Presys T-650PH User manual

Dry Block Calibrator Controls
Temperature T-650PH
EM0340-00
®
Technical Manual
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WARNING!
Avoid electric shock risk when touching the equipment:
- Use only suitable power cable with earth connection;
- Never power the equipment to the mains socket without earth connection.
WARNING!
High voltage is present inside this equipment.
It can cause great damages and injuries.
Do not make any repair service inside the equipment without removing the plug
from the supply.
WARNING!
Much electromagnetic noise can cause instability to the equipment.
The equipment is provided with electromagnetic interference filters that protect
not only the mains but also the equipment itself against noise. These filters have no
function if the unit is not earthed properly.
WARNING!
High temperatures are achieved in this equipment.
Risk of fire and explosion are present in case safety measures are not taken.
Sign by means of warnings the hazardous areas at high temperatures.
Do not place the dry-block on inflammable surfaces or even on materials that
can be deformed due to high temperatures.
Do not obstruct any air-vent to avoid risk of fire in the equipment.
WARNING!
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 does not jam
each other. If, by chance, a jamming situation happens, refer to item 8.2 - Instructions
for Insert Jamming to proceed properly.
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EC Declaration of Conformity
We declare under our sole responsability that the CE marked products, are in conformity
with the essential requirements of the following EC Directives when installed in
accordance with the installation instructions contained in the product documentation:
Series
T-650PH
Description
Dry-Block Temperature Calibrator
LVD
Low Voltage Directive
2006/95/EC
of the European Parliament and of the Council of 12 December 2006 on
the harmonization of the laws of Member States relating to Electrical Equipment
designed for use within certain voltage limits.
EN 61010-1:2011
Safety requirements for electrical equipment for measurement, control and laboratory
use
EN 61010-2:010
Safety requirements for electrical equipment for measurement, control and laboratory
use - Part 2-010: Particular requirements for laboratory equipment for the heating of
Materials.
EMC directive
2004/108/EC
of the European Parliament and of the Council of 15 December 2004
on the approximation of the laws of the Member States relating to electromagnetic
compatibility and repealing Directive 89/336/EEC
EN 61326-1:2003
Electrical equipment for measurement, control and laboratory use - EMC requirements
São Paulo, 8 September 2015
Vinicius José Gomes Nunes
Antonio Rafael Sito Antunes
CEO
Engineering Manager
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PRESYS Instruments T-650PH
EM0340-00
Table of Contents
1 - Introduction ...............................................................................................................1
1.1 - Technical Specifications........................................................................................2
1.1.1 - Input Technical Specifications........................................................................3
1.2 - Order Code...........................................................................................................3
1.3 - Accessories ..........................................................................................................3
2 - T-650PH Calibrators Operation ................................................................................5
2.1 - Menu IN................................................................................................................6
2.1.1 - Input Connections Diagrams ..........................................................................7
2.1.2 - External Probe Connection.............................................................................8
2.2 - Menu CONF..........................................................................................................9
2.3 - Manual Operating Mode......................................................................................13
2.4 - Programmable Operating Mode..........................................................................13
2.5 - Automatic Operating Mode .................................................................................14
3 - Recommendations as regards Accuracy of Measurements ................................16
3.1 - Getting a Better Accuracy from the Dry Block.....................................................16
3.2 - Recommendations to Other types of Insert.........................................................17
4 - Safety Instructions..................................................................................................18
5 - Calibrator Warning Messages ................................................................................18
6 - PID Control Parameters ..........................................................................................19
7 - Calibration................................................................................................................20
7.1 - Input Calibration..................................................................................................20
7.2 - Probe Calibration................................................................................................21
8 - Maintenance.............................................................................................................23
8.1 - Instructions for Hardware....................................................................................23
8.2 - Instructions for Insert Jamming...........................................................................23
9 - Instructions for Fitting the Strap for Transport ....................................................23
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1 - Introduction
T-650PH
T-650PH dry block calibrator controls temperature of an insert in order to calibrate
thermocouples, thermoresistances, glass thermometers, thermoswitches etc. Besides
providing high accuracy temperature values, it also allows the measurement of signals
generated by thermo-elements which are being calibrated. This is possible due to an
embedded calibrator specific for these types of signal, including 4-20 mA. Thus, they
incorporate the functions of dry block, standard thermometer and calibrator for RTD, TC
and mA.
