Description
The Vaisala QML201B is a high-performance, modular data logger specifically engineered for professional hydrological and meteorological monitoring. As a core component of the Vaisala HydroMet system, the QML201B provides reliable, real-time data acquisition from a wide array of sensors, including those measuring water level, precipitation, wind speed, and atmospheric pressure. Its industrial-grade design ensures consistent operation in remote and challenging outdoor environments. By offering versatile communication options and robust data storage, it serves as a critical bridge between environmental sensors and centralized management platforms. Explore our industrial hardware catalog to find robust automation and sensing components for your environmental monitoring infrastructure.

Product Specifications
- Model Name: QML201B Data Logger
- Manufacturer: Vaisala
- System Series: Vaisala HydroMet
- Input Capability: Multi-channel analog and digital sensor support
- Communication: RS-232, RS-485, and optional modem integration
- Data Processing: Real-time logging with time-stamping
- Power Supply: 9–30V DC (Optimized for solar/battery systems)
- Operating Temperature: -40°C to +60°C
- Ingress Protection: IP65-rated housing
- Country of Origin: Finland
Recommended Models in the VAISALA HydroMet Series
⚙️ QML201A (Baseline meteorological data acquisition unit)
⚙️ QML700 (Advanced modular weather station controller)
⚙️ AWS310 (Comprehensive automated weather station system)
⚙️ WXT530 (All-in-one meteorological sensor series)
⚙️ QMT110 (Temperature and humidity sensor module)
⚙️ PTB330 (Digital barometer for high-accuracy pressure measurement)
⚙️ WAA151 (Anemometer for professional wind sensing)
⚙️ WAV151 (Wind vane for precise direction tracking)
⚙️ DRD11A (Optical precipitation sensor)
⚙️ QMD200 (Data transfer unit for remote stations)
At Newplcdcs, we specialize in providing high-quality spare parts for Distributed Control Systems (DCS) and Programmable Logic Controllers (PLC). Our comprehensive product portfolio includes parts from approximately 20 leading brands, such as ABB, Bently Nevada, Honeywell, GE, Yokogawa, Allen Bradley, Foxboro, Ovation, Hima, Emerson, Triconex, Woodward, ICS Triplex, Bachmann, and Schneider. This focused expertise allows us to offer in-depth solutions in the automation sector, setting us apart from many competitors and ensuring we deliver the most advanced and reliable products to our clients.
Contact Information
Frequently Asked Questions
Is our price competitive?
Newsplcdcs collaborates with over 50 countries worldwide. as a leading supplier in china, we can provide significant discounts to customers based on market demand.
What is the warranty period?
We offer a standard one-year warranty for all new and original items.
What payment methods do we accept?
We accept 100% t/t (telegraphic transfer) before shipping. for items with a lead time, a 30% deposit is required in advance, with the remaining 70% balance due before shipping. if you have an agent in china, please contact us for rmb transfer.
What shipping methods do we use?
We primarily utilize carriers such as fedex, dhl, ups, bre, etc. if you have an account with any of these carriers, you can arrange the shipping yourself. additionally, we offer free shipping to china freight forwarders.
What is our delivery time?
Typically, delivery takes around 1-3 days after receiving the advance payment. for items with a quoted lead time, delivery will occur as per the specified lead time.
How do we package the goods?
Our packaging process involves multiple layers of protection. initially, the product is placed in its original box, sealed with a label. then, we add a layer of bubble wrap to safeguard against collisions during transportation. finally, all products are securely packed in sturdy boxes for further protection.
How can customers contact us and request a quote?
Customers can inquire via email, whatsapp, wechat, skype, or any preferred communication platform. simply reach out to us, and we’ll promptly provide a quote tailored to your needs.