UNI-T UT330+ Series - User Manual

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P/N:110401109799X
Overview
UT330+ series temperature humidity meters (hereafter referred to as “Meters”)
adopts high precision sensor and super-low power consumption microprocessor
in its design, featuring high accuracy, manual and auto storage, USB data transfer,
USB power supply, backlight alarm, real-time display, low power consumption, etc.
These Meters can be used in factories, laboratories, research institutes, food and
health, environmental protection and other fields.
UT331+/UT332+
Digital Temperature Humidity Meters
Unpacking Inspection
Operating Manual --------------------------------- 1 piece
Battery ----------------------------------------------- 4 pieces
USB Data Cable ----------------------------------- 1 piece
Safety Information
Warning
A warning identifies conditions and actions that pose hazards to the user. To avoid
electrical shock or personal injury, follow these guidelines:
Meter Description
Meter Structure (See Figure 1)
Description
Protective cover of sensor
(turn to open or close)
Display screen
Power on/off
Press to display Max/Min value among
current readings. Long press to exit the
function (also used as button).
Press to save data. Refer to “Store and
Recall Data” for details
To set Meters. It is used together with
buttons. See “Setting Meters” for details.
Short press to turn on/off the backlight,
long press to turn on/off alarm function.
Press to freeze the displayed readings, press again to exit the function.
(also used as button)
Press to view data, it is used together with buttons. See “Store and
Recall Data” for details.
Dew-point temperature and wet bulb temperature selection key
(also used as confirm button).
Display Screen
Description
HI: Upper limit. LO: Lower limit
Dew-point temperature
Wet-bulb temperature
Storage group number
Maximum value
Minimum value
Humidity display zone
Data hold
Humidity unit
Description
Auto power off
Low battery/USB power supply
Alarm
Humidity icon
Temperature icon
Celsius unit
Temperature display zone
Fahrenheit unit
Time display zone
No.No.
Setting Meters
SETUP Options
Short press SETUP button to enter into setting mode, first enter into unit setting
page, and then press recyclable to switch the setting state until the setting is storage
and exit. On any setting page, the setting mode will exit and be back to measuring
page if no any button is pressed for 15 seconds. The cycle sequence:
Measuring state→Temperature unit setup →Time interval setup→Temperature &
Humidity Upper Limit Alarm Setup→Temperature & Humidity Lower Limit Alarm
Setup→Sleep time setup→System time setup→Temperature & Humidity Offset setup
→ Measuring state.
Performing the Setups
1. Setting Temperature Unit
Short press SETUP to access temperature unit setup mode, press (HOLD)/
(MAX/MIN) to select ℃ or ℉ unit.
2. Setting Time Unit
Short press SETUP to switch to time interval mode, “int” shows on LCD. Press
to change the interval for automatic data storage. Long press to increase
/decrease the time quickly. The interval can be set up to 59:59 and down to 00:00
(auto data storage disabled at 00:00).
3. Upper-limit temperature & humidity setting
Short press SETUP for 3 times to access upper limit setup mode, “HI” shows on
LCD, short press ENTER/DP to switch upper-limit temperature & humidity,
upper-limit dew-point temperature, upper-limit wet-bulb temperature, press
change the value.to
4. Lower-limit temperature & humidity setting
Short press SETUP for 4 times to switch to lower limit setup mode, “LO” shows
on LCD, short press ENTER/DP to switch following setups: lower-limit temperature
& humidity, lower-limit dew-point temperature, lower-limit wet-bulb temperature,
press to change the value.
5. Sleep Mode Setting
Short press SETUP for 5 times to switch to sleep setting mode, “SLP” icon shows,
press to set up sleep time (5~60mins), long press to increase/decrease
quickly. When the set time is ＜5mins, “OFF” icon shows and sleep the time
disabled.function is
Inspect the case before using Meters. Do not use Meters if it appears damaged.
Look for cracks or missing plastic. Pay particular attention to the insulation
around the connectors.
Replace the batteries as soon as the battery indicator “ ” appears.
Do not use Meters if it operates abnormally. Protection may be impaired. When
in doubt, have Meters serviced.
Do not operate Meters around explosive gas, vapor, or dust.
When servicing Meters, use only specified replacement parts.
Do not use Meters with any part of the case or cover removed.
Do not clean the sensor with water. Turn to close the protective sensor cover
when not in use. To avoid damage to the device, please use with care.
Never charge the battery.
Use the approved alkaline battery (AAA 1.5V) only.
Pay attention to “+” and “-” marks when installing the batteries.
Close the sensor cover and remove the batteries if Meters is not used for a long
time.
6. System Time Setting
Short press SETUP for 6 times to switch to system time setting mode, short
press ENTER/DR to switch Year/Month/Day/Hour/Minute, press to the time
value, long press to increase/decrease the time quickly. Only when the minute
setting is completed and short press ENTER/DP again can the system time is
stored.
7. Setting Temperature & Humidity Offset
Short press SETUP for 7 times to switch to temperature & humidity offset setting
mode, “t-o” shows on LCD, short press ENTER/DP to switch temperature offset
setting (t-o), humidity offset setting (h-o), dew-point temperature offset setting
(d-o), wet bulb temperature offset setting (b-o), press to change offset value
that within -6~6.
Using Meters
Turn on/off Meters
1. Long press yellow button to turn on Meters.
2. With Meters already turned on, long pressing yellow button again will turn off
Meters.
3. After the sleep time is set, Meters will auto turn of f if no button is active within
the set time.
4. To ensure an accurate result, the user is recommended to wait for a while before
taking the readings if the measured humidity & temperature change dramatically.
Data Hold
1. Press HOLD button to freeze the reading, “HOLD” appears on LCD.
2. Press HOLD again to quit the function.
No.
Figure 1
Figure 2

