1. Introduction
The CERTEON HTC Series Digital Thermo-Hygrometer is designed for accurate indoor and remote temperature and humidity monitoring. Featuring a large LCD display, it provides real-time measurements of ambient temperature and relative humidity. Specific models include an external probe for extended measurements in enclosed or liquid environments. This device is suitable for a wide range of applications including household use, agricultural settings, laboratories, and light industrial environments.
2. Product Overview
Figure 1: CERTEON HTC-1 and HTC-2 Digital Thermo-Hygrometers showcasing key features.
2.1 Package Contents
- Thermo-Hygrometer Unit (1)
- External Probe (for HTC-1 Upgrade and HTC-2 models) (1)
- User Manual (1)
2.2 Device Components
Figure 2: HTC-1 display showing temperature, time, humidity, and control panel buttons with their functions.
- LCD Display: Shows temperature, humidity, time, and other indicators.
- Control Panel Buttons:
- MODE: Switch/set clock and alarm, 12 or 24-hour format.
- ADJ: Adjust the value of the selected setting.
- MEMORY: Display high/low temperature and humidity memory values; clear memory.
- External Probe (on applicable models): For remote temperature/humidity sensing.
- Battery Compartment: Located on the rear of the unit.
- Desktop Stand / Wall Mount Hole: For flexible placement options.
3. Specifications
| Feature | Description |
|---|---|
| Display Type | LCD Digital Display |
| Power Supply | 1 x 1.5 V AAA Battery |
| Material | ABS Housing |
| Installation Method | Desktop Stand or Wall-mounted |
| Temperature Range | -50°C to +70°C (-58°F to +158°F) |
| Humidity Range | 10% RH to 99% RH |
| Probe Cable Length | 1 meter (for probe versions) |
3.1 Model Distinctions
| Model | Sensor Type | Probe Function | Waterproof | Dimensions (mm) |
|---|---|---|---|---|
| HTC-1 | Built-in temperature & humidity sensor | N/A (no external probe) | N/A | 101 × 92 × 20 |
| HTC-1 Upgrade | External non-waterproof probe | Measures temperature & humidity | No | 106 × 98 × 23 |
| HTC-2 | Built-in temp & humidity sensor + External waterproof probe | Probe measures temperature only | Yes (probe) | 106 × 98 × 23 |
4. Setup
4.1 Battery Installation
- Locate the battery compartment on the rear of the unit.
- Open the battery compartment cover.
- Insert one 1.5 V AAA battery, ensuring correct polarity (+/-).
- Securely close the battery compartment cover.
Figure 3: Rear view showing battery compartment and hanging hole for wall mounting.
4.2 Placement
- Desktop Placement: Use the integrated foldable stand to place the unit on a stable, flat surface. The stand provides a 45-degree viewing angle for optimal readability.
- Wall Mounting: Utilize the hanging hole on the rear of the unit to mount it on a wall using a suitable screw (not included).
- Probe Positioning (for HTC-1 Upgrade and HTC-2): If your model includes an external probe, position the probe in the target measurement area (e.g., refrigerator, freezer, greenhouse, water for HTC-2). Ensure the probe cable is not pinched or damaged.
5. Operating Instructions
5.1 Initial Operation
Once the battery is installed, the device will automatically power on and begin measuring temperature and humidity. The current readings will be displayed on the LCD screen.
5.2 Button Functions
- MODE Button: Used to switch between display modes (e.g., time, alarm, calendar) and to enter setting modes for clock and alarm. Press and hold to enter setting mode.
- ADJ Button: Used to adjust values when in a setting mode (e.g., hour, minute, date).
- MEMORY Button: Press to display the maximum and minimum recorded temperature and humidity values. Press again to cycle through MAX, MIN, and current readings. Press and hold to clear the recorded MAX/MIN values.
5.3 Setting Time, Alarm, and Calendar
Use the MODE and ADJ buttons to set the time (12/24-hour format), alarm, and calendar display according to your preference. Refer to the button functions above for specific actions.
5.4 Reading Data
- Temperature: The main display area shows the temperature in degrees Celsius (°C) or Fahrenheit (°F). Some models may have a °C/°F switch (often located in the battery compartment or as a dedicated button).
- Humidity: Relative humidity is shown as a percentage (RH%).
- HTC-2 Specific Display: For the HTC-2 model, the display may alternate or simultaneously show indoor measurements (from the built-in sensor) and probe temperature (from the external waterproof probe), depending on the display mode selected.
5.5 Max/Min Memory Function
The device automatically records the highest (MAX) and lowest (MIN) temperature and humidity values since the last reset. Press the MEMORY button to view these recorded values. To clear the memory and start a new recording cycle, press and hold the MEMORY button until the display resets.
6. Maintenance
6.1 Cleaning
Clean the housing of the device with a soft, dry cloth. Do not use solvents, abrasive cleaners, or harsh chemicals, as these can damage the plastic and electronic components.
6.2 Storage
Store the product in a dry and well-ventilated area when not in use. Avoid exposing the device to mechanical shock, heavy pressure, or extreme temperatures.
6.3 Battery Care
Regularly check the battery condition to prevent leakage, which can damage the device. If the device will not be used for an extended period, remove the AAA battery to prevent potential leakage and corrosion.
7. Troubleshooting
- No Display or Faint Display: Check if the battery is inserted correctly with the correct polarity. Replace the battery with a new one if the display is faint or absent.
- Inaccurate Readings: Ensure the device is placed in a stable environment away from direct heat sources, strong drafts, or direct sunlight. For probe models, ensure the probe is correctly positioned and not damaged.
- Buttons Not Responding: Remove and reinsert the battery to perform a soft reset. If the issue persists, replace the battery.
8. User Tips
- Probe Waterproofing: Remember that only the HTC-2 model features a waterproof probe, suitable for water temperature measurement. Probes for HTC-1 Upgrade are not waterproof and should not be exposed to moisture.
- Dual Measurement: If you need to measure both temperature and humidity with an external probe, choose the HTC-1 Upgrade version. For water temperature measurement, the HTC-2 is ideal, which also measures ambient humidity via its main unit.
- Easy Installation: All units are designed for flexible placement, featuring both a foldable stand for desktop use and a wall-mount hole.
9. Safety Precautions and Warnings
- Use only one 1.5 V AAA battery of appropriate quality. Do not mix old and new batteries.
- Remove the battery if the device will not be used for an extended period to prevent leakage.
- Do not expose the main unit to rain or high humidity environments.
- The standard HTC-1 and HTC-1 Upgrade probes are not waterproof. Only the HTC-2 probe is waterproof and intended for water temperature measurement. Ensure the main unit of the HTC-2 remains dry at all times.
- Do not place the device near strong electromagnetic fields, heat sources, or direct sunlight.
- Ensure the operating environment remains within the specified measurement range to ensure accuracy and prevent damage.
- WARNING! Improper battery installation may cause leakage or explosion. Insert battery according to polarity markings.
- Do not short-circuit, disassemble, or dispose of batteries in fire.
- Keep out of reach of children.
- Proper disposal: Follow local regulations for electronic waste disposal.
10. Warranty and Support
For warranty information, technical support, or any inquiries regarding your CERTEON HTC Series Digital Thermo-Hygrometer, please contact the seller or retailer from whom you purchased the product. Please have your purchase details ready when contacting support.
Figure 4: Contact information for support.