ZSJ-YM -450 Vane- Type Water Flow Indicator

Description

⚙️ Core Technical Specifications

Parameter	Specification Details
Model Designation	ZSJ-YM-450
Size Range	Available from 2″ to 8″ (NPS 2, 2.5, 3, 4, 5, 6, and 8)
Maximum Working Pressure	450 PSI (31 bar) — engineered for high-pressure systems
Working Temperature	0°C to 49°C (32°F to 120°F)
Compatible Piping	Standard steel pipe specifications Schedule 10 through Schedule 40
Installation Interface	Saddle-mount design (clamps directly over a factory-drilled hole in the pipe)
System Limitations	Suitable strictly for wet pipe sprinkler networks (Do not use in dry or deluge setups)

⏱️ Switch Sensitivity & Pneumatic Retard

To counter sudden pressure changes, water surges, or water hammer effects, the unit incorporates an air delay device:

- Field-Replaceable Retard: Adjustable mechanical delay from 0 to 90 seconds to filter out brief pressure variations and minimize false alarms.
- Flow Activation Range: Designed to actuate an alarm when a sustained flow of 10 GPM (38 L/min) or more passes through the device, while remaining unaffected by brief surges below 4 GPM (15 L/min).

⚡ Electrical Configuration & Material Contacts

- Switch Architecture: Dual Single Pole Double Throw (Dual SPDT) switch configuration.
- Switch Contact Loads:
  - - Alternating Current: 8 Amps @ 125 / 250 VAC
    - Direct Current: 3 Amps @ 24 VDC / 2.5 Amps @ 30 VDC
- Enclosure / Cover: Corrosion-resistant outer safety cover painted fire-protection red.

📜 Standards & Approvals

- Safety Certifications: Dual certified UL Listed and FM Approved for permanent fire-protection configuration services.
- Design Standards: Built and evaluated strictly in accordance with UL 346 (Standard for Waterflow Indicators for Fire Protective Signaling Systems) and FM Class 1042 standards.