Summary

Overview and Inspection

Unpacking Inspection

Confirms the included components: operating manual, batteries, and USB data cable.

Safety Precautions

General Warnings

Highlights critical safety instructions to prevent electrical shock or injury.

Battery Usage Guidelines

Specifies approved battery types, correct installation, and storage precautions.

Meter Description and Setup

Meter Structure and Display

Details the physical components of the Meter and its display screen layout.

Setting Meters

Guides users through configuring unit settings, limits, sleep mode, system time, and offsets.

Meter Operation

Power and Backlight Control

Instructions for turning the Meter on/off, controlling the backlight, and activating alarms.

Reading and Data Management

Covers viewing Max/Min readings, dew-point/wet-bulb temps, data access, recall, and transfer.

Data Storage and Access

Explains manual and auto data storage, recalling recorded data, and clearing stored data.

Data Transfer and USB Power

Details how to transfer data to a PC and use USB for power supply.

Technical Specifications and Maintenance

Technical Index

Provides a detailed list of measurement ranges, accuracy, resolution, and features.

USB Communication and Software

Instructions for connecting the Meter to a PC and using the master computer software.

Maintenance Procedures

Guides on replacing batteries and cleaning the Meter's casing.

Overview

1. UT331+/UT332+ Digital Temperature Humidity Meters
   1. Function Description
   2. Usage Features
   3. Maintenance Features

UT331+/UT332+ Digital Temperature Humidity Meters

The UT330+ series digital temperature humidity meters are advanced instruments designed for precise environmental monitoring. These meters incorporate a high-precision sensor and a super-low power consumption microprocessor, ensuring accurate measurements and extended battery life. Key features include high accuracy, manual and automatic data storage, USB data transfer, USB power supply, backlight alarm, real-time display, and low power consumption. These meters are suitable for a wide range of applications in factories, laboratories, research institutes, food and health industries, and environmental protection.

Function Description

The meters offer comprehensive functionality for temperature and humidity measurement and data management. Users can select between Celsius and Fahrenheit units for temperature display. The device supports setting time intervals for automatic data storage, allowing for continuous monitoring. Upper and lower limits for temperature and humidity, including dew-point and wet-bulb temperatures, can be configured, triggering alarms when these thresholds are exceeded. A sleep mode is available to conserve battery life, with adjustable sleep times or the option to disable it. The system time can be set, including year, month, day, hour, and minute. To ensure accuracy, the meters allow for temperature and humidity offset adjustments, including dew-point and wet-bulb temperature offsets, within a range of -6 to 6.

The backlight feature can be toggled on and off. An alarm function, when activated, provides visual cues: a red backlight flashes for upper-limit alarms, and a blue backlight flashes for lower-limit alarms. If both upper and lower limits are exceeded, the red and blue backlights flash alternately. The corresponding icons (e.g., temperature icon, HI/LO icons) also flash to indicate the specific alarm condition.

