1、 Overview
1. TX-YBS-WB precision digital pressure gauge is a portable instrument that can be used for both AC and DC. It can measure current while measuring pressure and is equipped with a 24VDC output. (One meter with multiple ranges, capable of connecting multiple pressure modules to a single host and possessing basic functions).
2. High performance microprocessors enable the instrument to be used over a wide temperature range for a long period of time without affecting its measurement accuracy.
3. Low power consumption. Adopting imported nickel hydrogen high-energy batteries to ensure the instrument operates normally for a long time.
4. Constant current charging, with automatic shutdown and protection functions for overcharging and undervoltage of battery voltage, ensures that the battery is not damaged due to overcharging or undervoltage, and has a long service life (due to long-term disuse, charge once every three months until the green light is on).
5. The undervoltage automatic protection function of low-power consumption ensures that the instrument will not damage the battery due to undervoltage even if the operator continuously turns it on for too long due to reasons.
6. The instrument has rich range functions, one meter is versatile, and has multiple display styles, which can simultaneously display pressure and current; Pressure, millimeter water column, percentage of pressure, kilograms, and current.
7. The software has rich content, simple and clear operation.
8. The instrument has an over range alarm function. When the applied pressure reaches the rated full range+2500 amperes, the instrument will display OVERRANGE! P， And the built-in buzzer will intermittently sound, indicating that the pressure exceeds the full range. The pressurization should be stopped and some of the pressure should be removed to keep it within the specified range to avoid damaging the pressure sensor. The tested current value exceeds 22mA, and the instrument also displays OVERRANGE! I, and the built-in buzzer will intermittently sound.
9. Adopting thin film panels and imported tactile switches, the style is novel and the button life is long.
10. LCD with backlight display, intuitive, clear, compact and reasonable structure; Small in size, lightweight, and easy to carry.
11. Operate and calibrate the full range directly on the panel.
12. Portable metal casing, strong anti-interference, sturdy and impact resistant.
2、 Purpose:
TX-YBS-WB precision digital pressure gauge can be used not only as a high-precision calibration standard (meter), but also as a working instrument, widely used in metallurgy, petroleum, chemical, power, natural gas, metrology, and scientific research departments.
3、 Working principle

2 Working principle:
a: Pressure: The measured medium is subjected to pressure from a pressure tube on a solid-state (silicon diaphragm) sensor. When the pressure changes, the resistance of the diffused silicon diaphragm changes under the pressure resistance effect. This change is detected as an electrical signal and converted into a voltage signal proportional to the pressure through a circuit. The signal is then converted into a digital signal by an analog-to-digital converter and processed by a microprocessor to display the numerical value of the measured medium pressure on an LCD display.
B current: Insert a random pair of probes into the corresponding holes on the instrument panel, and turn the instrument to the current mode to measure.

4、 Technical indicators
1. Pressure range: -95kPa~60MPa (various levels)
2. Resolution: Pressure: Min 1Pa
Current: Min 1uA
3. Current measurement range: 0~22mA
4. DC output: 24VDC
5. Accuracy: Pressure: 0.1% F.S 0.05% F.S
Current: 0.05% ± 1d
6. Environmental temperature: 5-50 ℃
7. DC working time: ≥ 16 hours
8. Display: 41/2LCD 51/2LCD
9. Relative humidity: ≤ 80% RH
10. Overload capacity: 1.2-1.5 times the upper range limit
11. Dimensions: 290 * 250 * 105mm (length * width * height)
12. Weight: 2200g
13. Power supply and power consumption: 220VAC 50Hz 3VA
5、 Usage operation
1. Power on, key: Press the "on" button to turn on the instrument power, and the LCD displays the instrument measurement status; Press the "and" button to turn off the instrument panel and cut off the power supply.
2. Zero calibration button: Before measurement, press this button once, and the instrument will automatically collect the zero value of the sensor and send it to the CPU for processing, ensuring that the data measured by the instrument is the actual pressure value.
3. Pressure Health: If the LCD displays the measurement status of pressure and current, press this button once to switch the instrument to display "KPa, mmH2O" or "MPa (Kg)" simultaneously.
4. Current button: When the instrument current needs to be detected, press this button once, and the LCD will display the measured value. Press this key repeatedly to switch between pressure, current, and current percentage.
5. Backlight button: works in low light environments. Press this button once to turn on the backlight for easy reading.
6. Detecting transmitter: The instrument is equipped with a 24VDC power output. When detecting the transmitter, simply turn on the instrument to the current mode, insert the red probe into the "24V OUT MAX30 mA" hole, and insert the black probe into the "mA IN MAX20 mA" hole to directly connect with the "+" and "-" poles of the transmitter to detect the transmitter. If the 24V output voltage of the instrument is not required, the red and black probes can be directly inserted into the "mA IN MAX20 mA" and "COM" and connected in series to the 24V voltage regulator, and then directly connected to the transmitter to detect the transmitter.
7. Pressure and current full-scale calibration:
(1) Pressure full-scale calibration: If the instrument displays "Kpa (MPa)" and "mA", press the "pressure button" to switch the instrument display to both "Kpa (MPa)" and "mmH2O (kg)" display states. After pressurization to full range stability, press the "pressure and current buttons" at the same time. At this time, the first line of the LCD screen displays the measured pressure value in the second line of FS ADJ B, indicating that the pressure full-scale calibration state has been entered. At this point, simply press the "backlight button" to calibrate and automatically exit the full-scale calibration program, entering the normal measurement state.
(2) Full range calibration of current: Press the "current button" to switch the display to both mA and% display states. Add a stable DC20.000mA standard signal between mA IN and COM, and press the "Pressure, Current" button at the same time. At this time, the first line of the LCD display screen shows: FS ADJ B. The second line shows the measured current value, indicating that the current has entered the full range calibration state. At this point, simply press the "backlight button" to calibrate the automatic output and exit the full-scale calibration program, entering the normal current measurement state.
6、 Precautions
1. When the charging indicator light changes from red to green, stop charging the battery. Long term charging can easily damage high-energy batteries.
2. If the instrument is not used for a long time, it should be charged once every three months.
3. The instrument has sufficient overload capacity, but if it exceeds 1.5 times the overload capacity, there is a possibility of permanent damage to the sensor.
4. The silicon diaphragm of the pressure sensor is very thin; Do not allow solids, particles, or other hard objects to enter the sensor. Please indicate this in the order contract.
5. Without specialized testing skills and specialized testing equipment, do not open the hood for maintenance at will, and do not adjust or replace components, otherwise the accuracy of instrument measurement cannot be guaranteed.
6. Do not let other heating elements such as soldering irons get close to the display screen and housing. 7. Although the instrument has seismic design, it should still be handled with care, especially when used on site, to avoid falling or colliding.
8. The internal sealing material of sensors for instruments above 600KPa is nitrile rubber. Do not come into contact with corrosive solvents such as engine oil.
Storage and use
Avoid storing and using instruments in the following locations
1. The humidity is very high
2. Near high temperature heat source
3. There is strong vibration present
4. Corrosive gas
5. Strong magnetic field region
6. Near the large rotating motor