The FTEX series flow switch is the most reliable flow switch available. The thermal dispersion principle of operation features no moving parts and provides an extremely
reliable and repeatable switch for the most demanding industrial applications.
The sensor head employs two temperature sensors with a constant very low power heating source physically attached to one of the temperature sensors. The second temperature sensor is isolated from the heating source and provides compensation for changing process temperatures (see fi gure 1). As flow changes so does the
temperature differential. This allows the device to be used as a flow/no fl ow sensor and to be used to switch at any velocity shown in the flow switch range chart.Extremely low flow rates can be detected with rangeability up to 300:1. These devices are ideal for use in virtually all liquids, gases, and slurries. With no moving parts exposed to the process end users are provided an extremely reliable and repeatable instrument even in viscous or corrosive applications.
The electronics are available with single or dual switch points. Temperature monitoring is also available with either a switch output or a linear 4-20 mA output.
Relay outputs are standard and are offered with several different confi gurations and contact ratings. Remote mounting of the electronics is also available.
Specifications
Sensor Head
Material of Construction: 316L Stainless Steel Standard, Optional Exotic Alloys
Operating Temperature: -50 to 350F (-46 to 177C) Standard,Option -100 to 900F (-73 to 482C),Option -320 to 500F (-196 to 260C)
Operating Pressure: Vacuum to 4000 PSIG (275 Bar),Option to10,000 PSIG ( 689 Bar)
Response Time: From 3 Seconds
Repeatability : +/- 0.5% of Range at Constant Conditions
Process Connection: 3/4” MNPT, 1” MNPT, Option Flanged, Retractable Probes,and 1-1/4”, 1-1/2”, 2”, 3”, 4” MNPT
Probe Length: 1.8”, 1.2”; Option Customer Specified
Electronics
Housing: Powder Coated Explosion Proof, UL/CSARatedtoClass1,Div.1&2, Group B,C,D; Class II, Div. 1 & 2, Group E,F,G; Class III. FM Option
Temperature: -50 to 150F (-46 to 65C)
Power Input: 90-135 VAC, 50/60 Hz, 4 Watts,Option 24 VDC/VAC, 200-240VAC
Relay Output: SPDT 3 Amps Resistive
Option DPDT and 10Amps Res
Electrical
Connection: 1” FNPT
Weight: 5 lbs
Pump Related Applications
• Low Flow Shutoff of Pumps
• Seal Water Leakage Detection
• Bearing Lubrication Monitor
• Cavitation Alarm
• Chemical Feeder Pump Sensor General Applications
• Flow Indication/Verification
• HVAC Flow Sensor
• Tank Car Unloading
• Agitation Monitor in Tanks
• Rupture Disc/ Relief Valve Flow Monitor