Presys TE-25N User manual

EM0434-00
Technical Manual
R
TE-25N / TE-35N / TE-50N
Dry Block
Calibrators

The warranty conditions are available in our sites:
www.presys.com.br/warranty

PRESYS  Instrumentos e Sistemas TE-25N / TE-35N / TE-50N
EM0434-00
Table of Contents
1.0 - Introduction ................................................................................................................3
1.1 - Technical Specifications ........................................................................................... 5
1.2 - Order Code ............................................................................................................... 6
1.3 - Acessories ................................................................................................................ 7
2.0 - Calibrator Operation..................................................................................................8
2.1 - Menu IN .................................................................................................................... 9
2.1.1 - Input Connectons Diagrams ............................................................................ 10
2.2 - Menu CONF............................................................................................................ 11
2.3 - Manual Operating Mode ......................................................................................... 14
2.4 - Programmable Operating Mode ............................................................................. 14
2.5 - Automatic Operating Mode .................................................................................... 15
3.0 - Recommendations as regards Accuracy of Measurements ..............................17
3.1 - Getting a Better Accuracy from the Dary Block ..................................................... 17
3.2 - Recommendantions to Other types of Insert ......................................................... 18
4.0 - Safety Instructions...................................................................................................18
5.0 - Calibrator Warning Messages................................................................................18
6.0 - Calibration.................................................................................................................19
6.1 - Input Calibration ..................................................................................................... 19
7.0 - Instructions for Hardware Maintenance................................................................21
8.0 - Instructions for Fitting the Strap for Transport ...................................................21
9.0 - Tiny Steel Balls (Optional), Recommendations of Use.......................................22

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 3
1.0 - Introduction
TE-25N / TE-35N / TE-50N
The TE-25N, TE-35N and TE-50N Dry B lock Temperature Ca librators pr oduce
temperature v alues on t he t est b lock or insert s o as t o en able t he calibration of
thermocouples, r esistance t hermometers, gl ass t hermometers, t hermostats, et c.
In combination to pr oducing t he t emperature values with high ac curacy, it als o
offers the possibility of measuring the signals gener ated by thermocouples, resistance
thermometers, and thermostats t hat ar e b eing m easured. T his is po ssible b ecause it
incorporates a specific calibrator for these signals including 4 - 20 mA.
Thus, it per forms the f unctions of a t hermal bat h, a s tandard t hermometer, a
calibrator for RTD and TC sensors, and even measures mA.
The TE-25N, T E-35N and t he T E-50N models generates t emperatures f rom -
25 ºC to 155 ºC, -35 ºC to 155°C and -50ºC to 155°C, respectively.
• Presents i nput f or t hermocouples, t hermoresistances, t hermoswitches. B esides
generating temperature, it measures the signal from the sensor beign calibrated.
• Makes no use of external standard thermometer.
• Carries out completely automatic calibrations with or without the use of a computer.
• Accuracy to ±0.1°C, stability of ±0.02 ºC and resolution of ±0.01 ºC.
• Comunication between computer and ISOPLAN software.
• Portable, c ompact, pr ovides int erchangeable ins erts an d t ransportation b ag
(optional).
It presents a wide variety of programming resources, allowing the performance of
automatic calibrations of thermocouples, thermoresistances, thermoswitches. In this
case, the sensor is placed in the insert and its electrical terminals are c onnected t o the
embedded calibrator. T he operator d efines t he c alibration points a nd the n umber of
repetitions, then the process is started and all the sequence is automatically
accomplished.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 4
Another way of performing automatic documented calibrations is by means of the
ISOPLAN Calibration Software for PC/WindowsTM, which uses RS-232 or RS-485 serial
communication to connect the computer to the dry block. With ISOPLAN software it is
possible to register sensors and instruments of a factory, generate work orders, create
and print management to the calibration environment.
The TE-25N, TE-35N and TE-50N models has also many other features, such as:
• The electric signal calibrator is independent from the dry block function.
• Internal buzzer beeps when the temperature reaches the desired value.
