1. Product Overview
The INFURIDER YF-189A is a high-precision digital differential pressure gauge designed for measuring positive, negative, and differential pressure. It features a large LCD screen with backlight for clear readings in various lighting conditions. This device is suitable for a wide range of applications including HVAC systems, air conditioning, ventilation, gas measurement, and laboratory research.
Key Features:
- High accuracy: ±0.3%FS with 0.001 resolution.
- Wide measurement range: ±2psi or ±13.79Kpa.
- 11 selectable pressure units: mmHg, inHg, ftH₂O, cmH₂O, inH₂O, KPa, mbar, bar, psi, Kgcm², ozin².
- Multi-functional modes: Data Hold, Differential (DIF) mode, Record (REC) mode for MAX/MIN/AVG values.
- Automatic shutdown after 25 minutes of inactivity to conserve battery life.
- Dual ports for connecting 4mm diameter hoses to test gas pressure in two containers.
Figure 1: Front and side view of the INFURIDER YF-189A with labeled components including LCD screen, ON/OFF button, Unit Switch, Record button, Hold Data button, DIF Mode button, Tube Connectors, Protection Cover, and Battery Door.
2. Package Contents
Before using the device, please verify that all items listed below are present and in good condition.
- 1 x INFURIDER YF-189A Digital Differential Pressure Gauge with Strap
- 2 x AAA Batteries
- 4 x Soft Hoses (1/8 inch / 3.18 mm quick connectors)
- 1 x Protective Bag
- 1 x Small Screwdriver
- 1 x User Manual
- 1 x Metal Terminal
Figure 2: All items included in the product package.
3. Setup
3.1 Battery Installation
- Locate the battery compartment on the back of the device.
- Use the provided small screwdriver to open the battery compartment cover.
- Insert two AAA batteries, ensuring correct polarity (+/-).
- Replace the battery compartment cover and secure it with the screw.
3.2 Connecting Hoses
- Identify the positive (+) and negative (-) pressure ports at the top of the device.
- Connect the soft hoses (1/8 inch / 3.18 mm quick connectors) to the desired ports based on your measurement requirements.
- Ensure the connections are secure to prevent leaks.
4. Operating Instructions
4.1 Power On/Off
- Press the ON/OFF button to turn the device on.
- To turn off, press and hold the ON/OFF button until the display turns off.
- The device will automatically shut down after approximately 25 minutes of inactivity.
4.2 Unit Selection
- Press the UNIT button to cycle through the 11 available pressure units (mmHg, inHg, ftH₂O, cmH₂O, inH₂O, KPa, mbar, bar, psi, Kgcm², ozin²).
- Select the appropriate unit for your measurement.
4.3 Backlight Function
- Press the Backlight button (light bulb icon) to turn the LCD backlight on or off. This improves visibility in low-light conditions.
4.4 Data Hold Function
- During measurement, press the HOLD button to freeze the current reading on the display.
- Press HOLD again to release the data hold and resume live measurement.
4.5 Differential (DIF) Mode
- Press the DIF button to activate differential pressure measurement. This mode displays the difference between the two input pressures.
- Press DIF again to exit differential mode.
4.6 Record (REC) Mode
- Press the REC button to enter recording mode. The device will start recording maximum (MAX), minimum (MIN), and average (AVG) pressure values.
- While in REC mode, you can cycle through MAX, MIN, and AVG readings by pressing the REC button repeatedly.
- To exit REC mode, press and hold the REC button.
Video 1: Demonstration of HOLD and LCD backlight functions on a similar digital manometer. This video illustrates basic button operations for data hold and screen illumination.
Video 2: Overview of a digital micro pressure gauge, highlighting its features including 11 selectable units and handheld design. This video provides a general understanding of digital manometer usage.
5. Maintenance
Proper maintenance ensures the longevity and accuracy of your INFURIDER YF-189A differential pressure gauge.
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: When not in use, store the device in the provided protective bag to shield the ports from dust and rust. Store in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Replacement: Replace batteries when the low battery indicator appears on the display to ensure continuous operation and prevent data loss.
- Protection Cover: Always use the ABS plastic protection cover over the tube connectors when the device is not in use to prevent damage and contamination.
Figure 3: The device features an ABS plastic cover to protect connectors and a lanyard for portability and durability.
6. Troubleshooting
If you encounter issues with your INFURIDER YF-189A, refer to the following common problems and solutions:
- Device does not power on:
- Check if the batteries are installed correctly with the right polarity.
- Replace the batteries with new AAA batteries.
- Display shows "ERR1" or "ERR2":
- These error codes indicate that the measured pressure is outside the device's specified range (±6 Psi). Reduce the applied pressure or ensure the pressure is within the operational limits.
- Inaccurate readings:
- Ensure hoses are securely connected and free from kinks or blockages.
- Verify that the selected unit is appropriate for the measurement.
- Ensure the device is operating within the specified temperature range (0~40℃).
- Backlight not working:
- Check battery level. Low batteries may affect backlight functionality.
7. Specifications
| Parameter | Value |
|---|---|
| Accuracy | ±0.3%FS |
| Linearity/Hysteresis | ±0.1% FS of full scale |
| Maximum Pressure Limit | 6 Psi |
| Repeatability | ±0.25%FS |
| Auto Shut-down | Approx. 25 minutes |
| Pressure Connection | 1/8 inch (3.18 mm) Quick Connector x 1 |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Storage Temperature Range | -10°C to 60°C (14°F to 140°F) |
| Over Range Prompt | ERR1 or ERR2 |
| Weight | 134g |
| Dimensions | 160 x 62 x 31 mm (6.3 x 2.44 x 1.22 inches) |
| Power Supply | 2 x AAA Batteries |
Figure 4: Detailed table of measurement units, their respective ranges, and resolutions.
8. Warranty & Support
INFURIDER provides a 365-day warranty for this product. If you have any questions, concerns, or require assistance with your INFURIDER YF-189A Digital Differential Pressure Gauge, please do not hesitate to contact INFURIDER customer support. Refer to the product packaging or the official INFURIDER website for contact information.
