Clean Room Humidity-Temperature Monitor with External Sensor (AI-RHTm-E)

Features

Simultaneous Temperature & Humidity Display
Two-line LED display shows both parameters at once, no screen switching required.
External Sensor Configuration
Separates the sensing point from the display, allowing sensor placement wherever the measurement is most representative.
0.1 Resolution
Fine resolution on both temperature and humidity readings, enabling operators to observe small condition changes.
In-Built Buzzer Alarm
Field-programmable alert for temperature or humidity readings exceeding set limits.
RS-485 Modbus Communication
Supports integration with BMS, SCADA, or PLC systems for centralized monitoring.
Optional 4-20mA Retransmission Output
Analog output option for compatible monitoring and control systems.
Stainless Steel Front Flush Plate
Aesthetic, durable finish suited for modular panel wall or brick wall installation.
Minimum Cabling Design
Supports easy flush mounting with reduced wiring requirements.

Applications

Pharmaceutical Cleanrooms
Monitors temperature and humidity across manufacturing and packaging areas where environmental stability affects product quality.
Hospitals
Tracks environmental conditions in clinical spaces where temperature and humidity control supports patient safety and comfort.
Laboratories
Supports environmental monitoring in lab spaces where process or sample stability depends on consistent conditions.
Pharmacies
Monitors storage and compounding area conditions relevant to medication stability.
Isolation Rooms
Tracks temperature and humidity alongside other environmental controls in patient isolation settings.

AI-RHTm-E vs AI-RHTm (Built-In Sensor)

Ace Instruments offers this humidity-temperature monitor in two sensor configurations, and the difference comes down entirely to where the sensor sits relative to the display.

AI-RHTm

Uses an integrated sensor, mounted directly on the front stainless steel plate alongside the display. This suits installations where the measurement point and the display point are the same location, straightforward wall mounting with no separate sensor cable to route.

AI-RHTm-E (this model)

Uses an external sensor, separate from the display unit. Choose this configuration when the ideal measurement location and the ideal viewing location are not the same spot, for example, sensing inside a controlled area while keeping the display accessible outside it, or positioning the sensor where readings are most representative of actual room conditions rather than wherever happens to be convenient for viewing.

In short, if a single flush-mounted unit works for both sensing and viewing, the AI-RHTm is the simpler choice. If that flexibility of separate placement is needed, the AI-RHTm-E is built for it.

Need Differential Pressure Too? Consider the AI-CRM3-1-1

The AI-RHTm-E is purpose-built for applications where temperature and humidity are the only parameters that need to be displayed. If your application also requires differential pressure monitoring, between a cleanroom and an adjacent corridor, for instance, the AI-CRM3-1-1 Clean Room Monitor with External Sensor covers all three parameters (temperature, humidity, and differential pressure) in a single instrument, using the same external sensor concept for temperature and humidity, with a built-in differential pressure sensor and rear hose nipple connections. Choosing between the two comes down to what your application needs to monitor: the AI-RHTm-E for temperature and humidity alone, or the AI-CRM3-1-1 when pressurisation control is also part of the compliance picture.

Specifications

Parameter	Specification
Temperature Range	0.0 to 50.0°C
Temperature Accuracy	±0.5°C
Humidity Range	0.0 to 99.9% RH
Humidity Accuracy	±1.8% RH (over 10 to 95% RH range)
Resolution	0.1 for both temperature and humidity
Display	Two-line red 7-segment LED, 1 inch display height
Sensor Configuration	External temperature/humidity sensor
Communication	RS-485 Modbus; optional 4-20mA analog retransmission output
Power Supply	24 VDC, 250 mA
Mounting	Flush mounting, suited for modular wall panel or brick wall installation

Frequently Asked Questions

What is the AI-RHTm-E Clean Room Humidity-Temperature Monitor with External Sensor?

The AI-RHTm-E is a cleanroom humidity and temperature monitoring instrument designed for pharmaceutical cleanrooms and other controlled environments. It continuously measures temperature and relative humidity and displays both readings locally for easy observation.

What parameters does the AI-RHTm-E measure?