• Keypad that eases the operation and configuration of the calibrator.
• Graphic liquid crystal display to present big-size digit numbers.
• Thermoelement reading scaled to ITS-90 or IPTS-68.
• Internal regulated 24 Vdc power supply for 2-wire transmitters.
• Internal rechargeable battery and battery charger included in the electric
signal calibrator.
• Independent circuitry for over-temperature protection and safety.
• Insert to choose, strap and test leads included.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 5
1.1 - Technical Specifications
TE-25N
TE-35N
TE-50N
Operating Range
Ambient Temperature:
up to 23 °C
-25 ºC to 155 ºC
-35 ºC to 155 ºC
-50 ºC to 155 ºC
Accuracy with Internal
Reference
 0.1 ºC
 0.1 ºC
 0.1 ºC
Resolution
0.01 ºC
Stability
(after 10 minutes)
0.02 ºC
Axial Uniformity (40mm)
± 0.05° (2)
± 0.06° (2)
± 0.07° (2)
Radial Uniformity Dry
Block:
± 0.01 °C (2)
± 0.01 °C (2)
± 0.02 °C (2)
Heating Time:
10 min
(25 ºC to 140ºC)
16 min
(25 ºC to 140 ºC)
11 min
(25 ºC to 140 ºC)
Cooling Time:
11 min
(25 °C to -25°C)
16 min
(25 °C to -35°C)
25 min
(25 °C to -50°C)
Eletric Power:
200 W
300 W
400 W
Power Supply:
115 Vac or 230 Vac 50/60 Hz(1).
Units / Temperature
Scales:
°C or °F/ ITPS-68 or ITS-90 selected by the user
Well Diameter / Depth:
Ø 25.4 mm (1”) x 124 mm
Weight:
9.0 kg
10.0 kg
12.0kg
Dimensions (HxWxD)
260 x 180 x 305 mm
260x 180x 270 mm
315 x 180x 270 mm
Environmental
Operating Conditions:
0 to 50°C/ 0 to 90% UR
(1) As per Order Code
(2) In full range
Warning: The achievement of -25ºC or -35ºC or -50ºC depends on the temperature and
humidity conditions of the laboratory where the calibrations are performed. In general, it
can be reached at an ambient temperature of 23 ºC and relative humidity less than 60%.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 6
1.1.1 - Input Technical Specifications
Input Ranges
Resolution
Accuracy
Remarks
Probe Ext.¹ 0 to 400
0.01 Ω
± 0.005 % FS
Probe Ext.¹ -200 to 850 ºC / -328 to 1562 ºF
0.01 ºC / 0.01 ºF
± 0.05 ºC / ± 0.1 ºF
IEC-60751
millivolt -150 to 150mV
150 to 2450mV
0.001mV
0.01mV
± 0.01% FS
± 0.02% FS
R input > 10M 
auto-ranging
mA -1 to 24.5mA
0.0001 mA
± 0.02% FS
R input < 160 
Resistance 0 to 400
400 to 2500 
0.01 
0.01 
± 0.01% FS
± 0.03% FS
excitation current
0.9mA auto range
Pt-100 -200 to 850 ºC / -328 to 1562 ºF
0.01 ºC / 0.01 ºF
± 0.1 ºC / ± 0.2 ºF
IEC-60751
Pt-1000 -200 to 400 ºC / -328 to 752 ºF
0.1 ºC / 0.1 ºF
± 0.1 ºC / ± 0.2 ºF
IEC-60751
