OQIMAX Digital Refrigerator Thermometer with 2 Sensors User Manual (Model EU-WA-181)

Introduction

This manual provides detailed instructions for the setup, operation, and maintenance of your OQIMAX Digital Refrigerator Thermometer. This device is designed to monitor temperatures and humidity in up to three zones simultaneously: the main unit's immediate environment (indoor) and two remote wireless sensors for refrigerators, freezers, or other areas. It features a color LCD screen, adjustable alarms, and MIN/MAX value tracking to help you maintain optimal conditions.

Safety Information

Do not expose the main unit or sensors to excessive force, shock, dust, temperature, or humidity.
Do not immerse the main unit or sensors in water.
Do not attempt to disassemble or modify the device. There are no user-serviceable parts inside.
Dispose of used batteries responsibly according to local regulations. Do not mix old and new batteries or different types of batteries.
Keep the device and batteries out of reach of children.

Package Contents

Please check the package contents to ensure all items are present:

1 x Main Host Unit (Receiver)
2 x Wireless Remote Sensors (Transmitters)
1 x USB Data Cable (1.5m)
1 x Magnetic Pad (self-adhesive)
1 x User Manual (English and German)

Package contents of the OQIMAX Digital Refrigerator Thermometer, showing the main unit, two remote sensors, USB cable, magnetic pad, and user manual. — Image: The complete package contents, including the main display unit, two wireless sensors, USB cable, magnetic pad, and instruction manual.

Product Overview

The OQIMAX Digital Refrigerator Thermometer consists of a main display unit and two wireless remote sensors. The main unit displays indoor temperature and humidity, along with readings from the two remote sensors.

Main Unit (Receiver)

The main unit features a color LCD screen that provides a clear, intuitive display of all monitored zones. It also shows time, date, comfort icons, and MIN/MAX temperature/humidity values.

Close-up of the OQIMAX thermometer's main display unit, showing various readings and labels for indoor temperature and humidity, sensor 1 temperature and humidity, sensor 2 temperature and humidity, time, calendar, and alert indicators. — Image: Detailed view of the main unit's display, highlighting indoor temperature and humidity, Sensor 1 and Sensor 2 readings, time, calendar, and alert indicators.

Indoor Display: Shows current temperature and humidity of the main unit's location (light yellow zone).
Sensor 1 Display: Shows current temperature and humidity from the first remote sensor (green zone).
Sensor 2 Display: Shows current temperature and humidity from the second remote sensor (blue zone).
Time & Calendar: Displays current time and date, including Daylight Saving Time (DST) indicator.
MIN/MAX Values: Shows the minimum and maximum recorded temperatures and humidity for each zone.
Alert Indicators: Bell icons indicate active alarms.
Buttons: CH1, CH2, MODE, +/CLE, -/RF for navigation and settings.

Wireless Remote Sensors (Transmitters)

The two compact wireless sensors transmit temperature data to the main unit. They are designed for placement inside refrigerators, freezers, or other remote locations.

Two remote sensors placed inside a refrigerator and a freezer, demonstrating their use for temperature monitoring in different compartments. — Image: Two remote sensors are shown, one inside a refrigerator compartment with fresh produce and another inside a freezer compartment with frozen goods, illustrating their intended use.

Each sensor has a power indicator and a channel switch (CH1/CH2) inside the battery compartment.
They transmit data wirelessly up to 100 meters (328 feet) in open areas.

Setup

1. Powering the Main Unit

The main unit offers dual power options:

Battery Operation: Insert 3 x AAA 1.5V batteries (not included) into the battery compartment on the back of the main unit. The backlight will automatically turn off after 10 seconds to conserve power.
USB Power: Connect the included USB cable to the power port on the main unit and to a USB power adapter (not included). In USB mode, the backlight remains permanently active and has 3 adjustable brightness levels.

The main unit connected via USB cable to a wall adapter, illustrating the dual power supply option. A button labeled 'Backlight' is also shown. — Image: The main unit is shown powered via a USB cable connected to a wall adapter, demonstrating the USB power option. The backlight button is also indicated.

2. Installing Batteries in Remote Sensors

For each remote sensor:

Open the battery compartment on the back of the sensor.
Insert 2 x AA 1.5V batteries (not included), ensuring correct polarity.
Inside the battery compartment, set the channel switch to either CH1 or CH2. Ensure each sensor is assigned a unique channel.
Close the battery compartment securely.

3. Pairing the Sensors

The sensors are designed for automatic pairing:

Once the main unit is powered on, insert batteries into Transmitter 1 and Transmitter 2 in order.
The sensors will automatically search for signals and connect quickly to the main unit.
Temperature and humidity data will then be displayed in real-time on the main unit's screen.
In case of interference or connection loss, press the TX pairing button on the main unit to immediately re-establish the connection.

4. Placement and Mounting

The main unit offers versatile mounting options:

Stand: Use the integrated foldable stand on the back for tabletop placement.
Wall Mount: Utilize the hang hole on the back to mount the unit on a wall.
Magnetic Attachment: Attach the included self-adhesive magnetic pad to the back of the unit, then place it on any magnetic surface like a refrigerator door.

The back of the main unit showing the hang hole, magnet cover, battery compartment, sounding hole, power port, and stand. Below, three images show the unit being hung on a wall, standing on a table, and magnetically attached to a refrigerator. — Image: The back of the main unit with its features labeled, and examples of the unit being hung on a wall, placed on a stand, and magnetically attached to a refrigerator.