The meters support viewing maximum and minimum readings recorded during a measurement session. Users can also view dew-point temperature and wet-bulb temperature, with "DEW POINT" or "WET BULB" displayed on the screen, respectively. An offset value can be used to adjust for measurement errors in temperature and humidity.

Data storage is a core function. In manual storage mode (time interval set to 00:00), users can manually save data by pressing the STORE button. The meters flash and display the storage area (e.g., LOG 001). The UT331+ can store 299 groups of data, while the UT332+ can store 999 groups. In automatic storage mode (time interval not 00:00), long pressing the STORE button initiates automatic data saving at the set interval, with data stored in a circular manner.

Recorded data can be recalled by short pressing the RECALL button. Users can scroll through stored readings using the ▼▲ buttons. The meters default to the last saved reading. Under RECALL mode, short pressing ENTER allows for quick review of data and facilitates data transfer to a PC via USB. Long pressing RECALL under RECALL MODE clears all recorded data, displaying "dELE" until the process is complete. This action is irreversible, so users are advised to exercise caution.

Data transfer to a PC is possible in two scenarios: when in RECALL status, short pressing ENTER not only reviews data but also automatically transfers it to the PC; and when the PC is running the supplied software and connected to the meters, measured data is automatically transferred.

Usage Features

Turning On/Off: To power on the meters, long press the yellow button. To power off, long press the yellow button again. If the sleep time is set, the meters will automatically power off if no button is pressed within the specified time. For accurate results, it's recommended to wait a moment before taking readings if there's a significant change in humidity or temperature.

Data Hold: Press the HOLD button to freeze the displayed reading; "HOLD" will appear on the LCD. Press HOLD again to exit this function.

Setting Meters: Short press the SETUP button to enter the setting mode. The sequence of settings is: Temperature unit setup → Time interval setup → Temperature & Humidity Upper Limit Alarm Setup → Temperature & Humidity Lower Limit Alarm Setup → Sleep time setup → System time setup → Temperature & Humidity Offset setup. The setting mode will automatically exit if no button is pressed for 15 seconds.

Temperature Unit Setup: In setting mode, use the (HOLD)/▲ (MAX/MIN) buttons to select °C or °F.

Time Interval Setup: In time interval mode ("int" displayed), use ▼▲ to change the interval for automatic data storage. Long pressing ▼▲ allows for quick adjustment. The interval can be set from 00:00 (disabled) to 59:59.

Upper/Lower Limit Setting: In upper/lower limit setup mode ("HI" or "LO" displayed), short press ENTER/DP to switch between temperature, humidity, dew-point, and wet-bulb settings. Use ▼▲ to adjust the values.

Sleep Mode Setting: In sleep setting mode ("SLP" icon displayed), use ▼▲ to set the sleep time (5-60 minutes). Setting the time below 5 minutes disables the sleep function ("OFF" icon displayed).

System Time Setting: In system time setting mode, short press ENTER/DR to switch between Year/Month/Day/Hour/Minute. Use ▼▲ to adjust the time values. The system time is stored only after the minute setting is completed and ENTER/DP is pressed again.

Offset Setting: In offset setting mode ("t-o" displayed), short press ENTER/DP to switch between temperature, humidity, dew-point, and wet-bulb temperature offsets. Use ▼▲ to change the offset values within -6 to 6.

USB Power Supply: Connect the USB cable to a PC USB interface or a 5V DC adapter. The meters will automatically switch to USB power. Disconnecting the USB cable switches back to battery power. Note that using a DC voltage over 5V for USB power may damage the meters.

USB Communication: To use USB communication, download and install the PC software. Connect the USB cable to the computer, then browse and analyze data through the software. Refer to the "Software Manual" for detailed instructions.

Maintenance Features

Replacing the Battery: When the battery indicator "" appears, replace the batteries promptly. Unscrew the battery cover, remove it, replace with new 4xAAA batteries, and then reattach the cover and tighten the screw.

Cleaning the Casing: To clean the surface of the meters, use a soft cloth or sponge dampened with a small amount of water, soap, or mild detergent. Do not wash the meters directly with water, as this may damage the internal circuits.

UNI-T UT330+ Series Specifications