GAOTek Process Calibrator With Auto Power Off (TC, RTD signals)

Acquainting the Process Calibrator

The keys and ports distribution of calibrator is shown in the following picture.

Top ports / Bottom ports

The following table is the wiring instructions of port function.

The key of calibrator is shown as follows. The following table is the explanation of their functions.

Basic Operation

1. Configuration menu function

There are ten items of setting in configuration menu. Press “CONFIG” to enter into. Press EXIT to exit.

Setting 1. Adjusting the time to power-off. (The calibrator will power off after the setting time when there is no any operation.) The factory default value is 20 minutes. The detail operation step and explanation are as follow.

1. Press “CONFIG” it shows “power off time XX minutes” in the upper part of screen. The unit is minute.
2. Press up or down direction key, to increase or reduce the power-off time, range: 0-60 minutes. When the power-off time is setting as 0, the calibrator will cancel auto power-off. Then it can only be powered off manually.
3. Press CONFIG, enter into the next level setting. Press EXIT to exit configuration menu.

Setting 2. Adjusting screen contrast. Factory default is 09. The detail operation step and explanation are as follow.

1. Press CONFIG, keep pressing and select setting 2. It shows “Screen contrast XX” in the upper part of screen.
2. Press up or down direction key, to increase or reduce the number in the screen, range: 0-16. When the number gets larger, the content in the screen gets weaker. When the number gets smaller, the content in the screen gets darker.
3. Press CONFIG, enter into the next level setting. Press EXIT to exit configuration menu.

Setting 3. Adjusting the delay time of back light (The calibrator will turn off the back light after the setting time when there is no any operation). Factory default value is 5 minutes. The detail operation step and explanation are as follow.

1. Press CONFIG, keep pressing and select setting 3. It shows “Turn-off time of back light XX minutes” in the upper part of screen. The unit is minute.
2. Press up or down direction key, to increase or reduce the turn-off time of back light, range: 0-20 minutes. When the turn-off time is setting as 0, the calibrator will cancel auto turn-off. Then it can only be turned off manually by pressing BL key.
3. Press CONFIG, enter into the next level setting. Press EXIT to exit configuration menu.

Attention: It can save the battery and increase the using time to set the turn-off time of back light shorter.

Setting 4. Setting calendar and time. The detail operation step and explanation are as follows.

1. Press CONFIG, keep pressing and select setting 4. It shows “Calendar time setting: XX year” in the upper part of screen. The unit is year.
2. Press up or down direction key, to increase or reduce year, range: 00-99 year.
3. Press ENTER, enter into the setting of month, and continuously set date, hour, minute and second.
4. Press CONFIG, enter into the next level setting. Press EXIT to exit configuration menu.

Setting 5.Setting temperature unit. The factory default is ℃. . The detail operation steps and explanation are as follows.

1. Press CONFIG, keep pressing and select setting 5. It shows “Setting temperature unit: ℃” in the upper part of screen.
2. Press up or down direction key, to select ℃  or ℉  circularly. When the temperature unit is changed, the unit in measurement and output TC or RTD function will also be changed.
3. Press CONFIG, enter into the next level setting. Press EXIT to exit configuration menu.

Setting 6. Setting HART. The factory default is OFF. The detail operation step and explanation are as follows.

1. Press CONFIG, keep pressing and select setting 6. It shows “Setting HART: OFF (ON)” in the upper part of screen.
2. Press up or down direction key, to select ON or OFF circularly. If select “ON”, select output current (mA) in the bottom of screen and series 250Ωresistance, it shows “HART” in the bottom of screen.
3. Press CONFIG, enter into the next level setting. Press EXIT to exit configuration menu.

Setting 7.Setting cold junction compensation. The factory default is OFF. The detail operation step and explanation are as follows.

1. Press CONFIG, keep pressing and select setting 7. It shows “Cold junction compensation: OFF (ON)” in the upper part of screen.
2. Press up or down direction key, to select ON or OFF circularly. If select “ON”, it automatically does cold junction compensation in measurement or output TC function in the bottom of screen. It shows “CJC XX.X”in the bottom of screen, XX.X means the temperature of current cold junction compensation.
3. Press CONFIG, enter into the next level setting. Press EXIT to exit configuration menu.