T-650PH calibrator model generates temperatures from room temperature to
650ºC (1202ºF).
Present input for thermocouples, RTDs, thermoswitches. Besides generating
temperature, they measure the signal from the sensor being calibrated.
Allows the control of the dry block temperature by using an external probe
(optional). The temperature calculation uses Callendar-Van Dusen coefficients.
Make no use of external standard thermometer.
Carries out completely automatic calibrations with or without the use of a
computer.
Accuracy to 0.1ºC 0.1% of reading, stability of 0.05ºC and resolution of 0.01ºC.
Documenting capabilities: communication with computer and ISOPLAN
Calibration Software.
Portable, compact, provide interchangeable inserts and carrying case.
It presents a wide variety of programming resources, allowing the performance of
automatic calibrations of thermocouples, RTDs, thermoswitches. In this case, the sensor
is placed in the insert and their electrical terminals are connected to the embedded
calibrator. The operator defines the calibration points and the number of repetitions, then
the process is started and all the sequence is automatically accomplished.
Another way of performing automatic documented calibrations is by means of
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 it is possible to
register sensors and instruments of a factory, generate work orders, create and print
calibrations certificates and reports, that is, it brings all advantages of computer data
management to the calibration environment.
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T-650PH 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 Fluorescent vacuum display to present big-size digit numbers.
Thermo-element 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, carrying case, strap and test leads included.
1.1 - Technical Specifications
Operating Range
from room temperature to 650 °C (1202 °F)
Power Supply
110Vac or 220Vac 50/60Hz,
according to order code.
Well Depth
124 mm
Resolution
0.01 °C (0.01 °F)
Accuracy Internal reference
with external probe
with external thermometer
0.1 °C 0.1 % of reading
0.10 °C
0.05 °C
Stability
(after 10 minutes)
0.05 °C
Power Consumption
1000 W
Heating Rate
20 minutes (50 °C to 650 °C)
Cooling Rate
21 minutes (650 °C to 200 °C)
Dimensions (H,W,D)
215 x 390 x 310 mm
Weight
9.0 kg
Warranty
1 year
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1.1.1 - Input Technical Specifications
Input Ranges
Resolution
Accuracy
Remarks
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
0.9 mA
Pt-100 -200 to 850 °C / -328 to 1562 °F
0.01 °C / 0.01 °F
± 0.1 °C / ± 0.2 °F
IEC-60751
Pt-1000 -200 to 400 °C / -328 to 752 °F
0.1 °C / 0.1 °F
± 0.1 °C / ± 0.2 °F
IEC-60751
Cu-10 -200 to 260 °C / -328 to 500 °F
0.1 °C / 0.1 °F
± 2.0 °C / ± 4.0 °F
Minco 16-9
Ni-100 -60 to 250 °C / -76 to 482 °F
0.1 °C / 0.1 °F
± 0.2 °C / ± 0.4 °F
DIN-43760
TC-J -210 to 1200 °C / -346 to 2192 °F
0.1 °C / 0.1 °F
± 0.2 °C / ± 0.4 °F
IEC-60584
TC-K -270 to -150 °C / -454 to -238 °F
-150 to 1370 °C / -238 to 2498 °F
0.1 °C / 0.1 °F
0.1 °C / 0.1 °F
± 0.5 °C / ± 1.0 °F
± 0.2 °C / ± 0.4 °F
IEC-60584
