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Liquid Indicators & Moisture-Liquid Indicators

Liquid Indicators & Moisture-Liquid Indicators

Liquid Indicators & Moisture-Liquid Indicators

Product catalog summary
Construction
New liquid indicators (series 38) and liquid/moisture indicators (series 39) are designed with a hermetic construction to prevent refrigerant leaks. The glass lens is secured in a brass body using an edge calking operation. Key materials include hot forged brass for the body, copper for solder connections, glass for the lens, and PTFE for gaskets. Series 3770, 3771, 3780, and 3781 have lenses fused onto a steel ring with surface protection.
Applications
These indicators are classified as "Pressure accessories" under the Pressure Equipment Directive 97/23/EC and are used in commercial refrigeration and conditioning systems using Group II refrigerants. Series 3780 is excluded from the directive as they are piping components. The indicators allow for inspection of refrigerant fluid conditions, ensuring regular flow and moisture levels, and checking oil return to the compressor.
Operation
The indicators feature a sensitive element that changes color from green to yellow based on moisture levels. Green indicates acceptable moisture levels, while yellow suggests the need to replace the dehydrator filter. Bubbles under the lens indicate partial evaporation of the refrigerant fluid.
Installation
During start-up, the indicator may show yellow due to air exposure. Once moisture levels are reduced, the indicator returns to green, indicating equilibrium. If yellow persists, further measures are needed. Proper brazing techniques should be used to avoid damage during installation.
Tables and Data
  • Table 1: Shows moisture content in refrigerant fluids with color indicators for different refrigerants (R22, R134a, R404A, R407C, R410A, R507).
  • Table 2: Lists general characteristics of liquid indicators, including catalogue numbers, connection types, and pressure ratings.
  • Table 3: Provides characteristics of liquid/moisture indicators, including dimensions and connection types.
  • Table 4: Details dimensions and weights of various indicator models.
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Catalog excerpts

Liquid Indicators & Moisture-Liquid Indicators-1

Liquid Indicators & Moisture-Liquid Indicators

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Liquid Indicators & Moisture-Liquid Indicators-2

78 CONSTRUCTION New liquid indicators, series 38, and new liquid/moisture indicators, series 39, are manufactured in a total hermetic construction to avoid any possible refigerant leaks. The glass “lens”, with its proper gasket, is housed into the brass body and is fixed in this seat with an edge calking operation. The main parts of the indicators are made with the following materials: – hot forged brass EN 12420 – CW 617N for body; – copper tube EN 12735-1 – Cu-DHP for solder connections; – Glass for lens; – PTFE for outlet seal gaskets; Liquid/moisture indicators series 3770, 3771, 3780 and...

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Liquid Indicators & Moisture-Liquid Indicators-3

79 TABLE 2: General Characteristics of liquid indicators Catalogue number Type SAE Flare RIsk Category according to PED ODS PS [bar] TS [°C] Ø [mm] max. Ø [in.] min. Art. 3.3 Connections malemale soldering malefemale 3810/22 3810/33 3810/44 3810/55 3810/66 3840/2 3840/3 3840/M10 3840/M12 3840/4 3840/5 3840/M18 3840/6 3840/7 3840/9 3850/22 3850/33 3850/44 3850/55 3850/66 1/4" 3/8" 1/2" 5/8" 3/4" – – – – – – – – – – 1/4" 3/8" 1/2" 5/8" 3/4 – – – – – 1/4" 3/8" – – 1/2" 5/8" – 3/4" 7/8" 1.1/8" – – – – – – – – – – – – 10 12 – 16 18 – 22 – – – – – – – 30 +110 45 achieve equilibrium. However, the moisture...

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Liquid Indicators & Moisture-Liquid Indicators-6

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