The AI-RHTm-E measures two important environmental parameters, temperature and relative humidity. These help operators monitor and maintain the required environmental conditions inside cleanrooms.

Why is temperature and humidity monitoring important in cleanrooms?

Temperature and humidity can affect the stability of processes, materials, equipment, and environmental conditions within a cleanroom. Continuous monitoring helps operators identify deviations from the required conditions and take corrective action when necessary.

What is the temperature measurement range?

The AI-RHTm-E has a temperature measurement range of 0.0 to 50.0°C. The specified temperature accuracy is ±0.5°C over this range.

What is the humidity measurement range?

The AI-RHTm-E measures relative humidity from 0.0 to 99.9% RH. The specified humidity accuracy is ±1.8% RH over the 10 to 95% RH range.

What resolution does the AI-RHTm-E provide?

The monitor provides a resolution of 0.1 for both temperature and relative humidity measurements, allowing operators to observe small changes in cleanroom conditions.

How are the temperature and humidity readings displayed?

The AI-RHTm-E uses a two-line red 7-segment LED display. The upper line displays temperature in °C, while the lower line displays relative humidity in % RH. The display height is 1 inch.

What is the advantage of the external sensor configuration?

The external sensor arrangement allows temperature and humidity to be measured at the required location while the display can remain positioned for convenient observation. This can be useful in cleanroom installations where the sensing point and viewing point need to be separated.

Is the AI-RHTm-E suitable for pharmaceutical cleanrooms?

Yes. The product is specifically described by Ace Instruments as a Pharma Clean Room Humidity-Temperature Monitor and is designed for measuring temperature and humidity in pharmaceutical cleanroom applications.

Can the AI-RHTm-E be installed in modular cleanroom walls?

Yes. The monitor is designed for easy flush mounting in modular wall panels or brick walls used in cleanroom installations. The design is also intended to minimize cabling requirements.

What type of power supply does the AI-RHTm-E require?

The specified supply requirement is 24 VDC with a current requirement of 250 mA.

Where can the AI-RHTm-E be used?

The AI-RHTm-E is intended primarily for pharmaceutical cleanrooms and controlled environments where temperature and relative humidity need to be continuously observed. It can also be considered for other applications requiring local temperature and humidity indication, subject to the specified measurement range and installation conditions.

How does the AI-RHTm-E help cleanroom operators?

The monitor provides a continuous local indication of temperature and relative humidity, allowing operators to quickly identify changes in environmental conditions without relying on manual measurement. The two-line display makes both readings available simultaneously.

Does the AI-RHTm-E measure both temperature and humidity simultaneously?

Yes. Temperature and relative humidity are displayed simultaneously on the two-line LED display, allowing operators to view both environmental parameters at the same time.

What are the main advantages of the AI-RHTm-E?

Simultaneous temperature and humidity indication, 0.1 resolution for both parameters, 0.0 to 50.0°C temperature range, 0.0 to 99.9% RH humidity range, a two-line red LED display, external sensor configuration, flush-mounting capability, suitability for modular cleanroom walls, a low-cabling installation concept, and 24 VDC operation.

Who typically uses the AI-RHTm-E?

The AI-RHTm-E is particularly suitable for pharmaceutical manufacturers, cleanroom operators, facility managers, HVAC teams, cleanroom consultants, and engineering teams responsible for maintaining controlled environmental conditions.

How is the AI-RHTm-E different from a combined cleanroom monitor?

The AI-RHTm-E focuses specifically on temperature and relative humidity monitoring. It is therefore suitable when these two parameters are the primary environmental conditions that need to be displayed. Applications requiring additional parameters such as differential pressure may require a different cleanroom monitoring model, see the comparison above for the AI-CRM3-1-1.

How do I choose the right cleanroom temperature and humidity monitor?

Selection should be based on the required temperature and humidity ranges, measurement accuracy, display requirements, installation arrangement, available power supply, and cleanroom wall configuration. For applications requiring dedicated temperature and humidity monitoring with an external sensor and flush-mounted display, the AI-RHTm-E is designed specifically for this type of cleanroom installation.