1.Overview of the Products
TWY Series Precision Digital Pressure Gauge is the latest intelligent high-accuracy pressure gauge which were researched and developed by our company: Creat Wit. TWY digital pressure gauge is mainly composed of the pressure sensor and the circuitry of the signal processing. Pressure sensor adopted the imported sensor which is superior performance, such as high accuracy, corrosion resistance, impact resistance, anti-vibration, high stability and so on; signal processing circuitry adopted the latest ultra-low-power processors, signal processing chip and power management chips; using large-capacity and high-performance lithium battery power supply. This small-size instrument looks nice and quite easy to operate.
According to the pressure performance, TWY digital pressure gauge can be divided into three, which are vacuum, positive pressure and hydraulic.
According to the pressure range, it can be divided into: micro-pressure, low-pressure and high pressure. It is mainly applied in a variety of metrology departments for calibrating various differential pressure transmitter, pressure transmitter, pressure meters and some other pressure calibration equipments.          
 
2.Technical Parameters
1.Measure range:（-0.09~100）MPa.
2.Signal output: 4-20mA.
3.Accuracy level: Level 0.25, 0.4, 0.5.
4.Display: 4 digits dynamic display + analog light display.
5.Overload pressure: more than 1.2 times range.
6.Turn-off current: less than 20μA.
7.Power supply: 3.6V large-capacity Li battery (life from 2~3 years).
8.Media temperature: -45℃~120℃.
9.Work environment:
  Temperature: -20℃~60℃;
  Humidity: ≤85%RH;
  Reference environment correction: 20℃±2℃.
10.Temperature compensation range: 0℃~50℃
11.Explosion protection grade: ExiaⅡCT4.
12.Protection grade: IP65.
13.Process connection: M20 × 1.5 (male thread); please specify if ordering other size.

3.Operation introduction of the instruments panels and keys

Functions under the sampling process:
"Switch" key: turn on and off the machine. The instrument can be closed if we do not use; in doing so, power consumption can be reduced. Scanning this key, the starting point and the full measure range point of this instrument can be displayed within 2 seconds; the instrument is under measuring mode at this moment. Again, scanning this key for 2 seconds, the instrument comes into shutdown mode.
“Set” key: there are two functions about this button, which are “Peak Value Keeping” and “Unit Exchange”. If “Peak Value Keeping” is required, scan “Set” key, and the instrument will display only the maximum value of the pressure. If “Unit Exchange” is required, please scan the “Set” key, it can easily exchange the units between KPa and MPa (and so on) according to the requirement of the customers. If the unit exchange is not necessary, scan the “scan” key again and exit. Then the instrument is ready to work. (The two functions: “Unit Exchange” and “Peak Value Keeping” are able to work only according to the requirement from the customers). 

 "Zero" key: correct the numbers (error zero) to zero. When incorrect zero of the instrument occurs (because of the temperature changing), just scanning this key, it can correct the zero-pressure automatically. Scanning the button, "CAL-0" can be displayed and the instrument can calibrate the zero automatically. This system can save and exit calibration in 2 seconds. If it displays “ERROR” after scanning this button, it means there is error occurring on this instrument.

4.Usage
(1) This is an essential safe explosion-proof instrument without other essential safe equipments connected.
(2) After opening the box, check the instruction, attachment and certificate; also make sure it is the correct specification compared to the nameplate.
(3) Please read the instruction carefully before installation; calibrate and check the instrument carefully according to the technical indicators.
(4) Install and operate strictly according to the requirements in the instructions.  
(5) Forbidden to change or remove any components and structures which may affect the safe explosion-proof, such as the electronic batteries and the related components. 
(6) Switch off the power when the instrument is not working, in doing so the battery life can be extended.
(7) There should be good ventilation environment when users replace the batteries; make sure there is no gas leaked and use the same model batteries.

5. Installation Requirement
1.Because of the high-accuracy metrology equipment, this instrument should be maintained and operated under the good ventilation area which is easy to observe.
2.TWY series metrology instrument should be installed perpendicularly to the ground because of the high-accuracy.
3.When install TWY series high-accuracy digital pressure gauge, it is necessary to install another seal copper backing.
4. This series of instruments are able to use together with the table-type pressure pump (Pay attention to the matches of pressure range).

6.Storage and Transportation
1. This product should be stored in the environment of -40 ℃ ~ +80 ℃ temperature and less than 90% relative humidity; And make sure there is non-corrosive gas.
2. The product is collected in one package together with the certificate, instructions and the test report. There should be non-strong collision during the whole transport process.
7.Order Instructions and Technical Services
1. In order to select the appropriate structure range, when ordering, the users need to provide the pressure measurement range, the accuracy requirements, the type of signal output, and any other special requirements.
2. Because of the personal problems of the products, if digital pressure gauge does not work, our company is responsible for one year free repair or replacement.
3. In order to ensure the users’ repair and maintenance, our company provides the software update services on various accessories and digital pressure gauge.

8.Notice of Usage
(1) When the real pressure value is “0”, but the display is not “0”, in order to get the correct measurement, please click “reset” to do “zero-correction”. If it still displays “ERROR”, it means the instrument is destroyed.
(2) Before installing the digital gauge on the equipment, please check whether the gauge is clean; keep the pipeline clean during the operation process.
(3) Although the overload pressure allowance is 1.5~2 times during the whole operation process, the period can not be too long in order to ensure the measure accuracy.
(4) Charging guidelines: if the digital gauge is chargeable, please switch off the power when charging; the charging time is 3~4 hours.

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