Datasheet| Technical Data | |
|---|---|
| Pressure Connection | External thread G 1/2 (manometer connection), G 1/4 internal according to DIN 16 288. |
| Switch Housing | 300 Aluminum die-cast GD Al Si 12. |
| Installation Position | Vertical with switchgear facing upwards |
| Protection Class | IP 65 |
| Ex-Protection Class | Ex-i (only in conjunction with isolation switchgear). |
| Pressure Sensor Materials | Housing: 1.4104, Pressure bellows: 1.4571. All parts completely welded. Safety membrane (not in contact with medium) made of Perbunan. |
| Ambient Temperature | –25 °C to +60 °C. If the ambient temperature is below 0°C, it must be ensured that no condensation forms in the sensor and switchgear. |
| Max. Medium Temperature | +60 °C. |
| Outdoor Installations | Protect the device from direct weather influences. Provide suitable protective cover! |
| Max. Permissible Operating Pressure | 40 bar. |
| Switching Pressure | 3–16 bar. Adjustable via the setting spindle after removing the terminal box. |
| Adjustment | The FD16-316 and FD16-327 series are factory-set for rising pressure. This means the adjustable switching pressure on the scale corresponds to the switch point at rising pressure, and the reset point is lower by the switching differential. (See also p. 23, 2. Adjustment at the upper switch point.) |
| Locking After Shutdown | Internal locking for FD 16–327. Unlocking: After reducing the pressure by approx. 2.5 bar by pressing the red button (with tool) on the scale side of the pressure switch. External locking for FD 16–326. Unlocking: After reducing the pressure by approx. 0.5 bar. Press the release button in the control cabinet. |
| Wire Break and Short Circuit Monitoring | For the FD 16–326 and FD 16–327 types, the control circuit is monitored for short circuits and wire breaks in conjunction with the isolation switch amplifier. The resistor combination built into the pressure switch ensures that a defined current always flows during normal operation. In the event of a short circuit or interruption, the current changes, and the relay switches to the safe side. |
“FD maximum pressure limiters for liquefied gas systems are designed according to the special guidelines for liquefied gas technology. All parts in contact with the medium are made of stainless steel 1.4104 and 1.4571. The pressure sensor is designed to be ‘self-monitoring’, i.e., if the measuring bellows breaks, the pressure sensor switches to the safe side. The pressure sensor thus corresponds to the ‘special design’ in the sense of the Vd TÜV memorandum ‘Pressure 100’. Pressure limiters are used in intrinsically safe control circuits (Ex protection Ex-i). By using an isolation switch amplifier, the control circuit is also monitored for wire breaks and short circuits. It is supplied with a switch housing made of aluminum die-cast GD Al Si 12. The switching pressure (3-16 bar) can be adjusted using the adjustment spindle after removing the terminal box. Explosion protection Ex-i types (only in conjunction with an isolation switch amplifier). Note: FD pressure limiters must never be connected directly to the mains voltage. They may only be used in conjunction with an isolation switch amplifier. Locking after shutdown: Internal locking for FD16-327. Release of the lock: after a pressure drop of approx. 2.5 bar by pressing the red button (with tool) on the scale side of the pressure switch. External locking for FD16-326. Release of the lock: After a pressure reduction of approx. 0.5 bar. Press the release button in the control cabinet. Features and Benefits: -Wire break and short circuit monitoring -For the FD16-326 and FD16-327 types, the control circuit is monitored for short circuits and wire breaks in conjunction with the isolation switch amplifier. -The resistor combination built into the pressure switch ensures that a defined current always flows during normal operation. -In the event of a short circuit or wire break, the current changes, and the relay drops to the safe side. Certifications: -ID 0000033127 according to Vd TÜV leaflet Pressure 100/1, edition 07.2006 and DIN EN 12952-11, edition 09.2007 and DIN EN 12953-9, edition 09.2007-01 202 931-B-11-0002 according to Directive 97/23/EC-SIL2 according to IEC 61508-2”