1、 Product Overview:
OW-JF4 Thermal Handbook can verify or simulate pressure transmitters, differential pressure transmitters, vortex flowmeters, thermocouples, and thermal resistors, and can provide on-site instrument power distribution and quick access to complex thermal manuals. The OW-JF4 Thermal Power Handbook uses a 16 bit microcontroller as the CPU, integrating the latest large-scale digital conversion integrated circuit and large screen LCD display technology. It has output, measurement, manual, and 24VDC power distribution functions, and all four functions can work simultaneously. It is also equipped with a large capacity rechargeable battery for easy carrying, making it an excellent configuration for thermal instrument industry personnel to maintain and debug on site.
2、 OW-JF4 Thermal Code Features:
1. Compact, easy to carry and hold.
2. Durable and reliable, the support frame and hook holes on the back are suitable for on-site use.
3. Large display screen, capable of displaying measurement, output, and thermal manual data simultaneously.
4. It can measure voltage, current, frequency, thermocouple, platinum resistance, copper resistance, and ordinary resistance.
5. It can output signals such as voltage, current, millivolts, frequency, etc. 24V DC distribution output provides loop power for the transmitter.
6. The thermal manual enables quick cross checking of resistance values and temperature values, millivolt values and temperature values, and enables quick querying of saturated steam pressure and density, temperature and density.
7. Equipped with backlight control function to meet nighttime use.
3、 OW-JF4 Thermal Code Parameters:
◆ Output signal:

Measurement signal:
① Current: 0~35mA DC Accuracy: ± 0.05% FS
② Voltage: 0~5V DC Accuracy: ± 0.05% FS 0~35V DC Accuracy: ± 0.1% FS
③ Millivolt: 1.10-1000mV DC Accuracy: ± 0.05% FS
④ Resistance: 0.0~1200.0 Ω Accuracy: ± 0.05% FS
⑤ Frequency: 0.0~5000.0Hz (square wave) Accuracy: ± 0.2Hz
Thermal Manual (Implementing International ITS-90)
① Realize the mutual check of resistance value and temperature value. (Referring to Pt10 and Pt100 type thermistors).
② Realize the mutual check between millivolt value and temperature value. (Referring to S, K, B, R, J, E, T, N-type thermocouples).
③ Realize the query of pressure (P) and density (ρ) and temperature (T) of saturated steam. Query range: Absolute pressure range: 0.1MPa~16MPa; Temperature range: 100 ℃~350 ℃.
◆ Power supply:
This instrument is equipped with a large capacity rechargeable battery with a capacity of 10800mAh. It can be charged with an external power supply of DC12V and 1.0A for 8 hours each time. The red light on the Baodian panel lights up during charging, and the green light lights up after charging is completed. While charging, Baodian can still function normally. After a single charge, it can work normally for 8-16 hours, depending on its usage status.
◆ Environmental temperature: working temperature -10~50 ℃, storage temperature -20~70 ℃
4、 Panel and keyboard operations:
Press the "↓" key to switch between output, measurement, and manual functions.
Press the "→" key to switch between current, voltage, millivolts, and frequency options.
Press the 'ENT' key to confirm.
Press the "" key to achieve specific value output for the output function, and switch the manual function in reverse.
Simultaneously press the "↓" and "ENT" keys to switch between backlight on and backlight off.
◆ Usage steps
1. Power on
At the beginning of turning on the power, the LCD screen displays "Universal Instrument" and then enters the work homepage. Preheat for 10 minutes
It can enter the working state, and the initial function is shown in the figure: at this time, the cursor is at "output current".

2. Signal output
If the user needs to output an 80mV signal, they can switch to the "Output Millivolts" option by pressing the "→" key. Enter the "80" character on the keyboard and press the "ENT" key to confirm. Insert the red and black probes into the mV signal output and COM jack respectively to obtain the 80mV signal.
3. Signal measurement
If users need to measure frequency signals, they can press the "↓" key to move the cursor to the "Measure Voltage" item, and then use the "→" key to switch to the "Measure Frequency" option. Insert the red and black probes into the F signal input socket and COM socket respectively to read the measured frequency signal.
4. Manual inquiry
If the user needs to query the resistance value of Pt100 thermistor at 200 ℃, first press the "↓" key to move the cursor to the "Manual" item, press the "→" key to switch to the Pt100 option, enter the "200" character, and press the "ENT" key to find the corresponding resistance value; At this time, pressing the "" key can reverse the query. After entering the "100" character, the temperature value corresponding to the Pt100 type thermistor with 100 Ω can be queried.
The backlight control extends the working time after charging, and the instrument is designed with two states of backlight on and off. The default state is backlight off. If users need to turn on the backlight to increase display brightness, they can simultaneously press the "↓" and "ENT" keys to turn on the backlight. If you press the "↓" and "ENT" keys simultaneously, the backlight will turn off.
Note: Maximum current measurement ≤ 50mA;
The maximum voltage measurement is ≤ 50V; the positive and negative terminals of the voltage measurement must be correct.