Data Centre Environmental Monitoring Solutions in Malaysia

Data Centre Environmental Monitoring Solutions in Malaysia

Modern data centres require accurate, stable and responsive measurement to maintain equipment reliability, cooling efficiency and continuous operation.

Environmental monitoring should extend beyond a single room-temperature sensor. Temperature, relative humidity, differential pressure, chilled-water temperature, outdoor conditions and cooling-system performance can all influence the operating environment around critical IT equipment.

The correct measurement strategy depends on the data-centre design, cooling architecture, monitoring system and level of redundancy required.

Seacom supports data-centre environmental measurement using instruments for white-space monitoring, HVAC and duct measurement, chilled-water and liquid-cooling infrastructure, differential pressure, outdoor weather and independent continuous monitoring.

Why Accurate Measurement Matters in a Data Centre

Temperature and humidity conditions directly affect server reliability, cooling performance and energy consumption.

Inaccurate or poorly positioned sensors can lead to unnecessary overcooling, hidden hot spots and misleading information about actual rack conditions.

A good monitoring strategy should therefore consider:

• Where the sensors are installed
• What each measurement represents
• Required measurement accuracy
• Sensor response time
• Long-term stability
• Communication with BMS, DCIM or monitoring systems
• Maintenance and calibration requirements

1. White-Space Temperature and Humidity Monitoring

Temperature and humidity should be measured at representative points around the data hall rather than relying on one sensor for the entire room.

Useful monitoring locations can include:

• Server-rack air inlets
• Rack outlets
• Cold aisles
• Hot aisles
• Representative room locations
• High-density rack areas

Multiple measuring points help reveal temperature stratification, airflow imbalance and localised hot spots that may not be visible from a single wall-mounted transmitter.

Vaisala HMW80 for General HVAC Monitoring

The Vaisala HMW80 provides practical humidity and temperature measurement for routine HVAC and building-automation applications.

It is suitable where straightforward wall-mounted room measurement is required and the project does not need the higher accuracy of the premium transmitter families.

Vaisala HMW90 for High-Accuracy Room Measurement

For more demanding indoor measurement, the Vaisala HMW90 provides high-accuracy humidity and temperature measurement for controlled environments and critical HVAC applications.

It can be considered for data halls and technical spaces where measurement accuracy, long-term stability and calibration documentation are important.

Vaisala HMW110 for High-Accuracy HVAC Applications

The Vaisala HMW110 is another option for high-accuracy humidity and temperature measurement.

The broader HMW110, HMD110 and HMS110 family provides wall, duct and outdoor measurement configurations, allowing the same measurement platform to be used across several parts of the HVAC system.

2. HVAC and Duct Monitoring

Supply-air and return-air conditions provide valuable information about cooling-unit and air-handling performance.

Typical measurement locations include:

• Supply-air ducts
• Return-air ducts
• Computer-room air-handling units
• Computer-room air-conditioning units
• Cooling-unit discharge
• Air-handler intake

Accurate duct measurements can support responsive cooling control and help operators understand whether the HVAC system is delivering the expected conditions.

Vaisala HMD60 for Duct Humidity and Temperature

The Vaisala HMD60 is designed specifically for duct-mounted humidity and temperature measurement.

It is suitable for supply-air and return-air monitoring where the measurement point is inside the ventilation duct rather than on the room wall.

Vaisala Origo10 for New HVAC and Data Centre Projects

For new projects requiring a flexible HVAC transmitter platform, the Vaisala Origo10 Series should be considered.

Origo10 supports interchangeable probes for humidity, temperature, CO₂ and dew-point measurement, with analog and digital output options including Modbus RTU and BACnet MS/TP depending on the selected configuration.

Wall-mounted and duct-mounted arrangements are available, making the platform suitable for data centres, HVAC systems, cleanrooms and other controlled environments.

For existing installations using Vaisala HMT120 or HMT130 transmitters, those models may remain relevant for replacement and maintenance requirements. For new installations, Origo10 is the current platform to evaluate first.

3. Chilled-Water and Liquid-Cooling Temperature

Accurate water-temperature measurement is increasingly important as data centres use higher-density cooling and liquid-cooling systems.

Measurements at the chilled-water supply and return can be used to evaluate temperature differential and cooling-system performance.

Typical locations include:

• Chilled-water supply
• Chilled-water return
• Cooling distribution units
• Heat exchangers
• Liquid-cooled rack infrastructure
• Secondary cooling circuits

Vaisala TMI110 for Immersion Temperature Measurement

The Vaisala TMI110 Immersion Temperature Transmitter provides accurate liquid-temperature measurement for chilled-water and data-centre cooling applications.

Monitoring both supply and return temperature provides a clearer picture of cooling-system performance than measuring only one side of the circuit.

For a broader discussion of flow and water measurement in liquid-cooled data centres, see our guide to choosing flow meters for data-centre cooling systems .

4. Differential-Pressure Monitoring

Differential pressure can help operators understand airflow relationships between different parts of the data centre.

Possible monitoring points include:

• Data hall to corridor
• Raised-floor plenum
• Equipment rooms
• Technical spaces
• Filtered-air sections
• Adjacent controlled rooms

Pressure measurements can help confirm airflow direction and reveal changes caused by fan operation, blocked filters, open doors or changes in cooling configuration.

Vaisala PDT101 and PDT102

The Vaisala PDT101 and PDT102 Differential Pressure Transmitters can be used for low differential-pressure measurement in HVAC and controlled-environment applications.

The correct pressure range should be selected according to the actual application. Oversizing the measurement range unnecessarily can reduce useful resolution at low operating pressures.

