Temperature & Humidity
Instruments

IAQ Detectors, the indoor air quality brand of Ace Instruments, manufactures CE certified temperature and relative humidity transmitters for commercial buildings, server rooms, and pharmaceutical storage. The range spans built-in probe, external probe, dew point, and duct-mounted configurations, with output via Modbus RS-485, 4-20mA, or 0-10V.

ASHRAE 55-2023 defines a year-round comfort target of 20-26°C and
40-60% relative humidity, while server room environments follow the wider ASHRAE Class A2 allowable range of 18-27°C and 20-80% RH.

RTD / capacitive RH sensingModbus RS-4854-20mA / 0-10VCE certified6 instruments
Browse all T/RH instruments →Talk to an application engineer

Comfort range reference: ASHRAE 55-2023

16°C20°C26°C30°C
Heating season target20-23°C
Year-round comfort target20-26°C
Cooling season target23-26°C
Server room (ASHRAE A2)18-27°C
Wall mountT/RH Transmitter with built-in probe, wall-mounted temperature and humidity transmitter

T/RH Transmitter (Built-in Probe)

TRH
RS-485DisplayBuilt-in probe
Offices · Comfort monitoringView instrument →
Wall mountT/RH Transmitter with external probe for remote temperature and humidity sensing

T/RH Transmitter (External Probe)

TRH
RS-485Remote probe4-20mA
Chambers · EnclosuresView instrument →
Wall mountDew Point Transmitter measuring temperature, humidity and dew point

Dew Point Transmitter

TRH
RS-485Dew point calcDisplay
Server rooms · Pharma storageView instrument →
Wall mountServer Room Temperature Monitor with alarm relay for data centres

Server Room Temperature Monitor

T
RS-485Alarm relayASHRAE A1
Data centres · Server roomsView instrument →
Wall mountImmersion Temperature Sensor for liquid and process pipework

Immersion Temperature Sensor

T
RTD probe4-20mALiquid immersion
Process pipework · TanksView instrument →
Duct typeDuct Temperature / Humidity Monitor for HVAC AHU ductwork

Duct Temperature / Humidity Monitor

TRH
RS-485HVACDuct mount
AHU · DuctworkView instrument →

Instrument comparison

Quick specification reference across the range

FeatureT/RH Transmitter (Built-in Probe)T/RH Transmitter (External Probe)Dew Point TransmitterServer Room Temperature MonitorImmersion Temperature SensorDuct Temperature / Humidity Monitor
Mount typeWallWall + remote probeWallWallImmersion / probeDuct
Temperature✓✓✓✓✓✓
Humidity (RH)✓✓✓N/AN/A✓
Dew point calculationN/AN/A✓N/AN/AN/A
Modbus RS-485✓✓✓✓N/A✓
Best forGeneral officesChambers, enclosuresCondensation-sensitive areasData centresLiquid / process temperatureAHU, ductwork

Common applications

Where continuous temperature and humidity monitoring is critical

🏢

Commercial buildings

Open-plan offices monitor temperature and RH against ASHRAE 55-2023 comfort targets for occupant wellbeing.

🖥️

Data centres & server rooms

Server room instruments track the ASHRAE Class A2 allowable range of 18-27°C and 20-80% RH to protect equipment uptime.

🏥

Hospitals & labs

Pharmaceutical GDP storage rooms hold 15-25°C and below 60% RH, continuously logged for compliance.

🏛️

Museums

Collection storage maintains a stable 16-22°C and 45-55% RH per PAS 198:2012, with rate-of-change limited to 10% RH per 24 hours.

🏫

Educational institutions

Classrooms monitor temperature and humidity alongside CO2 as part of comprehensive comfort and IAQ programs.

🏪

Retail spaces

Retail environments maintain comfort-band temperature and humidity to support dwell time and product storage conditions.

Expert guidance

Not sure which T/RH instrument fits your application?

Our application engineers will recommend the right instrument based on your space type, probe requirements, and BMS integration. Most enquiries answered within 24 hours.

Talk to an expert →

sales@iaqdetectors.com · +91 8121025651 · Hyderabad, India