Cu-10 -200 to 260 ºC / -328 to 500 ºF
0.1 ºC / 0.1 ºF
± 2.0 ºC / ± 4.0 ºF
Minco 16-9
Ni-100 -60 to 250 ºC / -76 to 482 ºF
0.1 ºC / 0.1 ºF
± 0.2 ºC / ± 0.4 ºF
DIN-43760
TC-J -210 to 1200 ºC / -346 to 2192 ºF
0.1 ºC / 0.1 ºF
± 0.2 ºC / ± 0.4 ºF
IEC-60584
TC-K -270 to -150 ºC / -454 to -238 ºF
-150 to 1370 ºC / -238 to 2498 ºF
0.1 ºC / 0.1 ºF
0.1 ºC / 0.1 ºF
± 0.5 ºC / ± 1.0 ºF
± 0.2 ºC / ± 0.4 ºF
IEC-60584
IEC-60584
TC-T -260 to -200 ºC / -436 to -328 ºF
-200 to -75 ºC / -328 to -103 ºF
-75 to 400 ºC / -103 to 752 ºF
0.1 ºC / 0.1 ºF
0.1 ºC / 0.1 ºF
0.1 ºC / 0.1 ºF
± 0.6 ºC / ± 1.2 ºF
± 0.4 ºC / ± 0.8 ºF
± 0.2 ºC / ± 0.4 ºF
IEC-60584
IEC-60584
IEC-60584
TC-E -270 to -150 ºC / -454 to -238 ºF
-150 to 1000 ºC / -238 to 1832 ºF
0.1 ºC / 0.1 ºF
0.1 ºC / 0.1 ºF
± 0.3 ºC / ± 0.6 ºF
± 0.1 ºC / ± 0.2 ºF
IEC-60584
IEC-60584
TC-N -260 to -200 ºC / -436 to -328 ºF
-200 to -20 ºC / -328 to -4 ºF
-20 to 1300 ºC / -4 to 2372 ºF
0.1 ºC / 0.1 ºF
0.1 ºC / 0.1 ºF
0.1 ºC / 0.1 ºF
± 1.0 ºC / ± 2.0 ºF
± 0.4 ºC / ± 0.8 ºF
± 0.2 ºC / ± 0.4 ºF
IEC-60584
IEC-60584
IEC-60584
TC-L -200 to 900 ºC / -328 to 1652 ºF
0.1 ºC / 0.1 ºF
± 0.2 ºC / ± 0.4 ºF
DIN-43710
FS: Full Scale
Note (¹): Accuracy refers to external probe input only. The value does not include sensor accuracy or
errors due to sensor characterization.
The accuracy values cover a one year period and an ambient temperature range between 20 and 26
°C. Outside this range, add 0.001 %FS / ºC, with reference to 23 ºC. For thermocouples with internal
cold junction compensation, a cold junction compensation error of ± 0.2 °C or ± 0.4 °F must be
considered.
1.2 - Order Code

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 7
1.3 - Acessories
• Inserts:
Description
Holes
Order Code
IN01
1 x 3/4’’
06.04.0011-00
IN02
1 x 1/2’’
06.04.0012-00
IN03
1 x 6,0 mm and 3 x 1/4’’
06.04.0013-00
IN04
3 x 6,0 mm and 1 x 1/4’’
06.04.0014-00
IN05
4 x 6,0 mm
06.04.0015-00
IN06
2 x 6,0 mm e 2 x 1/4’’
06.04.0016-00
IN07
1 x 6,0 mm, 1 x 8,0 mm and 1 x 3/8’’
06.04.0017-00
IN08
1 x 6,0 mm, 1 x 3,0 mm and 2 x 1/4’’
06.04.0018-00
IN09
Without hole, to be drilled by the client
06.04.0019-00
IN10
Outros, sob encomenda.
06.04.0020-00
IN1P
1 x 3,0 mm, 1 x 6,0 mm, 1 x 8,0 mm e 1 x 1/4’’
06.04.0121-00
IN1A
1 x 1/8”, 1 x 3/16’’, 2 x 1/4” e 1 x 3/8"
06.04.0122-00
IN1E
1 x 4,0 mm, 1 x 6,0 mm, 1 x 8,0 mm,
1 x 10,0 mm e 1 x 1/4”
06.04.0123-00
Note: When asked, the calibration certificate will be provided for the first insert ordered.