TC-T -260 to -200 °C / -436 to -328 °F
-200 to -75 °C / -328 to -103 °F
-75 to 400 °C / -103 to 752 °F
0.1 °C / 0.1 °F
0.1 °C / 0.1 °F
0.1 °C / 0.1 °F
± 0.6 °C / ± 1.2 °F
± 0.4 °C / ± 0.8 °F
± 0.2 °C / ± 0.4 °F
IEC-60584
TC-E -270 to -150 °C / -454 to -238 °F
-150 to 1000 °C / -238 to 1832 °F
0.1 °C / 0.1 °F
0.1 °C / 0.1 °F
± 0.3 °C / ± 0.6 °F
± 0.1 °C / ± 0.2 °F
IEC-60584
TC-N -260 to -200 °C / -436 to -328 °F
-200 to -20 °C / -328 to -4 °F
-20 to 1300 °C / -4 to 2372 °F
0.1 °C / 0.1 °F
0.1 °C / 0.1 °F
0.1 °C / 0.1 °F
± 1.0 °C / ± 2.0 °F
± 0.4 °C / ± 0.8 °F
± 0.2 °C / ± 0.4 °F
IEC-60584
TC-L -200 to 900 °C / -328 to 1652 °F
0.1 °C / 0.1 °F
± 0.2 °C / ± 0.4 °F
DIN-43710
1.2 - Order Code
1.3 - Accessories
Insert:
Inserts Holes
Order Code for
T-650PH
IN01
1 x 3/4"
06.04.0111-00
IN02
1 x 1/2"
06.04.0112-00
IN03
1 x 6.0mm and 3 x 1/4"
06.04.0113-00
IN04
3 x 6.0mm and 1 x 1/4"
06.04.0114-00
IN05
4 x 6.0mm
06.04.0115-00
IN06
2 x 6.0mm and 2 x 1/4"
06.04.0116-00
IN07
1 x 6.0mm, 1 x 8.0mm and 1 x 3/8"
06.04.0117-00
IN08
1 x 6.0mm, 1 x 3.0mm and 2 x 1/4"
06.04.0118-00
IN09
without hole, to be drilled by the client.
06.04.0119-00
IN10
Others, under ordering.
06.04.0120-00
Note: When asked, the calibration certificate will be provided for the first insert ordered.
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Communication Interface:
Description
Order Code
RS-232 - 9 way D type Connector (COM1)
06.02.1002-00
RS-232 - 25 way D type Connector (COM2)
06.02.1004-00
RS-485
06.02.1006-00
Soft Carrying Case. Order Code: 06.01.1020-00.
ISOPLAN Software.
Calibration Certificate.
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2 - T-650PH Calibrators Operation
The T-650PH calibrators keep the block temperature controlled and allow the
reading of a thermo-element connected to its terminals. It is possible to verify the
thermocouple, RTDs, temperature transmitters etc together with the block temperature
value and temperature set point.
The calibrators have 3 operating modes:
Manual Mode to select the block temperature straight from the keypad.
Programmable Mode: 6 different programs with 11 temperature setpoint values. The
block temperature is selected among the programmed values by the keys and .
The Programmable Mode with Timer scans automatically the temperature setpoints.
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.
IN EXEC
CONF CAL COM
The initial set point is 25.00 °C:
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 T-650PH calibrator adjust functions, protected by
password. More details in section 7 - Calibration.
COM: Accesses the automatic calibration parameters. It is possible to perform a
calibration without a computer or using it (via ISOPLAN software). More details in item
2.5 - Automatic Operating Mode.
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2.1 - Menu IN
mV OHM TC
RTD mA SW NO
mV, mA, SW: selects millivolt, milliampere or switch input, respectively.
OHM: selects ohms input. Following, choose from the menu the wiring in 2, 3 or 4-
wire.
2-WIRE 3-WIRE
4-WIRE
TC: selects thermocouple input. Choose among the J, K, T, E, Nand Ltypes. 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.
