73 Type Sintered Sight Glass – Stainless Steel Weld Neck Inline Filter View Window (– 60 ° C to +300 ° C, 40 Bar)

• Customization: Available
• After-sales Service: Long Time
• Warranty: Long Time
• Certification: CE, ISO9001/ISO14001/Ej/T9001/Gjb9001c
• Shape: Round
• Head Code: Round
• Connection: Welding
• Material: Stainless Steel
• Application: Bioreactors, Laboratory Mixers,etc.
• Pressure Resistance: 40bar,Customizable
• Temperature Resistance: -60ºC-300ºC
• Material Certificates: Certificate of Conformity En 10204-3.1b or 3.1c
• Sintered Sight Glass: Optional
• Transport Package: in Carton, Wooden Case
• Specification: Customized
• Origin: Jiangsu
• Production Capacity: 100000+

Product Description

73 Type Sintered Sight Glass – Hygienic Stainless-Steel Inline Filter View Window

 The 73 Type Sintered Sight Glass by Lumistar addresses critical visibility challenges in chemical, pharmaceutical, and food-grade processes. Standard sight windows often clog with suspended solids or microbial residues, causing unscheduled shutdowns and contamination risks. Operators face increased downtime when manual cleaning or gasket replacement is required, while traditional units struggle under extreme temperatures (–60 °C to +300 °C) and high pressure (up to 40 bar).
 
Lumistar's Effective Solution
 
Integrated 316L Sintered Filter Plate: A high-precision stainless-steel plate (2 µm, 5 µm, or 10 µm) is fused directly behind tempered borosilicate glass (per DIN 7080), trapping solids before they reach the viewing area.
 
Hygienic Inline Weld-Neck Design: Conforms to DIN 28121 with weld-neck flange compatibility—no additional flange gaps, ensuring Ra ≤ 0.8 µm surface finish that meets FDA, GMP, and 3A sanitary standards.
 
Wide Operating Envelope: Rated for –60 °C to +300 °C and 16 bar standard (40 bar high-pressure variants), with body materials ranging from carbon steel to Duplex 1.4462 and Hastelloy C-22/C-4 for extreme corrosion resistance.
 
Dual-Seal Protection: EPDM/PTFE O-rings guarantee leak-proof performance, reducing maintenance frequency and enhancing safety.
 
Optimize your process monitoring with Lumistar's 73 Type Sintered Sight Glass—designed for reliable, hygienic filtration and clear visibility in the most demanding industrial environments.

Applications

As a replacement for conventional glass discs in the followingassemblies:
 Circular sight ports to DlN 28120 or similar
 Circular sight ports to DlN 28121
 Screwed sight glasses similar to DIN 11851
 Sight flow indicators

Key Configurations

 Advantages:  Reliability against total failure-the possibility of suddenunexpected rupture is totally exclude
                          High resistance to bending and over-tightening offerssimple and fast installation with no risk of breakaged
                          Extreme resistance to impact, pressure and temperatureReusable in the same or other applications-conventionalglass is not
                         Wide acceptance in the European & American chemicalindustries
Operating conditions: Temperature: -60°C to +300°
 Pressure: Up to 64 bar Higher pressures possible

73 type sintered sight glass Product Performance
Applications:	As a replacement for conventional glass discs in the followingassemblies:
	Circular sight ports to DlN 28120 or similar
	Circular sight ports to DlN 28121
	Screwed sight glasses similar to DIN 11851
	Sight flow indicators
Advantages:	Reliability against total failure-the possibility of suddenunexpected rupture is totally exclude
	High resistance to bending and over-tightening offerssimple and fast installation with no risk of breakaged
	Extreme resistance to impact, pressure and temperatureReusable in the same or other applications-conventionalglass is not
	Wide acceptance in the European & American chemicalindustries
Operating conditions:	Temperature: -60°C to +300°
	Pressure: Up to 64 bar Higher pressures possible
Approvals and technical data:	Manufactured and tested in conformance with:
	Pressure Equipment Directive 97/23/EG 02/98, ModuleH/H1 (DIN/EN/ISO 9001
	AD Standards WO/TRD 100
	Factory Mutual Approval
	Sight glass fused to metal conforming to DlN 7079
	Borosilicate glass to DlN 7080
Material certifcates	Certificate of conformity to EN 10204-3.1B or 3.1A

Ring materials:	Carbon Steel (1.0570): -10°C to +300°C
	Duplex Stainless Steel (1.4462): -30°C to +280°C
	Hastelloy C-22 (2.4602): -60°C to +300°C
	Hastelloy C-4 (2.4610): -60'C to +300°C
	Other materials available

Technical Specifications

We can customize according to customer needs.

d1	d2	Pressure rating
		10 bar	16 bar	25 bar	40 bar	64 bar
		S	S	S	S	S
45	25	10	10	10	10	15
60	35	10	10	12	15	18
63	35	10	10	12	15	20
80	45	10	12	15	20	22
100	55	12	15	20	25	28
125	65	15	20	25	25	28
150	70	20	25	30	30	32
175	80	20	25	30	30	35
200	100	25	30	30	35	40
250	120	30	30	35	40	-

Multi system certification

Having over 10 invention patents More than 50 utility model patents

Industry Users

Company Profile

Lumistar Special Glass Technology Co., Ltd.

Lumistar Special Glass Technology Co., Ltd. is a national high-tech enterprise mainly engaged in the research and development, design, manufacturing, and processing of various types of ultra-high pressure glass windows and safety protection equipment, including high temperature and high pressure glass, ultra-high pressure glass tubes, ultra-high pressure glass mirrors, ultra-low temperature glass, oil well ultra-high pressure glass blasting discs, sapphire glass, microcrystalline ceramic glass, pipeline mirrors, pressure vessel mirrors, high vacuum observation windows, ultra-high pressure alkali resistant mica glass mirrors, high pressure level gauge aluminum silicon glass, explosion-proof spotlights, bulletproof and explosion-proof glass, sintered mirrors, bulletproof security posts, and bulletproof transparent materials.

FAQ

Q:  Do you have a factory?
A: Yes, we have a factory in Jiangsu. Welcome to visit our company and factory. We are a professional manufacturer and provide OEM/ODM services to customers.

Q: Could I get some samples, and how?
A: No problem, we provide free samples, and it is only needed for you to pay for the shipping charge.

Q: Can the company customize the specifications we want? 
A: Our company can customize various safety glass sight glasses with high temperature resistance, high pressure resistance, chemical resistance, and excellent thermal shock resistance according to customer needs, and issue EN10204-3.1 or 3.2 factory quality certificates, or according to customer needs Invite certification agencies such as TUV to come and witness the test.Our company can also provide OEM and ODM brands for users, making it convenient for agents from various countries to set up their own glass brands.

Q: Can you give me some discount?
A: Usually the discount depends on the quantity. However we can discuss it.

Q: How do you deliver the qoods?
A:We can choose suitable sea freight, air freight, and international express delivery according to the customer's needs, andselect the most economical and fastest logistics delivery method based on the actual situation of the goods