• Temperature sensors:
Description
Order Code
Probe 1/5 DIN Straight (mini-DIN conector )
04.06.0001 - 21
Probe 1/5 DIN Angular 90° (mini-DIN conector )
04.06.0007 - 21
• Communication Interfaces
Description
Order Code
RS-232 - DB-9F Conector (COM1)
06.02.0002 - 00
RS-232 - DB-25F Conector (COM2)
06.02.0004 - 00
RS-485
06.02.0006 - 00
• Soft Carrying Case. Order Code: 06.01.0006-00 (T-25N/T-35N) and 06.01.1016-10
(T-50N).
• ISOPLAN Calibration Software.
• Calibration Certificate.
Included Items:
- Strap;
- Insert (selectable);
- Insert extractor tool;
- Test leads;
- Power cord;
- Manual and calibration certificate.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 8
2.0 - Calibrator Operation
The calibrator keeps the block temperature controlled and allows the
reading of a thermo-element connected to its terminals. It is possible to verify
the thermocouple, thermoresistances, temperature transmitters etc. together
with the block temperature value and temperature set point.
The calibrator has 3 operating modes:
• Manual Mode to select the block temperature straight from the keypad.
• Programmable Mode: 6 different programs with 11 temperature set point
values. The block temperature is selected among the programmed values by
the keys  and . The Programmable Mode with Timer scans automatically
the temperature set points.
• Automatic Mode to calibrate thermo-elements. The thermo-elements
calibration is performed in an automatic way by the calibrator: the schedule
and the calibration results, besides the thermo-element readings are stored in
the calibrator memory.
When powered on (ON/OFF key), the calibrator goes through a self-test
routine and shows the last calibration date and the value of the battery voltage. The
battery voltage is constantly monitored and the low battery warning is provided.
After the self- test is completed, the display shows the starting menu. he initial set
point is 25.00 ºC:
IN EXEC
CONF CAL COM
Através das teclas , , e, escolha as opções do menu e tecle ENTER.
By means of keys , ,  and , choose the menu options and press
ENTER.
IN: selection of the calibrator signal input. Choose among mV, Ohms,
thermocouples, thermoresistances, mA, switch or none. More details in item 2.1 - Menu IN.
EXEC: The calibrator enters the manual or programmable operating mode.
CONF: Accesses the calibrator configuration options. More details in item
2.2 - Menu CONF.
CAL: This option accesses the TE-25N/TE-35N/TE-50N calibrator adjust
functions, protected by password. More details in section 6 - Calibration.
COM: Accesses the automatic calibration parameters. It is possible to perform a
calibration without a computer or using it (via the ISOPLAN software). More details in item
2.5 - Automatic Operating Mode.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 9
2.1 - Menu IN
mV OHM TC
RTD mA SW NO
mV, mA, SW: selects milivolt, miliampere or switch input, respectively.
OHM: selects ohms input. Following, choose from the menu the wiring 2, 3 or 4
wire.
2-WIRE 3-WIRE
4-WIRE
TC: selects thermocouple input. Choose among the J, K, T, E, N and L types. In
the next menu, the internal or manual cold junction compensation is chosen.
INTERNAL
MANUAL
If the internal compensation is selected, the cold junction temperature value is
displayed by the calibrator. If the MANUAL option is selected, the cold junction must be
supplied by the operator. After confirming the value, by pressing ENTER, the calibrator
goes back to the operating mode.
RTD: Selects the type of thermoresistance used. Choose from PT100, NI100, CU10
and PT1000 types. Choose also if the wiring is 2, 3 or 4-wire.
NO: Disables reading of external signal.
Selecting one of the options above, the calibrator goes straight to the manual
operating mode, with no need to select the EXEC option.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 10
2.1.1 - Input Connectons Diagrams

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 11
2.2 - Menu CONF
CF PRG MEM LCD
SC BT DT BZ
CF: Selects the temperature unit between ºC or ºF. The ITS-90 or IPTS-68
temperature scales are selected for both the thermo-element and for the internal block
reference readings purpose.
ºC-90 ºF-90
ºC-68 ºF-68
LCD: This option sets the graphic liquid crystal display contrast. Use the key 
and  until you get a better contrast and finish the operation by pressing the key
ENTER.