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2.1.1 - Input Connections Diagrams
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2.1.2 - External Probe Connection
Place the 4-wire Pt-100 standard sensor into the insert and plug the mini-DIN
connector to the external probe input (EXT. PROBE) located on the calibrator front panel, as
illustrated in the figure below:
The temperature control with the external probe must be enabled by the PRBe
option of the PRG menu. More details in item 2.2 - Menu CONF.
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2.2 - Menu CONF
CF PRG MEM LCD
SC BT DT BZ TU
CF: Selects the temperature unit between °C or °F. The ITS-90 or IPTS-68
temperature scales are selected for both the thermo-element and for the internal block
reference readings purpose.
°C-90 °F-90
°C-68 °F-68
LCD: This option sets the graphic liquid crystal display contrast. Use the keys 
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
Battery state
Display
4.0 to 7.0 V
normal
----------
< 4.0 V
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, 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 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 setpoint and
stabilizes.
ENDCAL: The buzzer beeps only at the end of a calibration in the
automatic operating mode.
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TU: Menu that configures the PID control parameters for the heating side. More
details in section 6 - PID Control Parameters.
K I D FACT
K: Proportional gain
I: Integral gain
D: Derivative gain
FACT: Restore the control parameters to the factory values.
PRG: Menu that programs the calibrator.
DEC_IN DEC_PRB
SP PRBe MD
DEC_IN: Selects the number of decimals of the thermo-element reading.
The default value depends on the input signal.
DEFAULT
0 1 2 3 4
DEC_PRB: Selects the number of decimals of the block temperature and
the setpoint value. The default number is 2.
0 1 2
SETPOINT: 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 6temperature 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 setpoint configuration.
10% 20% 25%
VARIABLE
Change the configuration to steps (STEPS) of 10%, 20%, 25%, VARIABLE or
press C/CE to maintain the configuration already stored in memory. The temperature
range of the program must be configured through the values in SETPOINT HIGH and
SETPOINT 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 setpoint, not
necessarily in ascending order.
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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
SETPOINT HIGH and SETPOINT LOW.
PRBe: This option enables the use of an external probe for the dry block
temperature control when selecting YES. In order to use the internal probe, select NO.
When enabling the external probe, configure the probe calibration parameters in the
PARAM menu and the temperature unit in CF as degrees Celsius or Fahrenheit. The
calibration parameters correspond to the R0, A, B, and C coefficients of the
Callendar-Van Dusen equation:
R(t) = R0{1 + A.t + B.t2+C.t3.(t –100 °C)}, C = 0 for t ≥0.
This equation is generally used in the IPTS-68 temperature scale, where t
refers to the temperature in this scale and R0to the resistance at 0 °C. However, it
can also be used in the ITS-90 scale.
The menu for the configuration of these coefficients is shown below:
R0 A B C
E_A E_B E_C
To enter the value of a coefficient, it must be split into a mantissa and an
exponent as it is used in scientific notation. For a C coefficient equal to -3.151052×10-2,
for example, type its mantissa (an integer and a fractional part with six digits) in the C
mnemonic and its exponent, as an absolute value, in the E_C mnemonic. In this way,
C= -3.151052 and E_C = 2.
Note that the signal can be inverted by pressing the key ZERO when the number
on the display is zero. This changes the signal from + to -, or vice-versa.
The coefficients for the ITS-90 scale according to the IEC-60751 standard are shown
below:
R0= 100.00000
A = +3.908300
E_A = -03
B = -5.775000
E_B = -07
C = -4.183000
E_C = -12
MD: Maximum deviation from the set point for the temperature control with an
external probe. The temperature is stabilized by the control after it enters in the range
limited by SET ± MD. This parameter must be configured as 1.0 °C.
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 °C or °F. 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.
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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
engineering unit of this signal. Next, configure the SCALE DEC (0-4), SCALE HIGH and
SCALE LOW parameters according to the maximum and minimum values of the
transmitter scale and the desired number of decimals. The scaled value is shown on the
display with the #unit.
