Sight Glass
Available in both Sweat (ODF) and Flare (SAE)- configurations, the full brass body sight glass uses special litmus paper that returns to its original color once the system is cleaned, eliminating the need to change the eye.
Design and Features
- Versatile Connection Options
NDL moisture indicators feature a durable brass body with extended copper ends for sweat connections and standard flare ends. The tube ends are oven-brazed to the brass body, ensuring a secure fit. With a maximum working pressure of 600 PSI, they are ideal for demanding refrigeration applications. - Reliability
Designed for bi-directional flow, these indicators ensure dependable operation in various refrigeration environments. The leak-proof design minimizes the risk of system malfunctions. - Compatibility
Compatible with CFC, HFO, FCFC, and HFC refrigerants, as well as various oils, these indicators offer versatility for different system configurations. - Moisture Detection System
A color contrast system provides immediate visual feedback. Green indicates a dry system, while yellow signals moisture, allowing technicians to quickly identify maintenance needs. - Special Order
A replaceable eye option is available by special order, offering added flexibility and extended product life. - Size Range
Available sizes range from ¼” to 7/8” for sweat connections and ¼” to ¾” for flare connections, ensuring compatibility with a wide range of refrigeration systems.
Certifications and Approvals
- UL/cUL 207 Recognized
- Solder ends comply with ANSI B16.18
- Threaded ends comply with UNF standards
Sight Glass Correlation Table
| REFRIGERANT | GREEN/DRY (25°C) | MEDIUM COLOR (25°C) | YELLOW/WET (25°C) | GREEN/DRY (43°C) | MEDIUM COLOR (43°C) | YELLOW/WET (43°C) |
|---|---|---|---|---|---|---|
| R22/R502 | <30 | 30-120 | >120 | <50 | 50-200 | >200 |
| R134A | <30 | 30-100 | >100 | <45 | 45-170 | >170 |
| R404A | <20 | 20-70 | >70 | <25 | 25-100 | >100 |
| R407C | <30 | 30-140 | >140 | <60 | 60-225 | >225 |
| R507 | <15 | 15-60 | >60 | <30 | 30-110 | >110 |