BT: Shows the battery or the battery charger voltage value if the dry block is
turned off or on, respectively.
Battery Level
Estado da bateria
Display
4.0 a 7.0V
normal
----------
< 4.0V
low
LOW BATTERY
DT: Updates the date and time of the calibrator. Thus, when the calibrator
performs a calibration in the automatic mode via ISOPLAN-5, all data are registered
together with date and time of occurrence. Every time the calibrator is powered off, the
internal clock does not continue to be updated. However, the ISOPLAN-5 software can
automatically update the calibrator date and time with the computer internal clock.
Otherwise, use keys  and  to change the field that blinks and the keys  and  to
go to another field. The key ENTER confirms the last selection.
BZ: Menu that configures the piezoelectric buzzer.
NO YES ENDCAL
NO: Disables the buzzer.
YES: The buzzer beeps when the block reaches the set point and stabilizes.
ENDCAL: The buzzer beeps only at the end of a calibration in the automatic
operating mode.
PRG: Menu that programs the calibrator.
 DEC_IN DEC_PRB
SET POINT
DEC_IN: Selects the number of decimals of the thermo-element reading. The
default value depends on the input signal.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 12
DEFAULT
0 1 2 3 4
DEC_PRB: Selects the number of decimals of the block temperature and the
set point value. The default number is 2.
0 1 2
SP: Enables the calibrator Programmable Operating Mode, and allows the
configuration of programmed values. The selected program is indicated by the selection
arrow. Choose one of the 6 temperature programs or NO to disable this Programmable
Mode.
Select any of the 6 programs and confirm with the key ENTER. Following, it is
shown the menu of temperature set point configuration.
10% 20% 25%
VARIABLE
Change the configuration to steps (STEPS) of 10%, 20%, 25%, VARIABLEor press
C/CE to maintain the configuration already stored in memory. The temperature range of the
program must be configured through the values in SET POINT HIGH and SET POINT LOW
in case of 10%, 20% or 25% fixed steps of the range. The option VARIABLE allows the user
to define from 2 to 11 values of temperature set point, not necessarily in ascending order.
To verify the step values of a program, select the VARIABLE option and confirm the
values shown in the display with the key ENTER. The 10%, 20% and 25% options change
the number of steps automatically and recalculate the values according to SET POINT HIGH
and SET POINT LOW.
SC: Esta função realiza o escalonamento das leituras do termoelemento. O
escalonamento é muito útil na calibração de transmissores de temperatura, por
exemplo, pois facilita a visualização da temperatura atual e a leitura do transmissor na
mesma escala. O erro pode ser verificado diretamente em ºC ou ºF. Selecione a opção
SC e tecle ENTER. Caso nenhuma entrada esteja selecionada na opção IN, o
calibrador mostrará a mensagem SELECT INPUT FIRST. Retorne ao menu IN e
selecione o tipo de sinal de entrada.
SC: This function scales the input reading. The scaling is very useful in temperature
transmitter calibration, for instance, because it displays the current temperature and the
transmitter reading (mA) in the same unit. Thus, the error can be verified directly in ºC or ºF.
Select the option SC and press ENTER. If no input is selected in IN, the calibrator will show
the SELECT INPUT FIRST message. In this case, go to menu IN and select the input signal
type.
The function SC will show IN or NO. Confirm IN to configure the scaling or NO to
disable the SC function, with the key ENTER.
The scaling is performed via the INPUT HIGH and INPUT LOW parameters,
corresponding to the maximum and minimum values of the calibrator signal input, in the For
example, temperature transmitter with 0 to 100 ºC input and 4 to 20 mA output. The scaling
with one decimal would be:

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 13
INPUT HIGH:20.0000 mA
INPUT LOW: 4.0000 mA
SCALE DEC (0-4): 1
SCALE HIGH: 100.0 #
SCALE LOW: 0.0 #
MEM: The TE-25N/TE-35N/TE-50N calibrator allows many special programs and
functions that can be of frequent use. In situations like this, it would be useful to store the
current configuration in memory in order to save time. Up to 8 configurations can be stored
in memory.
