Rechargeable Handheld Temperature Calibrator
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China [CN] 
1. Temperature difference measurement with accuracy of 0.003 ° C
PR231A calibrator measures the temperature difference between two points in space without other instruments. When the function is used, the four terminals of the source function be used as measurement terminals and the process of the temperature difference data acqusition can be completed within 0.4 Seconds, which effectively improves the accuracy of
the measurement. The stability can also be calculated in real time during the test
2.Standard temperature measurement
Different from ordinary TC and RTD measurement, the standard temperature measurement may use the certificate value for temperature traceability. The input signals include:STC - > S type, R type, B type, T type.SPRT-> Rtp = 25Ω or Rtp=100Ω.
3.Reference Junction Compensation
The reference junction compensation methods of the PR231 series calibrator are very flexible and three methods are available, namely internal, external, and customized. The external reference junction adopts Grade A Pt100, and can input the certificate value for the reference junction data correction. When PR231 series calibrator is combined with PR1501 temperature equalization compensation module, a reference junction compensation error of less than 0.07°C can be obtained.
4.Precision temperature control function
Using the precision temperature control function, temperature closed-loop control of the constant temperature equipment can be realized instead of the high-precision PID controller. In the case that the constant temperature equipment and grid voltage are satisfactory to the conditions, the temperature fluctuation of the equipment can be better than 0.02°C /10min (thermostatic bath).
5.ρvalue measurement
The PR231 series calibrator can measure the duty factor of the periodic square signal and can be used to verify and calibrate the PID parameters of various digital temperature indicating regulators for time proportional output, and meet the requirements of JJG 617-1996 Verification Regulation of Digital Temperature Indicators and Controllers.
6.Thermal calculator
It is used to achieve various conversions between electric and temperature. The conversion support a variety of TCs, RTDs and thermistors.
7. Value Settings
The PR231 series calibrator has the most flexible and convenient output value setting method. It is possible to directly set the output value through the numeric keypad, or to increase the increment setting by pressing the direction key. In addition, the device has an editable phase step or slope value setting method.
8.Sinusoidal signal output function
The verification/calibration of some process loggers, especially mechanical recorders, usually involves the operation test. In this case, the user can use the device's sinusoidal signal output function to provide signals for the verified instrument.
The verification/calibration of some process recorders (especially mechanical recorders) usually involves the operation of the test. At this time, the device's sinusoidal signal output function can be used to signal the meter.
9.Data logging function
The logging function saves measurement and output data. PR231 series calibrator has powerful record management functions. Up to 32 device numbers can be created. Each device number has 16 logging pages. Each logging page contains four kinds of basic information, namely time, measured value, output value and custom value. Basic information. Users can perform device processing, record deletion, etc. according to their needs.
| Item | PR231A-1 | PR231A-2 | PR231B-1 | PR231B-2 |
| Enhancement model | ||||
| Basic model | ||||
| 0.01 grade | ||||
| 0.02 grade |
