At present, as of September 1, 2015, for heptafluoropropane fire extinguishing devices, fire products listed in this mandatory product certification catalog that have not obtained a mandatory product certification certificate and have not been marked with a mandatory product certification mark are not allowed to be manufactured, sold, imported, or used in other business activities. Mandatory 3C certification is required for gas fire extinguishing equipment, and mandatory 3C certification for fire protection products mainly includes: fire alarm products, fire protection products, fire extinguishing equipment products, fire equipment products, etc. The implementation rules are issued by the China National Certification and Accreditation Administration.

To meet the requirements of 3C certification for fire protection products, most companies have designed and developed complete sets of heptafluoropropane testing equipment and dew point testers that meet the certification requirements based on the current actual production situation in the fire protection industry. The process of most manufacturers of heptafluoropropane fire extinguishing devices is as follows: bottle group cleaning, drying, vacuuming, replacement, liquid filling, etc. Currently, 3C requirements require that the dew point inside the steel cylinder after replacement should be below -60 ℃ (with a moisture content of less than 10PPM). There are also relevant regulations that the design specifications for clean gas fire extinguishing systems using heptafluoropropane (HFC-227ea) should meet the following technical indicators: purity ≥ 99.6% (mol/mol); acidity ≤ 3ppm; Water content ≤ 10ppm; Non volatile residue ≤ 0.01%; Suspension or sediment: invisible.

1、 Function Overview

The SLS-817 dew point meter is based on imported high-precision dew point sensors, which have been further developed and improved by our company. It has fast response speed and high sensitivity. Powered by batteries or AC220V, with a low-power and portable design, it is easy to use and operate. It can measure the trace moisture content in various inert gases and is suitable for various occasions with strict control requirements for moisture content. The dew point sensor is the core, and the sampled data is true and reliable. The instrument adopts a touch color LCD display screen, with a friendly, beautiful interface and easy operation.

The sensor is reliable in full range measurement and has long-term stability. It is not affected by dust particles and most chemical pollutants, making it highly suitable for use in industrial environments.

This precision dew point meter is an ideal choice for industrial environments with low dew points and the need to control dry points. It has a chemical removal option, which enables the dew point meter to perform stable measurements in environments with high concentrations of chemicals and cleaning agents, ensuring accurate measurements between each calibration interval.

Application fields:

Petrochemical, natural gas, industrial gases, semiconductor industry, drying industry, food industry, power industry, machinery manufacturing, air separation industry, pharmaceutical industry.

2、 Main features

• 4.3-inch TFT touch screen design
• 32-bit ARM microcontroller
• ● Separate design of air and electrical circuits
• ● Large capacity storage function, recording data can be displayed in the form of curves or lists.
• ● Digital display of battery level
• Good repeatability and fast response speed
• ● Automatic slope calibration
• Color LCD display dew point temperature and volume ratio (PPM/V)
• Advanced probe protection function
• ● Anti pollution and anti-interference
• ● High sensitivity and good stability
• ● Small and beautiful size, easy to carry

3、 Technical indicators

Measurement range: Dew point -60 ℃~+60 ℃/-80 ℃~+20 ℃ (supports ppmv)

Dew point accuracy: ± 2 ℃

(When the dew point temperature is below 0 ℃, the sensor output is frost point)

Response time 63% [90%]

+20→-20 ℃ Td 5s[45s]

-20→-60 ℃ Td 10s[240s]

Resolution: Dew point 0.1 ℃ or 0.1ppm

Repeatability: ± 0.2 ℃

Gas flow rate: SF6 is regulated at 0.7-0.9L/min

Probe protection: Stainless steel sintered filter screen

Working voltage: 110-220VAC, AC/DC dual-use

Lithium battery, AC/DC dual-use, automatic switching, overcharge and over discharge protection function

Storage temperature level: -40~+70 ℃

Output interface: USB specification

Operating environment: Temperature: -25~+60 ℃

Pressure: 0-10 bar

Sample gas flow rate: No impact

Volume weight: 372 × 266.5 × 134.5 (mm), 3.5kg

4、 Introduction to the appearance of the instrument

5、 Page display