Selecting the option MEM, it is possible to store the current configuration (WRITE),
restore a previous stored configuration (RECALL) or erase the 8 configurations from
memory (CLEAR ALL).
WRITE RECALL
CLEARALL
Selecting the option WRITE or RECALL will present a new menu with numbers 1 to
8, representing each one of the memory positions. Choose one of the positions and press
ENTER. The writing operation (WRITE) can be made in an already used memory position.
The calibrator asks for the overwriting confirmation with the message OVERWRITE
MEMORY?. The CLEAR ALL operation shows a confirming message ARE YOU SURE?.
In both cases, press ENTER to confirm the operation or C/CE to cancel.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 14
2.3 - Manual Operating Mode
The display shows the selected temperature
There are 4 ways in which the information are shown, covering the calibrator input
value (IN), the block temperature (PROB) and the temperature set point (SET). The key
 interchanges the display presentation way:
IN = 23.456 mV
PROB= 25.01 ºC
PROB= 25.01 ºC
SET = 25.00 ºC
23.456
IN = Voltage (mV)
25.01
SET = 25.00 ºC
The block temperature set point is selected directly by the keypad, even if the
message SET is not being displayed. The numeric keypad enables the SET
selection in any of the display presentation ways, to change the set point.
The set point value is increased by key  and decreased by key . While
the keys are kept pressed, the set point continues to be increased or decreased.
The key  does not have function in the manual operating mode of the TE-
25N/TE-35N/TE-50N calibrator.
2.4 - Programmable Operating Mode
Pre-configured programs can be load from the calibrator memory, enabling the
programmable operating mode. The temperature programmed values of the block are
used directly, with no need to enter the set poit.
The display shows STEPn beside the block temperature set point value in the
programmable mode. The number of the program is indicated by n. Using the keys 
and , the programmed values of temperature set point are changed. The numeric
keypad continues available for manual selection of the block temperature in the same
way of the manual operating mode.
The automatic scan over the programmed temperatures is implemented by
defining the stabilization time of the thermoelement in the block.
The key  enables the automatic scan over the points. When pressed, the message
STEPn gives place to 0s and the calibrator waits for the stabilization time configured from 1
to 9 minutes, by the keys 1 to 9. The automatic scan is disabled by pressing key  again.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 15
The countdown of the stabilization time is only started when the block temperature
reaches the programmed temperature and stabilizes withing a range of aproximately
0.05 ºC. At this time the buzzer beeps, in case it is configured to YES.
2.5 - Automatic Operating Mode
The thermoelement calibration is perfomed in an automatic way bay the calibrator.
The configuration, as well as the calibration verification is carried out by the calibration
itself. Also it is possible to use the ISOPLAN software and its work orders, like a CAC –
Computer Aided Calibration.
The independent automatic calibration, without the use of ISOPLAN is planned in
the option TAGMAN from the menu COM.
TAG EXEC VERIF
ADDRESS TAGMAN
Before you start programming, configure first the signal that will be read by the
calibrator in the menu IN. To calibrate glass thermometers, for example, there is no
eletric sinal to be read. In this case, option IN from the menu must be configurede to NO
and the calibrator will ask to enter the value indicated by the thermometer, at the end os
the stabilization time os each calibration point.
The data for an automatic calibration concern:
• TAG: the thermo-element tag identification.
• SP: the block temperature reference values for the calibration (calibration points).
• TOL: the maximum tolerance for the thermo-element operation.
• STB: the stabilization time, in seconds, so that the thermo-element
temperature indicates correctly. This timer starts just after the block reaches
and stabilizes at the set point temperature.
• STR: the calibration strategy of the programmed reference values. The
available strategies are:  (UP), (DOWN),  (UP - DOWN),  (DOWN
- UP),  (UP - DOWN - UP) and  (DOWN - UP - DOWN).
• RP: the strategy number of repetitions.
