Elcometer G116A-1 - User Manual

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Elcometer 116 Whirling & Sling Hygrometer

The Elcometer 116 Whirling and Sling Hygrometers are designed to determine the dew point and relative humidity (RH) at

any given time.

The Elcometer 116A Whirling Hygrometer is available in Celsius scale. A guide for Relative Humidity (RH) determination is

supplied with each instrument and the dewpoint can accurately be calculated using the Elcometer 114 Dewpoint Calculator.

The Elcometer 116C Sling Hygrometer, shown as the black unit in the photograph, is a convenient, self-contained

instrument with an inbuilt slide rule for the calculation of %RH and dewpoint. This hygrometer has spirit filled thermometers

and is available in °C or °F scales.

• Manual operation, no power supply required

• Spirit filled thermometers

Test Method and Operation

Hygrometers use a manual technique to measure Relative Humidity (RH) and dewpoint.

These instruments consist of two thermometers, the bulb of one being covered by a wick. The wick is saturated by filling

the plastic container with water. Hold the Hygrometer by the handle and whirl through 360º facing the wind or any airflow

for about 90 seconds.

This is repeated until the wet bulb thermometer cools down to a constant frame temperature and two consecutive pairs of

readings agree.

The RH and dewpoint are then calculated from the wet and dry bulb temperature readings using the Dew Point Table or

the Elcometer 114 Dewpoint Calculator. Ensure the wet bulb wick dips into the small water container attached to the

Hygrometer frame. Check the water level each time before using.

Technical Specifications

Part Number Description

G116A---1 Elcometer 116A Whirling Hygrometer - Metric °C

G116C---1 Elcometer 116C Sling Hygrometer - Metric °C

Measuring Range -5°C to 50°C

Dimensions 17 x 22mm

Weight 300g

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Summary

Test Method and Operation

Hygrometer Usage

Explains the manual technique to measure Relative Humidity (RH) and dewpoint using whirling and sling hygrometers.

The Elcometer 116 Whirling & Sling Hygrometer is a manual instrument designed to determine dew point and relative humidity (RH) at any given time. It is available in two main models: the Elcometer 116A Whirling Hygrometer and the Elcometer 116C Sling Hygrometer. Both models utilize spirit-filled thermometers for temperature measurement.

Function Description:

The primary function of the Elcometer 116 series is to measure relative humidity and dew point. This is achieved through a psychrometric method involving two thermometers: a dry bulb thermometer and a wet bulb thermometer. The wet bulb thermometer has its bulb covered by a wick, which is saturated with water. By whirling or slinging the instrument, air flows over both thermometers, causing evaporative cooling of the wet bulb. The difference in temperature between the dry bulb and wet bulb readings, along with the dry bulb temperature, allows for the calculation of RH and dew point.

The Elcometer 116A Whirling Hygrometer is supplied with a guide for RH determination, and the dew point can be calculated using the Elcometer 114 Dewpoint Calculator. This model is available with a Celsius scale.

The Elcometer 116C Sling Hygrometer is a more self-contained unit, featuring an inbuilt slide rule for direct calculation of %RH and dew point. This model is available in both Celsius (°C) and Fahrenheit (°F) scales. The black unit shown in the photograph represents the Elcometer 116C Sling Hygrometer.

Important Technical Specifications:

Part Numbers:
- G116A---1: Elcometer 116A Whirling Hygrometer - Metric °C
- G116C---1: Elcometer 116C Sling Hygrometer - Metric °C
Measuring Range: -5°C to 50°C
Dimensions: 17 x 22mm (Note: This dimension seems unusually small for a hygrometer and might refer to a specific component or be an error in the provided text. Typically, hygrometers of this type are larger.)
Weight: 300g
Thermometer Type: Spirit-filled thermometers
Operation: Manual operation, no external power supply required.

Usage Features:

The operation of both hygrometer types follows a similar principle:

Preparation: The wick of the wet bulb thermometer must be saturated by filling the plastic container with water. It is crucial to ensure the wet bulb wick dips into the small water container attached to the hygrometer frame and to check the water level before each use.
Whirling/Slinging: Hold the hygrometer by its handle and whirl it through 360 degrees, ensuring it faces the wind or any available airflow. This action should be performed for approximately 90 seconds.
Reading Stability: This whirling process is repeated until the wet bulb thermometer cools down to a constant temperature. This stability is confirmed when two consecutive pairs of readings (dry bulb and wet bulb) agree.
Calculation: Once stable readings are obtained, the RH and dew point are calculated.
- For the Elcometer 116A, this involves using the provided Dew Point Table or the Elcometer 114 Dewpoint Calculator.
- For the Elcometer 116C, the inbuilt slide rule simplifies this calculation directly.

The manual operation and lack of power requirement make these instruments highly portable and suitable for field use where power sources may not be readily available. The design emphasizes ease of use and reliability through a well-established psychrometric method.

Maintenance Features:

Maintenance primarily involves ensuring the wicks are clean and properly saturated and replacing them when necessary. The accessories list provides details on spare parts:

Spare Thermometers:
- T1164441-: Elcometer 116A Spare Thermometer - °C
- T11631224: Elcometer 116C Spare Thermometer - °C (Pack of 2)
Wicks:
- T1164487-: Elcometer 116A Wicks (Pack of 5)
- T11631168: Elcometer 116C Wicks (Pack of 4)
Distilled Water: Essential for saturating the wicks to ensure accurate readings.
- T13827259: Pure Distilled Water - 250ml
- T13827494: Pure Distilled Water - 1000ml
Replacement Slide Rule:
- T11600212: Elcometer 116A Replacement Slide Rule (Note: This might be a typo and refer to a table or chart for the 116A, as the 116C has the inbuilt slide rule).

Regular checking of the water level in the container and ensuring the wick is clean and properly positioned are crucial for accurate measurements. The use of pure distilled water is recommended to prevent mineral buildup on the wick, which could affect evaporative cooling and lead to inaccurate readings. The availability of spare parts ensures the longevity and continued accuracy of the instrument.