Specify humidity together with temperature
Send the requested humidity points in %RH and the temperature at which they apply. For example, an inspection room may have a humidity limit linked to a specific room temperature. Include the limits in your procedure and say if the meter is used to record trends or make an acceptance decision.
Keep track of detachable sensors
Quote the probe model and serial number as well as the display or transmitter. If one display serves several probes, list each pairing. For a wall transmitter, identify the output that the building system reads and whether your request includes the display, the output or the full monitoring loop.
Reading two sensors on one certificate
A thermo-hygrometer may use a detachable humidity probe with its own temperature element. Ask for the report to identify that probe and the readout together. If temperature and relative humidity both support your environmental limits, list the required points for each quantity. The humidity result should retain the temperature at which it was obtained, so a later reviewer can understand the comparison.
Tell RTS whether you need the condition before adjustment recorded. A recent disagreement with a wall monitor should be described using the dates, locations and existing readings; the two sensors may have been at different temperatures or in different airflow. Include exposure to condensation, dust or process vapours if it is known. These details help the team decide whether the request needs inspection as well as calibration.
Humidity transmitters and remote sensors
For a wall or duct transmitter, identify the humidity sensor, any temperature channel and the output read by the building or process system. Send the configured range for each output, with the measurement points required. Say whether the enquiry covers the local display, an analogue or digital output, or the complete installed indication.
A remote sensor and its transmitter should be identified as a pair. Include any change of probe or output scaling since the last report. Checking an electrical receiving channel alone does not test the humidity-sensing element. RTS will review the required humidity and temperature conditions before agreeing the measurement boundary.
Keep the room record continuous
Tell us whether a spare can maintain the room record while this meter is away, or whether a detachable probe can be released on its own. Keep the probe cap, readout and cable identified. Confirm the return address for each set when instruments belong to several laboratories.
Chilled mirror hygrometers
A chilled mirror hygrometer measures a condensation-related temperature and may use a separate air-temperature probe to report relative humidity. Identify both components and state the reported quantity needed. Include the sample gas, pressure and connection arrangement. RTS must review the humidity reference and accepted points before booking. Keep any mirror maintenance history with the request, since the measurement setup should be clear before results are compared.
Dew point meters
A dew point meter request should state the gas, operating pressure and whether the reported value is a dew or frost point. Include the sample-cell arrangement and any pressure correction used in the display. A value measured after pressure reduction is not interchangeable with an unspecified process-pressure result. RTS will review the method, reference conditions and service route for the actual sampling arrangement before accepting the enquiry.
Humidity generators used as references
For a humidity generator, describe the generated quantity, working temperatures, pressure arrangement and output chamber or manifold. List the reference probes and any control channels requiring separate evidence. A display calibration alone does not demonstrate the moisture content delivered to the test instrument. RTS can review the generator as a reference system, with a defined method and agreed conditions, rather than applying an ordinary hygrometer description to the whole apparatus.
Psychrometers
A psychrometer enquiry should identify the dry- and wet-bulb thermometers, ventilation arrangement and the calculation used to obtain humidity. Retain the wick and water requirements from the operating procedure as part of the configuration record. Calibration of the two temperature indications and evaluation of the resulting humidity are different tasks. Ask RTS to review which results can be provided, with the conditions and calculation clearly stated.