• RGI: the thermo-element indication range.
• RGO: the operating temperature range that corresponds to the indication
range
The automatic calibration begins when the option EXEC from the menu COM is
selected. All the operations are automatizally performed by the calibrator. The keypad
dows not work until the end of the calibration.
At the end of the stabilization time, the calibrator stores the thermoelement
reading in memory and goes to the next point, in case some input signal has been
previosly configured in the menu IN and connected to the calibrator terminals.
The CALIBRATION END message appears on the display at the end of the
automatic calibration. Press ENTER to confirm. The results can be verified in option
VERIF from the menu COM.
The first message in option VERIF informs the calibration result, with the number of
points that have succeeded. Following, press ENTER to verify each one of the readings

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 16
performed by the calibrator. The keys  and  interchange 2 screens: one that displays
the block and thermo-element temperature value and the other displays a message
indicating the calibration point number and its state (OK or FAIL), besides the error value
in %.
The option TAG from menu COM can present a list of up to 4 tags that have been
downloaded or uploaded with the ISOPLAN-5 software. The key ENTER selects the tag to
be calibrated from the tag list. The automatic calibration starts by the option EXEC from
menu COM and the calibration data can be verified in option VERIF. To calibrate
automatically not using ISOPLAN-5, there is a reserved place for one manual tag. The
selection of the manual tag is performed by confirming the option TAGMAN with the key
ENTER.
The option ADDRESS selects the communication address of the TE-25N/TE-
35N/TE-50N calibrator. The communication protocol used is ModBus - RTU, with no parity
and baud rate of 9600. The calibrator communication with the computer can use RS-232 or
RS- 485, for network option, according to the communication interface used. In order to
communicate with the ISOPLAN software, configure ADDRESS to 1.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 17
3.0 - Recommendations as regards Accuracy of Measurements
PRESYS dry block temperature calibrators are instruments of high accuracy level,
requiring t he obs ervation of all t he pr ocedures des cribed in t his s ection, in or der t o
achieve the necessary conditions to get the accuracy levels during the calibrations.
• Special at tention s hould be paid in r elation t o t he ins ert c leanliness. W hen
necessary, it s hould a lways b e was hed wit h water and s oap, wee l r insed an d
dried. Oil, grease, solid particles can hinder the heat transferecnce to the insert
and even jam the insert inside the block.
• The sensor to be c alibrated must fit snugly into the appropriate well. In case the
isensor is loos e, t he m easurement ac curacy m eaning c an be c ompletely
senseless. The meaning of clearance between the sensor and the respective well
should b e un derstood i n a s ubjective w ay and t he common s ense is very
importante. Thus, the sensor should enter the insert well (both completely clean)
in such a way to stay snugly enough só that it can not move or swing inside but it
should not enter by force to get jammed.
• In t he s pecific c ase of g enerating n egative temperature wit h the TE-25N/TE-
35N/TE-50N model, t he c alibrations s hould be per formed i n a des cending
temperature or der. T his procedure is useful beacause i n negative t emperatures
ice is formed in the insert surface and between the insert and the thermoelement
being calibrated. This humidity change the thermal contact and cause error in the
calibration. After finishing the use of the insert below 0 °C, increase the set poit to
a positive temperature value, withdraw the insert from the block and t he sensor,
dry completely all t hese partes before continuing the calibration. This procedure
guarantees an accuracy next to
y all these partes before continuing the calibration. This procedure
0.1 °C. In case you can accept higher values of
accuracy, like 0.2 ºC or more, these cares can be left apart.
3.1 - Getting a Better Accuracy from the Dary Block
The temperature control is based in the temperature measurement of an internal
sensor placed in the block.
This control sensor is adjusted in a factory by means of amother sensor with high
accuracy ( probe) c onnected t o a s uperthermometer, as des cribed in item 6. 2 – Probe
Calibration. So, at factory, the accuracy of the superthermometer is transferred to the dry
block c alibrator. T he t ransference w ill be w ell per formed on ly wh en t here ir a per fect
temperature equilibrium between the internal control sensor and t he superthermometer
probe. Therefore, it should not have any clearance between the insert and the block or
between the probe and the insert. Both the internal sensor and the probe should also be
at the same depth.