5. Compact Probe Installations

Some data-centre measurement points do not have enough space for a conventional wall or duct transmitter.

Rack-level installations, equipment enclosures and fast-changing environments may benefit from compact probes with small thermal mass and fast response.

Vaisala XMP10

The Vaisala XMP10 Series provides compact humidity and temperature measurement for locations where installation space is limited.

The compact format is useful for rack-level monitoring and other applications where a traditional wall transmitter would be difficult to install.

Vaisala HMP9

The Vaisala HMP9 Compact Humidity and Temperature Probe is designed for rapidly changing environments and space-restricted installations.

Its small probe size makes it useful where fast response and minimal disturbance to the measurement environment are important.

6. Carbon Dioxide and Indoor Air Quality

CO₂ measurement is generally less critical inside unoccupied server white space, but it can be useful in occupied technical areas, network-operation centres, control rooms and other spaces associated with data-centre operation.

Where humidity, temperature and CO₂ need to be combined in one indoor transmitter, the Vaisala XMW85 provides Modbus-based measurement for building-automation applications.

7. Outdoor Weather and Economiser Monitoring

Data centres using outside-air or air-side economiser strategies need dependable outdoor reference measurements.

Outdoor temperature and humidity help determine whether outside air is suitable for cooling. More complete weather information can also support site monitoring and operational planning.

Vaisala WXT530 Series

The Vaisala WXT530 Series Multi-Parameter Weather Transmitter can measure several outdoor weather parameters from one compact instrument, depending on the selected model.

Possible measurements include:

• Air temperature
• Relative humidity
• Barometric pressure
• Wind speed
• Wind direction
• Liquid precipitation

Typical installation points include rooftop weather stations, outdoor-air intakes and economiser reference locations.

8. Independent Continuous Monitoring

A BMS or DCIM system is normally responsible for control and infrastructure management. Some facilities also require a separate monitoring platform for independent environmental records, alarms and reports.

The Vaisala viewLinc Continuous Monitoring System provides centralised measurement records, alarms, historical trends and reporting across multiple monitoring locations.

Typical data-centre monitoring applications include:

• Data halls
• Server rooms
• Cooling infrastructure
• Electrical rooms
• UPS and battery areas
• Remote technical facilities
• Temperature and humidity monitoring
• Differential-pressure monitoring

Vaisala VDL200 for PoE Monitoring

The Vaisala VDL200 PoE Data Logger provides a wired Ethernet and Power-over-Ethernet option for viewLinc monitoring.

It can be useful in data centres where network cabling and PoE infrastructure are already available and an independent environmental monitoring system is required.

9. BMS and DCIM Integration

Most data-centre measurement instruments ultimately need to communicate with a BMS, DCIM platform, PLC or independent monitoring system.

Before selecting a transmitter, confirm:

• Required analog or digital output
• 4–20 mA or voltage-input requirements
• Modbus RTU or other protocol requirements
• Cable distance
• Available power supply
• Network architecture
• Local display requirements
• Calibration and maintenance strategy

Vaisala Indigo Transmitters for Smart-Probe Applications

Vaisala Indigo transmitters provide interfaces for compatible smart probes and can be used where local display, analog outputs, relays or digital communication are required.

Indigo200

The Vaisala Indigo200 Series provides a compact transmitter platform for compatible smart probes.

Indigo300

The Vaisala Indigo300 adds enhanced local visualisation and industrial integration options.

Indigo500

For demanding applications requiring an advanced transmitter platform, the Vaisala Indigo510 and Indigo520 support compatible smart probes and flexible system integration.

The probe and transmitter should be selected together according to the measurement parameter, required outputs, installation arrangement and communication method.

Where Should Data Centre Sensors Be Installed?

Sensor location is just as important as sensor accuracy.

A transmitter mounted in a convenient position may not represent the conditions experienced by the servers or cooling system.

Avoid Common Sensor-Placement Mistakes

Poor sensor placement can produce a technically accurate reading that does not represent the condition you actually need to monitor.

Avoid locations directly affected by:

• Cold supply-air jets unless supply air is the intended measurement
• Hot equipment exhaust unless outlet air is the intended measurement
• Doors that are opened frequently
• Direct sunlight
• Local heat sources
• Humidifiers
• Condensation
• Unrepresentative dead-air spaces

The monitoring point should be chosen according to the operational question the measurement is intended to answer.

Recommended Instrument by Monitoring Requirement

Planning a Data Centre Monitoring Architecture

There is no single sensor arrangement suitable for every data centre.

A small server room may need only a few representative temperature and humidity measurements, while a large facility may require rack-level measurements, HVAC sensors, chilled-water temperature, differential pressure, weather monitoring and an independent monitoring platform.

Before selecting instruments, define:

• Data-hall and rack layout
• Cooling architecture
• Air-cooled or liquid-cooled infrastructure
• Parameters to be monitored
• Number of measurement points
• Required accuracy
• BMS or DCIM interface
• Alarm requirements
• Power and network availability
• Calibration requirements
• Future expansion plans

Need Help Selecting Sensors for Your Data Centre?

Contact Seacom to discuss the sensors and monitoring instruments for your data centre in Malaysia. We can help you review measurement locations, suitable models and the connections required for your BMS, DCIM or independent monitoring system.

Send us your equipment schedule, floor plan or cooling schematic, together with the measurement range, required outputs and quantity. If you are replacing an existing instrument, include its model number and a photo of the installation.

For a broader look at air and cooling measurements, read our data centre air and cooling measurement guide.

Send us an enquiry by email or discuss your requirements on WhatsApp.