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| Airflow Sensors - LS Series and FS Series |
 Self-contained Sensor/Switch Provides Alarm or System Shutdown on Loss of Cooling System Airflow.
- Available for varied voltage sources
- Built-in time delay interval ignores transient airflow interruptions
- Ambient compensated design provides stable performance under wide ambient
- Rugged design meets MIL shock/vibration/ambient requirements
- No additional circuitry required
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| LS Series - Military applications |
Description
LS Airflow Sensors are cooling effect monitors that provide a positive indication of the presence of airflow. Independent of the air temperature, these units are used to operate an alarm or shutdown device when airflow drops below a preset level.
Advantages
- Small size meets MIL Shock/Vibration/Ambient requirements
- Operates down to -55°C if continually energized
- High reliability/enhance4d MTBF rate
- Self-contained Sensor/Switch, no additional circuitry required
- Built-in time delay ignores transient airflow losses
Applications
- Computer/peripheral systems
- Shipboard ventilation/exhaust systems
- Fire control systems
- MIL communications systems
- MIL Radar systems
- Weapons systems
Operations
LS Airflow Sensors utilize a differential expansion principle in which the air entering the inlet circulates and cools an electrically heated internal element. Varied voltage source designs available. When the airflow drops below the nominal setting, the temperature of the heated element rises quickly, causing the operation of a contact (either N.O. or N.C.). This inherent thermal delay avoids contact operation on brief interruptions of airflow. On restoration of airflow, the sensor will automatically reset after a brief cooling period.
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| Specifications
View LS - Series Markup Drawing
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| Heater Voltage: |
5 V., 12 V., 28 V., or 115 VAC/DC
Other voltages available |
| Input Power: |
4 Watts, nominal |
| Contact Rating: |
2 A. resistive up to 115 VAC
1 A. resistive up to 32 VDC |
| Usable Voltage Range: |
±10% of nominal, see voltage Variation chart |
| Setting: |
(see table) |
| Response Time: |
1 to 20 seconds (depending on setting and air velocity prior to stoppage) |
| Temperature Range: |
-55°C to 85°C, energized |
| Vibration: |
10 g to 500 Hz. |
| Shock: |
50 g for 11 msec |
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LS Series Ordering Information |
Ordering Information
Refer to Table and Specify Model
Air Flow (*)
(Linear Feet Per Minute) |
| Heater Voltage AC/DC |
Contact Configuration S.P.S.T. (#) |
250 F.P.M. |
500 F.P.M. |
750 F.P.M. |
| 5V. |
N.O. |
LS-6025 |
LS-6027 |
LS-6029 |
| 5V. |
N.C. |
LS-6052 |
LS-6054 |
LS-6056 |
| 12V. |
N.O. |
LS-6031 |
LS-6033 |
LS-6035 |
| 12V. |
N.C. |
LS-6058 |
LS-6060 |
LS-6062 |
| 28V. |
N.O. |
LS-5053 |
LS-5011 |
LS-5057 |
| 28V. |
N.C. |
LS-5054 |
LS-5022 |
LS-5058 |
| 115V. |
N.O. |
LS-5055 |
LS-5001 |
LS-5059 |
| 115V. |
N.C. |
LS-5058 |
LS-5016 |
LS-5060 |
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| (*) Nominal Factory Setting. Tolerance ± 100 Ft./Min. at Rated Voltage
(#) N.O.: Contacts close on loss of air flow.
N.C.: Contacts open on loss of air flow. |
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| FS Series - Commercial/Industrial Applications |
Description
FS Airflow Sensors are cooling effect monitors that provide a positive indication of the presence of airflow. Independent of the air temperature, these units are used to operate an alarm or shutdown device when airflow drops below a preset level.
Advantages
- Low Price
- Self-contained Sensor/Switch, no additional circuitry required
- Non sensitive to air temperature
- Sturdy construction
- Plug-in mounting, sockets and mounting assemblies available from manufacturer
- Minimum interface with airflow
Operations
FS Airflow Sensors utilize a differential expansion principle in which the air entering the inlet circulates and cools an electrically heated internal element. Varied voltage source designs available. When the airflow drops below the nominal setting, the temperature of the heated element rises quickly, causing the operation of a contact (either N.O. or N.C.). This inherent thermal delay avoids contact operation on brief interruptions of airflow. On restoration of airflow, the sensor will automatically reset after a brief cooling period.
Mounting
Warren G-V makes sockets (9-pin style) available as well as a mounting-assembly complete with terminal posts for input and alarm leads as illustrated.
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| Specifications
View FS - Series Markup Drawing
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| Heater Voltage: |
5 V., 12 V., 24 V., or 115 VAC/DC
Other voltages available |
| Input Power: |
2.5 Watts, nominal |
| Contact Rating: |
2 A. resistive up to 115 VAC
1 A. resistive up to 32 VDC |
| Usable Voltage Range: |
±10% of nominal |
| Setting: |
(see table) |
| Response Time: |
1 to 20 seconds (depending on setting and air velocity prior to stoppage) |
| Temperature Range: |
0°C to 85°C |
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| FS Series Ordering Information |
Refer to Table and Specify Model
Air Flow (*)(Linear Feet Per Minute) |
Heater Voltage
AC/DC |
Contact Configuration S.P.S.T. (#) |
250 F.P.M. |
500 F.P.M. |
750 F.P.M. |
| 5V. |
N.O. |
FS-1119 |
FS-1117 |
FS-1115 |
| 5V. |
N.C. |
FS-1110 |
FS-1108 |
FS-1106 |
| 12V. |
N.O. |
FS-4111 |
FS-4109 |
FS-4107 |
| 12V. |
N.C. |
FS-4116 |
FS-4114 |
FS-4112 |
| 24V. |
N.O. |
FS-2101 |
FS-2131 |
FS-2133 |
| 24V. |
N.C. |
FS-2102 |
FS-2132 |
FS-2134 |
| 115V |
N.O. |
FS-3101 |
FS-3131 |
FS-3133 |
| 115V |
N.C. |
FS-3102 |
FS-3132 |
FS-3134 |
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| * Nominal Factory Setting: Tolerance ± 100 Ft./Min.(Consult factory for thresholds below 150 Ft./Min.
** N.O.: Contacts close on loss of air flow.
N.C.: Contacts open on loss of air flow.
Sockets Available: PN: 4-1-250 Socket/Terminal Assembly A1003 Socket Only |
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