESS ANY KEY
T1 ////.///°C
T2 ////.///°C
CONSTANT ERRORS
DEFAULT VALUES
Meaning/Action:
Battery voltage low.
Change batteries
(section 7.2).
No sensor connected to input or measuring input
outside range.
Downloaded coefficients rejected.
Check calibration.
Default sensor coefficients used are:
R0: +100.000000 A :+3.90802E-3
B : -5.80200E-7 C : -4.27350E-12
Press any key to continue