For example, temperature transmitter with 0 to 100 °C input and 4 to 20 mA
output. The scaling with one decimal would be:
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 T-650PH calibrators allow 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.
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2.3 - Manual Operating Mode
The display shows the selected temperature value of the block and also the
current block temperature or thermo-element temperature value.
There are 4 ways in which the information are shown, covering the calibrator input
value (IN), the block temperature (PRBi or PRBe, measured with the internal or external
probe, respectively) and the temperature set point (SET). The key interchanges the
display presentation way:
IN = 23.456 mV
PRBi/PRBe = 25.01 °C
PRBi/PRBe = 25.01 °C
SET = 25.00 °C
23.456 mV
25.01
PRi/PRe
°C
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 setpoint.
The setpoint value is increased by key and decreased by key . While the
keys are kept pressed, the setpoint continues to be increased or decreased.
The key does not have function in the manual operating mode of the T-650PH
calibrators.
2.4 - Programmable Operating Mode
Pre-configured programs can be loaded 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 setpoint.
The display shows STEPn beside the block temperature setpoint value in the
programmable mode. The number of the program is indicated by n. Using the keys 
and , the programmed values of temperature setpoint 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 thermo-element 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.
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A countdown of the stabilization time is only started when the block temperature
reaches the programmed temperature and stabilizes within a range of approximately
0.15 °C. At this time the buzzer beeps, in case it is configured to YES.
2.5 - Automatic Operating Mode
The thermo-element calibration is performed in an automatic way by the T-650PH
calibrator. The configuration, as well as the calibration verification is carried out by the
calibrator 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 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
electric signal to be read. In this case, option IN from the menu must be configured to
NO and the calibrator will ask to enter the value indicated by the thermometer, at the end
of the stabilization time of 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
setpoint 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
above.
The automatic calibration begins when the option EXEC from menu COM is
selected. All the operations are automatically performed by the T-650PH calibrator. The
keypad does not work until the end of the calibration.
At the end of the stabilization time, the calibrator stores the thermo-element
reading in memory and goes to the next point, in case some input signal has been
previously 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 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
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readings 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 ISOPLAN 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 the ISOPLAN, 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 T-650PH
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 ISOPLAN software, configure ADDRESS to 1.
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3 - Recommendations as regards Accuracy of Measurements
PRESYS dry block temperature calibrators are instruments of high accuracy level,
requiring the observation of all the procedures described in this section, in order to
achieve the necessary conditions to get the accuracy levels during the calibrations.
Special attention should be paid in relation to the insert cleanliness. When necessary,
it should always be washed with water and soap, well rinsed and dried. Oil, grease,
solid particles can hinder the heat transference to the insert and even jam the insert
inside the block.
The sensor to be calibrated must fit snugly into the appropriate well. In case the
sensor is loose, the measurement accuracy meaning can be completely senseless.
The meaning of clearance between the sensor and the respective well should be
understood in a subjective way and the common sense is very important. Thus, the
sensor should enter the insert well (both completely clean) in such a way to stay
snugly enough so that it cannot move or swing inside but it should not enter by force
to get jammed.
3.1 - Getting a Better Accuracy from the Dry Block
The temperature control is based in the temperature measurement of an internal
sensor placed in the block.
This control probe is adjusted in factory by means of another sensor with high
accuracy (probe) connected to a superthermometer, as described in item 7.2 - Probe
Calibration. So, at factory, the accuracy of the superthermometer is transferred to the dry
block calibrator. The transference will be well performed only when there is perfect
temperature equilibrium between the internal control sensor and the 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 this technical
manual, in case one succeeds in reproducing the same conditions of the factory
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.
When a higher accuracy than that mentioned in the technical manual is
necessary, one should use an external superthermometer as a reference or standard to
compare with the thermo-element under calibration.
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 measurement.
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