Setting 8.Calibrating the temperature of cold junction compensation.

Put the calibrator in the calibration environment for 10 minutes before starting the calibration. Start to calibrate when the temperature inside the instrument is as same as it in the environment. The temperature has better been around ten ℃ .

The environmental measurement thermometer with accuracy ±0.2℃ should be used as standard. The detail operation step and explanation are as follows.

1. Press CONFIG, keep pressing and select setting 8. It shows “Cold junction compensation: XX.X℃” in the upper part of screen.
2. Press up or down direction key, to increase or reduce the number in the screen. Adjust the temperature in the screen as same as the value in standard environmental measurement thermometer.
3. Press CONFIG, enter into the next level setting. Press EXIT to exit configuration menu.

Setting 9. System calibration turns on or off. The factory default is (OFF. The detail operation step and explanation are as follows.

1. Press CONFIG, keep pressing and select setting 9. It shows “System calibration setting: OFF (ON)” in the upper part of screen.
2. Press up or down direction key, to select ON or OFF circularly. If select “ON”, turn on the system calibration. Otherwise, turn off the system calibration.
3. Press CONFIG, enter into the next level setting. Press EXIT to exit configuration menu.

Setting 10. Language selection. The detail operation step and explanation are as follow.

1. Press CONFIG, keep pressing and select setting 10.
2. Press up or down direction key, to select Chinese or English circularly.
3. Press CONFIG, enter into the next level setting. Press EXIT to exit configuration menu.

2. Data store and recall.

Data store is to save the measurement or output (analog) data in the bottom of screen. The calibrator can save 8 packs of data in the NVM (nonvolatile memory) for recall in the future. The stored data will not lose after powering off the calibrator. The detail operation step and explanation are as follow.

• Press STORE to enter into data store function. It shows “STORE” and address number “1…8” in the right up corner of screen, total 8 addresses. The current store address number will blink.
• Keep pressing STORE and select store address number circularly. If there is already been data in this address number, it will be shown with black in the screen. If saving data here, the current data will be replaced.
• Press ENTER key, confirm to save data in current selected place. The next data store address number will start to blink.
• Press EXIT, exit the data store function.

Data recall is to display the data in the NVM (non-volatile memory), output with output (analog) data. The detail operation step and explanation are as follow.

• Press RECALL to enter into data recall function. It shows “RECAL” and address number “1…8”of data recall in the right up corner of screen, total 8 addresses.

The current data recall address number will blink.

• Keep pressing RECALL and select data recall address number circularly. If there is already been data in this address number, it will be shown with black in the screen.
• Press ENTER key, confirm to recall the data in current selected place. The next data store address number will start to blink.

4)   Press EXIT, exit the data recall function.

3. Back light of screen

Press BL, turn on the back light. It will automatically turn off after the appointed delay time or press BL again to turn it off. The delay time can be set, the default value is 5 minutes.

Measurement functions

A. Measurement functions in the upper part of screen.

1) To measure the voltage of transmitter, please operate as following steps.

① Press V (1), select voltage measurement. The red and black probe connects to V/LOOP and COM port separately.

②Observe the reading in the upper part of screen, like over range “-OL–”.

The maximum measurement value is 30 V. Attention: Do not connect the high voltage over the range to any end of the ports. It may damage the instrument.

2) To measure the current of transmitter, please operate as following steps.

① Press mA (2), select current measurement. The red and black probe connects to mA and COM port separately.

② Observe the reading in the upper part of screen, like over range “-OL–”. The maximum measurement value is 24 mA. Attention: Do not connect the current over the range to any end of the ports. It may damage the instrument.

3) To measure the current with loop power supply LOOP

The LOOP function start a 24 V power supply connects in series with current measurement circuit. It can achieve the function to power up the transmitter and measure the current output of transmitter after the wiring is removed in site. If to use LOOP to measure current, please operate as following steps.

① Press LOOP (3) when the calibrator is in other measurement mode, it shows “LOOP” in the upper part of screen. Then the calibrator provides 24 V loop power supply internally.

② The red and black probe connects to V/LOOP and COM port separately.

Observe the reading in the upper part of screen, like over range “-OL–”.