Place remote sensors in your refrigerator, freezer, or other desired locations. Ensure they are within the 100-meter (328 feet) transmission range of the main unit, especially in open areas. Obstacles like thick walls can reduce the effective range.

The main unit on a countertop with a remote sensor inside a refrigerator, illustrating the wireless transmission range of up to 328 feet or 100 meters. — Image: The main unit is positioned on a kitchen counter, while a remote sensor is placed inside a refrigerator, demonstrating the wireless connectivity and maximum transmission distance of 328 feet (100 meters).

Operating Instructions

Display Overview

The color-separated display provides instant orientation:

Light Yellow Zone: Indoor temperature and humidity.
Green Zone: Sensor 1 temperature and humidity.
Blue Zone: Sensor 2 temperature and humidity.

Setting Time and Date

Refer to the detailed instructions in the included paper manual for specific steps on setting the time, date, and Daylight Saving Time (DST).

Switching Temperature Units (°C/°F)

Press the MODE button to cycle through display modes or to switch between Celsius (°C) and Fahrenheit (°F) units.

Viewing MIN/MAX Values

Press the +/CLE button to view the minimum and maximum recorded temperatures and humidity for each zone. You can choose to display values for the last 24 hours or for the entire period since the last reset.

Setting Temperature Alarms

The device allows you to set individual high and low temperature alarms for the remote sensors (range: -40°C to 70°C / -40°F to 158°F).

Press the CH1 or CH2 button to select the sensor for which you want to set an alarm.
Press and hold the MODE button until the alarm setting mode is activated.
Use the +/CLE and -/RF buttons to adjust the high and low temperature limits.
Press MODE again to confirm each setting and move to the next.

When an alarm limit is exceeded, the device will trigger an audible and visual alarm for 2 minutes. You can dismiss the alarm immediately by pressing any button. To check the currently set alarm values, press the -/RF button.

The main unit display showing an alarm bell icon, indicating an active temperature alarm. Text explains the adjustable alarm range and duration. — Image: The main unit display with an alarm bell icon, illustrating the temperature alarm feature. The adjustable alarm range of -40°C to 70°C (-40°F to 158°F) is noted, and the alarm duration of 2 minutes.

Backlight Control

If the main unit is powered by batteries, the backlight will automatically turn off after 10 seconds. If powered via USB, the backlight remains continuously active and can be adjusted to 3 brightness levels by pressing the backlight button (usually indicated by a light bulb icon).

Maintenance

Cleaning: Wipe the main unit and sensors with a soft, damp cloth. Do not use abrasive cleaners or solvents.
Battery Replacement: Replace batteries in the main unit (3 x AAA) and sensors (2 x AA each) when the low battery indicator appears on the display. Ensure correct polarity when inserting new batteries.
Storage: If storing the device for an extended period, remove all batteries to prevent leakage.

Troubleshooting

Problem	Possible Cause	Solution
No display on main unit	Batteries are dead or incorrectly inserted; USB cable not connected or faulty.	Check battery polarity and replace if necessary. Ensure USB cable is securely connected and power source is active.
Remote sensor readings not displayed (dashes shown)	Sensor out of range; sensor batteries dead; interference; sensor not paired.	Move sensor closer to the main unit. Replace sensor batteries. Press the TX button on the main unit to re-establish connection. Ensure sensor channel is correctly set (CH1/CH2).
Inaccurate temperature/humidity readings	Sensor placed in direct sunlight or near heat/cold source; ventilation issues.	Relocate sensors to a more representative area. Allow time for readings to stabilize. Compare with another known accurate thermometer if possible.
Alarm not sounding	Alarm not enabled or limits set incorrectly; volume too low.	Verify alarm settings and ensure they are active. Check the set temperature limits.

Specifications

Feature	Description
Model Number	EU-WA-181
Main Unit Dimensions	13.4 x 9.5 x 2.5 cm (5.3 x 3.75 x 1 inches)
Main Unit Power	3 x AAA 1.5V batteries (not included) or USB cable (included)
Main Unit Temp Range	-9.9°C ~ 50°C (14.2°F ~ 122°F)
Main Unit Humidity Range	20% ~ 95% RH
Sensor Dimensions	12 x 4 x 2.4 cm
Sensor Power	2 x AA 1.5V batteries (not included) per sensor
Sensor Temp Range	-40°C ~ 70°C (-40°F ~ 158°F)
Temperature Accuracy	±1°C (0°C to 40°C), ±2°C (other ranges)
Humidity Accuracy	±5% (40% to 80% RH), ±8% (other ranges)
Temperature Resolution	0.1°C / 0.1°F
Humidity Resolution	1%
Transmission Frequency	433 MHz
Wireless Range	Up to 100 meters (328 feet) in open areas
Data Refresh Rate	Every 30-32 seconds
Display Type	Color LCD
Special Features	Alarm, Backlight, Max/Min, DST, Calendar
Exterior Material	Plastic or Metal

The main unit of the OQIMAX thermometer displayed next to a refrigerator, showing its dimensions (13.4cm height, 9.5cm width) and key specifications like outdoor temperature range, accuracy, and refresh rate. — Image: The main unit's dimensions (13.4cm x 9.5cm) are illustrated next to a refrigerator, along with icons representing outdoor temperature range (-40°C to 70°C), temperature accuracy (±1°C), humidity accuracy (±5% RH), and data refresh rate (every 30 seconds).

Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the retailer where you purchased the product or visit the official OQIMAX website. Please retain your proof of purchase for warranty claims.

OQIMAX EU-WA-181

OQIMAX Digital Refrigerator Thermometer with 2 Sensors