The user will get the best accuracy from the dry block, provided in t his technical
manual, in c ase on e s ucceds in r eproducing t he s ame c onditions os t he f actory
adjustment, that is, the same insert used in factory, no clearance, same depth, etc.
Summing up, the important thing to get the best accuracy from the dry block is to
reproduce the process used by the factory to adjust the dry block itself.

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 18
In this case, the dry block is only used as a heat generator, not as a standard
temperature calibrator. The user can use the fact that the dry block stability value is
much lower than its accuracy value. So, placing the superthermometer sensor and the
thermo-element under calibration in a two-hole-insert, it is possible to compare both
temperature measurements.
3.2 - Recommendantions to Other types of Insert
When the user uses a different type of insert, other than the one used to adjust the
dry block, for example the cup like insert fulfilled with tiny steel balls, the accuracy from the
manual is no longer valid, since the thermal contact is different in relation to that insert.
However, another control sensor adjustment can be performed to the new insert. Do
that using an external probe with high accuracy, placed in the new insert and follow the
steps described in item 6.2 - Probe Calibration.
This new readjustment of the calibrator indication overwrites the factory calibration
and it remains even after turning off the dry block.
Should you want the factory calibration back again, activate the option RESTORE
from menu calibration / probe.
4.0 - Safety Instructions
• If the calibrator is turned on, do not leave the room without an identification or
warning about the high temperature hazard.
• Before turning the calibrator off, return the block temperature to values close
to the ambient temperature.
• Never remove the insert from the dry block or the thermo-elements from the
insert, while they are in temperatures far from the ambient. Wait until they
reach the ambient temperature so that the heterogeneous cooling of the parts
do not jam each other.
5.0 - Calibrator Warning Messages
Warning
Meaning
Procedure
RAM ERROR READ
MANUAL
Problem in RAM memory
Turn the calibrator off
and on. If the error
persists, send the
instrument to the factory
EEPROM ERROR
READ MANUAL
Problem in
EEPROM memory
Same as the previous
item
LOW BATTERY
Level of battery voltage
is low
Check the TE-
25N/TE-35N/TE-50N
calibrator power
supply
UNDER / OVER
Input signal out of
specifications or
scaling range
See item 1.1.1 on
Input Specifications
????.??ºC
Input sensor is open
Check input connections
and sensor

PRESYS  Instruments TE -25N / TE-35N / TE-50N
Page 19
6.0 - Calibration
Warning: Enter the following options only after understanding them completely.
Otherwise, it may be necessary to return the instrument to the factory
for recalibration!
Select CAL option from the menu and press the ENTER key. You should then
enter the password (PASSWORD) 9875 to access the calibration menu.
The password functions as a protection to calibration ranges. After the passowrd
is entered, the menu displays the options:
You should then choose the input range (IN) as the output range (OUT) is not
available for the user. DATE is an option which allows you to record the date on which the
calibration was performed and once it has been filled in, it will be displayed every time
the calibrator is turned on.
Options for IN calibration are:
6.1 - Input Calibration
Select the corresponding mnemonic and apply the signals presented in the tables
below.
When calibrating inputs, the display shows on the 2nd line the value measured by
the calibrator and on the 1st line the same value is expressed as a percentage.
Note that the applied signals just need to be close to the values shown in the
table.
Once the signal has been applied, store the values of the 1st and the 2nd
calibration points, by pressing keys 1 (1st point) and 2 (2nd point).
mV Input
1st point
2nd point
G4
0,000 mV
70,000 mV
G3
0,000 mV
120,000 mV
G2
0,000 mV
600,000 mV
G1
600,000 mV
2400,000 mV
mA Input
1st point
2nd point
Single range
0,0000 mA
20,0000 mA
Input calibration for  is performed in two steps:
 mV mA OHM CJC
PROBE
 IN OUT DATE