Digital Temperature and Humidity Meter with Reference Probe

What is the Digital Temperature and Humidity Meter with Reference Probe?

A handheld or benchtop meter with a capacitive humidity and Pt100 temperature probe that measures relative humidity, temperature and dew point for environmental verification. It is the right choice for chamber verification and conditioning rooms.

Overview

This meter uses a capacitive polymer humidity sensor and a Pt100 or thermistor temperature sensor in a probe, with a transmitter that calculates relative humidity, temperature, dew point, wet bulb and absolute humidity. Accuracy on reference-grade probes is typically 1 percent RH from 0 to 90 percent and 0.1 C, with a long-term stability of 1 percent RH per year. Probes can be calibrated against saturated salt solutions or in a humidity generator. The meter can be used to verify environmental chambers, conditioning rooms for paper and plastics, stability cabinets and cleanroom monitoring. Filters protect the sensor from dust and condensation, and heated probes prevent condensation in high humidity. Probes should be recalibrated annually and avoided in chemicals like solvents, which can poison polymer sensors.

How does it work?

A measurement system converts a physical variable into an electrical signal with a sensor, conditions and digitizes that signal, applies calibration coefficients and displays or records the result. Electromagnetic force restoration balances compensate the load with a current through a coil. Strain-gauge or piezoresistive sensors turn pressure and force into bridge voltages. Platinum resistance thermometers and thermocouples produce resistance or voltage that varies with temperature. Capacitive polymer sensors change capacitance with relative humidity. The system accuracy combines sensor quality, amplifier stability, analog-to-digital resolution, temperature effects and calibration uncertainty. Traceability to national standards is established by periodic calibration with higher-accuracy references. Data loggers and software add time-stamped records, limit alarms and statistical analysis for quality documentation.

What are the key features?

• Capacitive polymer humidity sensor with Pt100 temperature gives accuracy of 1 percent RH.
• Calculates dew point, wet bulb and absolute humidity from a single measurement.
• Interchangeable probes suit rooms, ducts, chambers and small sample enclosures.
• Heated probe option prevents condensation in humid environments.
• On-site adjustment with saturated salt references supports rapid verification.
• Data logging with USB export provides traceable records for audits.

What are the technical specifications?

A typical digital temperature and humidity meter with reference probe configuration offers humidity range of 0–100 % RH, humidity accuracy of ±1 % RH (0–90 % RH), temperature range of −40 to 180 °C (probe dependent), temperature accuracy of ±0.1 °C, dew point range of −40 to 100 °C and long-term stability of ≤1 % RH per year. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Digital Temperature and Humidity Meter with Reference Probe is used in environmental chamber verification, paper and plastic conditioning rooms, stability cabinet monitoring and cleanroom and storage area checks. Across the wider Measurement Systems class, laboratories also deploy it for formulation and sample weighing, calibration of process gauges and storage and cold chain monitoring.

Which standards and certifications apply?

Relevant standards and methods include ISO/IEC 17025, ISO 10012, OIML R 76-1, OIML R 111-1, EURAMET cg-18, IEC 60751, ISO 7500-1 and JJG 1036. Certification candidates for this model are CE, RoHS and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install measurement systems in a stable environment appropriate to their accuracy class. Balances need a vibration-free table, level mounting and protection from drafts and temperature swings. Allow warm-up before use. Verify each instrument with check weights or reference devices on a routine schedule, and send it for full calibration at intervals defined by your quality system, typically annually. Keep calibration certificates, as-found and as-left data and uncertainty budgets. Protect sensors from overload, shock and incompatible media. Label instruments with calibration status and due dates, and remove those out of tolerance from service. Train operators on correct handling, such as using tweezers for weights and stabilizing before reading.

How do I select the right Digital Temperature and Humidity Meter with Reference Probe?

Choose a reference-grade temperature and humidity meter when verifying chambers or conditioning rooms at tolerances of a few percent RH. Choose a chilled mirror hygrometer for primary reference. In an RFQ specify humidity and temperature ranges, accuracy, probe style, calibration certificate points and need for data logging.

How does it compare with other Measurement Systems variants?

Select the system by the variable, range and tolerance to be verified. Specify the resolution and accuracy needed at the working point, not only the full-scale value, and keep the instrument uncertainty to about one tenth to one third of the tolerance. For weighing, consider readability, capacity, repeatability and draft control. For pressure and temperature, check sensor type, media compatibility and environmental conditions. For monitoring, consider number of channels, logging interval, alarms and software features for audit trails. Confirm that calibration certificates are traceable and that calibration can be performed locally. Also consider ruggedness, battery life, display readability, connectivity and the ability to export data for regulatory or customer audits.