| Weight | 990g | charging source | 100～240V AC,50～60Hz |
| Dimension | 225mm*130mm*53mm | Working temperature | -10℃～50℃ |
| Cell type | 7.4V 4400mAh, Rechargeable lithium battery | Working time | ≥20 hours(24V power off) |
| Preheating time | 10 minutes after preheating | Humidity | 0～80%,Non condensing |
| Charging time | 5 hours | Calibration period | 2 years |
1. Basic parameters of measurement:
| Function | Range | Measurement range | Resolution | 0.01 accuracy | 0.02 accuracy | Remarks |
| Voltage | 100mV | -5mV～120mV | 0.1uV | 0.005%RD+5uV | 0.015%RD+ 5uV | Input impedance ≥80mΩ |
| 1V | -50mV～1.2V | 1uV | 0.005%RD+ 0.005%FS | 0.015%RD+ 0.005%FS | ||
| 10V | -0.5V～12V | 10uV | Input impedance ≥1mΩ | |||
| 50V | -0.5V～50V | 0.1mV | ||||
| Current | 50mA | -5mA～50 mA | 0.1uA | 0.005%RD+0.005%FS | 0.015%RD+ 0.005%FS | Internal resistance =10Ω |
| Ohm | 50Ω | 0Ω～50Ω | 0.1mΩ | 0.005%RD+5mΩ | 0.015%RD+ 5mΩ | Output 1mA current |
| 500Ω | 0Ω～500Ω | 1mΩ | 0.005%RD+0.005%FS | 0.015%RD+ 0.005%FS | ||
| 5kΩ | 0kΩ～5kΩ | 10mΩ | Output 0.1mA current | |||
| Thermal couple | S,R,B,K,N,J,E,T,EA2,Wre3-25,Wre5-26 | 0.1℃ | / | According to ITS-90 scale | ||
| Cold end compensation | Internal | -10℃～60℃ | 0.01℃ | 0.5℃ | 0.5℃ | |
| External | 0.1℃ | 0.1℃ | ||||
Thermal resistance | Pt10,Pt100, Pt200,Cu50,Cu100,BA1,BA2,JPt100, Pt500, Pt1000 | 0.01℃ | / | |||
| Standard temperature | S,R,B,T,SPt25,SPt100 | 0.01℃ | / | Need to enter the correction value | ||
| ρ-value | 50S | 0.001%～99.999% | 0.001% | 0.005% | 0.005% | Input pulse width amplitude range:1V～50V |
| Frequency | 10Hz | 0.001Hz～12Hz | 0.001Hz | 0.01%FS | 0.01%FS | |
| 1kHz | 0.00001kHz~ 1.2 kHz | 0.01Hz | ||||
| 100kHz | 0.01kHz～ 120 kHz | 10Hz | 0.1%FS | 0.1%FS | ||
| Temperature difference | S,R,B,K,N,J,E,T | 0.01℃ | / | Need to enter the correction value | ||
| SPt25,SPt100 | 0.001℃ | |||||
2. Basic parameters of the output function:
| Function | Range | Measurement range | Resolution | 0.01 accuracy | 0.02 accuracy | Remarks |
| Voltage | 100mV | -20mV～120mV | 1uV | 0.005%RD+5uV | 0.015%RD+5uV | Maximum load current =2.5mA |
| 1V | -0.2mV～1.2V | 10uV | 0.005%RD+0.005%FS | 0.015%RD+0.005%FS | ||
| 10V | -2V～12V | 0.1mV | ||||
| Current | 30mA | -5mA～30 mA | 1uA | 0.005%RD+0.005%FS | 0.015%RD+0.005%FS | Maximum load voltage =24V |
| Ohm | 50Ω | 0Ω～50Ω | 0.1mΩ | / | According to ITS-90 scale | |
| 500Ω | 0Ω～500Ω | 1mΩ | ||||
| 5kΩ | 0kΩ～5kΩ | 10mΩ | ||||
| Thermal couple | S,R,B,K,N,J,E,T,EA2,Wre3-25,Wre5-26 | 0.1℃ | / | |||
Thermal resistance | Pt10,Pt100, Pt200,Cu50,Cu100,BA1,BA2,JPt100, Pt500, Pt1000 | 0.01℃ | / | |||
Frequency / Pulse | 10Hz | 0.001Hz～ 12 Hz | 0.001Hz | 0.01%FS | 0.01%FS | Maximum load current =2.5mA |
| 1kHz | 0.00001kHz～ 1.2 kHz |
0.01Hz | ||||
| 100kHz | 0.01kHz～120 kHz | 10Hz | 0.1%FS | 0.1%FS | ||
| Precision temperature control | S,R,B,K,N,J,E,T | 0.01℃ | / | |||
| Pt100 | ||||||
| 24V output | Maximum voltage error: 0.3V Ripple noise:35mVp-p(20MHz bandwidth) Maximum load current:70mA Load regulation: 0.5%(10% -100% load change) | |||||
1. Measuring function terminal area (withstand 100V DC voltage input error)
2. Output function terminal area(withstand 36V DC voltage input error)
3. Dust cover
4. Side band(length adjustable )
5. Holder
6. External Pt100 Reference point sensor interface
7. USB2.0 communication interface
8. Multi-function port (With RS232 communication, USB communication, isolated 24V voltage output, precision temperature control signal output, pressure calibration, and other functions)
9. Reset
10. Supply hub(Connect the external AC power adapter)
11. Equipment nameplate
12. Battery
13．Protective tube
14．Screen contrast adjusting knob
15．Battery port
a．Adjust length here
b．Unfold jacket toward this direction
c. Holder unfold direction
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