Tamper Switch Dan Flow Switch
FeaturesOrange Research instruments are available with switches and relays to allow the user to be alerted of process conditions,or control process equipment at pre-set values. We offer SPST, normally open or normally closed, and SPDT switches.Our flow switches are hermetically sealed reed switches and come with or without enclosures, depending on the flow switch model.The models with enclosures have all of the common safety ratings to satisfy a variety of environments and markets. Select from Nema-4X toClass 1, Division 1 or 2, or UL, CSA, CE, or ATEX ratings, just to name a few. For complete safety ratings or certifications refer to ourindividual model Specifications Sheets.Most of our reed switches are field adjustable within the upper 70 or 80% of the full-scale range of the instrument,depending on the model. Refer to our Specification Sheets for details on each model. All flow switches are preset to full-scalerange unless another value is specified at the time of order placement.
When two switches are used they can be set independentof each other.Our relays are best for high inductive circuits such as those incorporating solenoids or motors. We use a reed switch to actuatethe relay at a prescribed value. This isolates the reed switch, protecting if from high current or voltages. Some flow switch modelsallow for two relays on one instrument.Many customers select a with a switch or a,which allows for remote readout and alerts.
Specifications CodeNumber of Switches.ElementsSwitch Ratings(for DC ratings see individual specification sheets)Availability- A- A-A12SPSTSPSTN.O., 125 VAC, 0.7 AN.O., 125 VAC, 0.7 AAll modelsAll but 1201PS, PGS, 1502DS, DGS- B- B-B12SPSTSPSTN.C., 120 VAC, 0.2 AN.C., 120 VAC, 0.2 AAll modelsAll but 1201PS, PGS, 1502DS, DGS- C- C-C12SPDTSPDTC form, 120 VAC, 0.2 AC form, 120 VAC, 0.2 AAll modelsAll but 1201PS, PGS, 1502DS, DGS- R2RelayDPDT10 A contacts, 115 VAC coil (standard)All but 1201PS, PGS, 1502DS, DGS 1831DS, DGS. Orange Research instruments use long life, hermetically sealed reed switches. Depending on the load, reed switches can be expected to provide between 1-5 million operations at 240 VAC/50 W and 5-10 million operations at 110 VAC/50 W.To provide maximum life it is recommended that the proper contact protection be applied to reduce or eliminate arcing when switching inductive loads.
For example, AC circuits could use a 100 ohm 1/4 W resistor and 0.1 μf, 600 V capacitor in seriesacross the contacts. For DC circuits use a 1N4004 diode (or equivalent) that is connected cathode-to-positive across the inductive load.Refer to our Instruction Sheets for schematics on our differential pressure and flow switches, relays and electronics.
Wet system (fire sprinkler lines) is constantly filled with water as opposed to a dry system such as a pre-action system (we will talk about these later). The water in the sprinkler line is monitored by a pressure gauge usually located near the main fire riser and waterflow switch.Also you will find a tamper switch located in strategic places as to separate the system into different sections as needed for maintenance and or emergencies. These will be typically located on each level of a facility. There are sure to be additional locations but it stickily depends on the layout of the facility and sprinkler system. Once a sprinkler head reaches its destruction point it pops and opens up the valve attached the the fire sprinkler system.
Now that the stored water has a place to escape it pours out with extreme pressure to suppress the fire. While this water is pouring out, it needs to be replaced. With the water pressure coming into the sprinkler system the water is replaced one for one. Once this cycle starts, the flapper behind the water flow switch is activated just like a light switch.
As required by NFPA 72 the Water Flow switch shall initiate an alarm within 90 seconds. This adjustment can be achieved by tuning a small dial on the water flow device itself. In case you are wondering, the 90 second delay is to help prevent nuisance alarms from leaks, water surges, city back pressure, etc. Also located on the water flow switch is two sets of dry contacts.
Tamper Switch Dan Flow Switch Diagram
One of these sets will be used for the 120VAC switch leg to the sprinkler bell and the other is to be used for the connection to the fire alarm control panel for the purpose of alerting the occupants and central station dispatch. This is a very simple explanation of how a wet fire sprinkler system works. Let me know if you would like more details. It is also nice to note that the movies always have it wrong. They seem to think that if one sprinkler head bursts that they all go. Nothing could be further from the truth.Make sure to join our Fire Alarms Online Facebook Group.