1. Introduction and Overview
The HoldPeak BT-189B is a versatile digital differential pressure gauge designed for precise measurement of ventilation and air conditioning systems, on-site calibration, and troubleshooting of various gas pressure systems. It features a dual-port design, LCD backlight display, data recording capabilities, and supports 11 different air pressure units.
2. Setup
2.1 Unpacking and Inspection
Carefully unpack the BT-189B and check for any damage. Ensure all components are present:
- BT-189B Digital Manometer
- Flexible Rubber Tubes
- Hose Adapter (3.1/8" (3.18mm) Thread size)
- Carrying Bag
- User Manual (this document)
2.2 Battery Installation
- Locate the battery compartment on the back of the device.
- Open the battery cover.
- Insert two AAA batteries, ensuring correct polarity (+/-).
- Close the battery cover securely.
2.3 Connecting Tubes
Connect the flexible rubber tubes to the dual ports at the top of the manometer. The ports are typically marked for positive (+) and negative (-) pressure. Ensure a secure connection to prevent leaks.
3. Operating Instructions
3.1 Power On/Off
- Press the Power button (red button) to turn the device on.
- Press and hold the Power button for a few seconds to turn the device off.
3.2 Backlight Control
- Press the Backlight button (yellow button) once to turn the LCD backlight on.
- Press it again to turn the backlight off.
3.3 Unit Switching
The BT-189B supports 11 different air pressure units. Press the UNIT button to cycle through the available units:
- inH2O
- Psi
- Mbar
- kPa
- inHg
- mmHg
- Ozin²
- ftH2O
- cmH2O
- Kgcm²
- Bar
3.4 Data Hold Function
- Press the HOLD button to freeze the current reading on the display. The 'HOLD' indicator will appear.
- Press the HOLD button again to release the data hold and resume live measurements.
3.5 Recording Max/Min/AVG Values
- Press the REC button to enter recording mode. The device will start recording maximum, minimum, and average pressure values.
- While in recording mode, short press the REC button repeatedly to cycle through the recorded Maximum, Minimum, and Average values.
- Long press the REC button for 5 seconds to exit recording mode.
3.6 Differential Pressure Measurement (DIF)
The BT-189B supports three measurement modes: Positive Pressure, Negative Pressure, and Differential Pressure.
- Press the DIF button to activate the differential pressure function.
- The display will show the difference between the current pressure value and the pressure value recorded just before pressing the DIF key.
4. Maintenance
4.1 Cleaning
Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents. Keep the pressure ports free from dust and debris.
4.2 Battery Replacement
When the low battery indicator appears on the display, replace the two AAA batteries promptly to ensure accurate readings and continuous operation. Refer to section 2.2 for battery installation steps.
4.3 Storage
When not in use for extended periods, remove the batteries to prevent leakage. Store the device in its carrying bag in a cool, dry place, away from direct sunlight and extreme temperatures.
5. Troubleshooting
5.1 Over-range Indication
- If the display shows ERR1 or ERR2, it indicates that the measured pressure is outside the device's specified range.
- Reduce the applied pressure or ensure the pressure source is within the acceptable limits.
5.2 No Display/Device Not Turning On
- Check if the batteries are correctly installed and have sufficient charge. Replace them if necessary.
- Ensure the power button is pressed firmly.
5.3 Inaccurate Readings
- Ensure the pressure connections are secure and free of leaks.
- Verify that the correct pressure unit is selected.
- Perform a zero-out calibration if available (refer to the main functions image).
- Check for any physical damage to the device or tubes.
6. Specifications
| Feature | Specification |
|---|---|
| Measuring Range | ±206.8 kPa / ±30.00 Psi |
| Accuracy | ±0.3% FS |
| Linearity/Hysteresis | ±0.1% FS of full scale |
| Repeatability | ±0.25% FS |
| Response Time | 0.5 seconds |
| Limit Maximum Pressure | 6 Psi |
| Pressure Connection | One 1/8" (3.18 mm) quick connector |
| Operating Temperature | 0~40℃ (32~104°F) |
| Storage Temperature Range | -10~60℃ (14~140°F) |
| Over-range Prompt | ERR1 or ERR2 |
| Automatic Shutdown | About 25 minutes |
| Working Power Supply | Two AAA batteries (not included) |
| Item Weight | 134g / 4.73oz |
| Item Size | 160 x 62 x 31 mm (6.3 x 2.44 x 1.22 in) |
7. User Tips
- Zero Calibration: Always perform a zero-out calibration before taking critical measurements to ensure the highest accuracy.
- Tube Integrity: Regularly inspect the flexible rubber tubes for cracks or damage, as leaks can significantly affect readings.
- Environmental Conditions: Be aware of the operating temperature range. Extreme temperatures can impact the device's performance and accuracy.
- Battery Life: Keep spare AAA batteries on hand, especially for prolonged use, to avoid interruptions during important tasks.
- Proper Storage: Utilize the provided carrying bag for storage and transport to protect the device from physical damage and environmental factors.
8. Warranty and Support
For warranty information, technical support, or service inquiries, please contact the manufacturer or your point of purchase. Keep your purchase receipt as proof of purchase.
