Presys T-25N Technical Manual
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Presys T-25N Technical Manual

Dry block
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Summary of Contents for Presys T-25N

  • Page 2 WARNING! Avoid electric shock risk on touching the equipment: -Use only suitable power cable with earth connection; -Never power the equipment to the mains socket with no earth connection. WARNING! High voltage is present inside this equipment. It can cause great damages and injuries.

  • Page 3: Table Of Contents

    1.1.1 - Input Technical Specifications ................ 3 1.2 - Order Code ......................3 1.3 - Accessories ......................3 2 - T-25N Calibrator 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 ......................

  • Page 4: Introduction

    PRT sensor (optional) placed in the insert together with the sensors to be calibrated. The sensor calibration curve is configured according to the Callendar-Van Dusen parametrization.  T-25N calibrator model generates temperatures from -25 ºC to 125 ºC (-13 ºF to 257 ºF).  Presents input for thermocouples, thermoresistances, thermoswitches. Besides generating temperature, it measures the signal from the sensor being calibrated.

  • Page 5: Technical Specifications

    T-25N 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.

  • Page 6: Input Technical Specifications

    PRESYS  Instruments T-25N 1.1.1 - Input Technical Specifications Input Ranges Resolution Accuracy Remarks millivolt -150 to 150mV 0.001mV ± 0.01% FS > 10M  input -500 to -150mV 0.01mV ± 0.02% FS auto-ranging 150 to 2450mV 0.01mV ± 0.02% FS -5 to 24.5mA...
  • Page 7 PRESYS  Instruments T-25N  Precision Temperature Sensors: Description Order Code Probe 1/5 DIN straight – mini-DIN connector 04.06.0001 - 21 Probe 1/5 DIN 90º bend – mini-DIN connector 04.06.0007 - 21  Communication Interface: Description Order Code RS-232 - 9 way D type Connector (COM1) 06.02.1002-00...

  • Page 8: T-25N Calibrator Operation

    T-25N 2 - T-25N Calibrator Operation The T-25N 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 setpoint.

  • Page 9: Menu In

    PRESYS  Instruments T-25N 2.1 - Menu IN  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.

  • Page 10: Input Connections Diagrams

    PRESYS  Instruments T-25N 2.1.1 - Input Connections Diagrams Page 7...

  • Page 11: External Probe Connection

    PRESYS  Instruments T-25N 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.

  • Page 12: Menu Conf

    PRESYS  Instruments T-25N 2.2 - Menu CONF  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...
  • Page 13 PRESYS  Instruments T-25N DEC_IN: Selects the number of decimals of the thermo-element reading. The default value depends on the input signal.  DEFAULT DEC_PRB: Selects the number of decimals of the block temperature and the setpoint value. The default number is 2.
  • Page 14 SCALE DEC (0-4): 1 SCALE HIGH: 100.0 # SCALE LOW: 0.0 # MEM: The T-25N 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 Page 11...

  • Page 15: Manual Operating Mode

    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-25N calibrator. Page 12...

  • Page 16: Programmable Operating Mode

    0.05 ºC. 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-25N calibrator. The configuration, as well as the calibration verification is carried out by the calibrator itself.
  • Page 17 The automatic calibration begins when the option EXEC from menu COM is selected. All the operations are automatically performed by the T-25N 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.

  • Page 18: Recommendations As Regards Accuracy Of Measurements

     In the specific case of generating negative temperature with the T-25N model, the calibrations should be performed in a descending temperature order. This procedure is useful because in negative temperatures ice is formed in the insert surface and between the insert and the thermo-element being calibrated.

  • Page 19: Recommendations To Other Types Of Insert

    PRESYS  Instruments T-25N 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.

  • Page 20: Safety Instructions

    EEPROM ERROR Problem in EEPROM Same as the previous item READ MANUAL memory Level of battery voltage is Check the T-25N calibrator LOW BATTERY power supply Input signal out of See item 1.1.1 on Input UNDER / OVER specifications or scaling...

  • Page 21: Calibration

    PRESYS  Instruments T-25N 6 - 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 main menu and press the ENTER key. You should then enter the password (PASSWORD) 9875 to access the calibration menu.

  • Page 22: Probe Calibration

    PRESYS  Instruments T-25N a) Application of mV signal: For the calibration below, leave terminals RTD3 (+) and RTD4 (+) short-circuited. mV Signal Terminals point point V_OHM3 RTD3(+) and mV(-) 90.000 mV 120.000 mV V_OHM4 RTD4(+) and mV(-) 90.000 mV 120.000 mV...

  • Page 23: Instructions For Hardware Maintenance

    7 7 - Instructions for Hardware Maintenance There are no parts or components in the T-25N temperature calibrator that can be repaired by the user. Only the 6Amp fuse, placed within the socket on the rear can be replaced by the user.

  • Page 24: Tiny Steel Balls, Recommendations Of Use And Safety Instructions

    The dry block calibrators are offered including a plastic container with tiny steel balls. This item is an exclusive accessory of PRESYS dry block calibrators, which also provide a cup-like insert that is an insert drilled with the maximum allowed diameter (3/4”), proper for being filled with the tiny balls.
  • Page 25 www.presyscorp.com...

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