DWYER INSTRUMENTS RHP-2D10 Relative Temperature & Humidity Transmitter / Transmitter

Dwyer Instruments RHP-2D10 transmitter / transducer is designed for outdoor temperature & relative humidity reference, air economisers and pool room humidity monitoring. It offers high accuracy, long-term stability, flexibility and reliable operation.

Working Mechanism:

• The capacitance or resistance of air samples is used to measure the temperature and humidity of the environment.
• The sensor measures the moisture quantity in the air using capacitive technology. This type of measurement depends on an electrical field created between two electrical conductors and a non-conductive polymer sheet placed in between them.
• As moisture from the air gathers on the film, the voltage levels between the two plates vary.
• After accounting for the air temperature, this alteration is then transformed into a computerised measurement of the relative humidity of the air.
• Resistive humidity sensors monitor humidity by passing ionised salts between two electrodes.
• The salt ions gauge the electrical resistance of atoms. The resistance of the electrodes varies along with the humidity levels.
• A dual sensor system is used by a thermal sensor to monitor humidity.
• While one thermal sensor is free to measure ambient air, the other is enclosed in a layer of dry nitrogen.
• The difference between the two measurement results determines how much moisture is in the air.

Features:

• Dwyer Instruments RHP-2D10 relative temperature & humidity transducer / transmitter has NEMA 4X rated enclosure to protect against corrosion, splashing water and windblown dust or rain.
• It features polymer construction to resist condensation, high humidity, fog and contaminants.
• The unique design combines the voltage or current humidity transmitter output with a passive temperature thermistor or RTD output sensor.
• The Series RHP's cutting-edge sensor technology allows it to recover from 100 percent saturation and is completely calibration-free.
• Quick service and a decrease in full unit inventory are made possible by the field replaceable sensor and detachable filter of the unit.
• The metal mounting flange on this duct mount model shortens the time it takes to attach the transmitter to the duct.
• It can be ordered with just one current or voltage output for humidity or it can be factory customised also to have a voltage output, a passive RTD output or a temperature output using a thermistor. Without additional calibration, the RTD and thermistor outputs can be used interchangeably in the field.

Compatible Accessories:

• Dwyer A-449 Remote Displays: They are two-line alphanumeric LCD screens engineered for the user to easily read the temperature and humidity at once.

Standards and Approvals:

• CE
• RoHS

Frequently Asked Questions:

Q. How to install this relative humidity transducer?

A.

• Drill a hole in the duct at the desired location.
• Through the opening, insert the transmitter probe so that the mounting flange is flush with the duct.
• The mounting flange should be fastened to the duct with three 1/2-inch pan head sheet metal screws.
• Avoid over tightening.
• To access the wire terminals, remove the top screw cover.

Q. What are the important points to consider before installing this transmitter?

A.

• Before installation, disconnect the power source to avoid electrical shock and equipment damage.
• Precautions for electrostatic discharge should be used, such as wrist straps during wiring and installation to guard against equipment damage.
• Avoid areas where there is an excess of moisture, vibration or corrosive vapours.
• Do not exceed the electrical ratings.
• The relative humidity measurement of the transmitter should not be impacted by fans, corners, heating and cooling coils or other equipment.
• Additionally, it needs to be installed where it will receive enough airflow to function properly.
• To keep moisture out, the transmitter should be positioned so that the conduit connection faces downward.

Q. How to perform field sensor replacements?

A.

• Remove the plastic cover or sintered filter.
• Remove and discard old sensors.
• Replace the sensor, ensuring that all six pins mate correctly with the socket and that the boards are correctly aligned.
• Replace the plastic cover or sintered filter.