MODEL VHL
Vibrating Fork Point Level Sensor for Liquids
The Model VHL is a vibrating fork level detection sensor with a relay output, ideal for high, low and intermediate level detection and control of a wide range of liquid and slurry material. This device uses piezoelectric and solidstate electronics technologies, offering a universal AC/DC power supply, a SPDT relay output and a variety of probe lengths. The Model VHL is a liquid level sensor that is economical and very reliable.
Polished vibrating fork is standard
PFA coated or hygienic extreme-polished fork available
Unaffected by dielectric constant, conductivity, viscosity, pressure and temperature
Relay output in compact enclosure
High process temperature of 266°F (130°C)
Short, standard, long and extended probe lengths
IP67 (NEMA 6) rated enclosure
MODEL VHL
Vibrating Fork Point Level Sensor for Liquids
The Model VHL is a vibrating fork level detection sensor with a relay output, ideal for high, low and intermediate level detection and control of a wide range of liquid and slurry material. This device uses piezoelectric and solidstate electronics technologies, offering a universal AC/DC power supply, a SPDT relay output and a variety of probe lengths. The Model VHL is a liquid level sensor that is economical and very reliable.
Polished vibrating fork is standard
PFA coated or hygienic extreme-polished fork available
Unaffected by dielectric constant, conductivity, viscosity, pressure and temperature
Relay output in compact enclosure
High process temperature of 266°F (130°C)
Short, standard, long and extended probe lengths
IP67 (NEMA 6) rated enclosure
Principal of Operation
Model VHL vibrating fork level switches are suitable for level detection of a wide range of liquids. The operation principle is based on an electronic circuit exciting piezoelectric crystals, thereby making the fork probe vibrate. As the fluid or medium reaches and covers the fork its vibration changes, or stops completely. The fork will start vibrating again as the fluid sets it free. The electronics sense the change of vibration and causes the relay contacts to change state.
Application and Use
Mounted on pipes or tanks the filling and emptying of vessels can be controlled using the Model VHL as they can generate fail-safe alarms (on power failure) providing overfill or dry run protection where switching of high current loads is required (refer to technical specifications for relay).
Technical Data
| Power Supply | 20-255VAC, 50/60Hz; 20-60VDC |
| Consumption | AC: 1.2-17VA DC: <3W |
| Enclosure Protection | IP67 (NEMA Type 6) |
| Process Density | ≥ 0.7 S.G. (0.7 g/cm³) |
| Maximum Pressure | 588 psi (40 bar) |
| Maximum Viscosity | 10,000 cSt (mm2/s) |
| Medium Temperature | -40°F to +266°F (-40°C to +130°C) |
| Ambient Temperature | -22°F to +158°F (-30°C to +70°C) |
| Local Indication | Bi-Color LED Alarm – Red. Normal – Green |
| Output | SPDT Relay, 8A @ 250VAC |
| Probe Material | 316Ti Stainless Steel (DIN 1.4571) |
| Housing Material | PBT Fiber-Reinforced, Flame Retardant, Painted |
| Certifications | CE mark |
More Information
Click here to download product line PDF’s
Standard Sensor Model Includes
- Short Probe (2.7″/69mm long)
- Standard Probe (4.9″/125mm long)
- Long Probe (7.9″/200mm long)
- Extended Probe (12″-118″/300mm-3,000mm)
- Ordinary Locations
Principal of Operation
Model VHL vibrating fork level switches are suitable for level detection of a wide range of liquids. The operation principle is based on an electronic circuit exciting piezoelectric crystals, thereby making the fork probe vibrate. As the fluid or medium reaches and covers the fork its vibration changes, or stops completely. The fork will start vibrating again as the fluid sets it free. The electronics sense the change of vibration and causes the relay contacts to change state.
Application and Use
Mounted on pipes or tanks the filling and emptying of vessels can be controlled using the Model VHL as they can generate fail-safe alarms (on power failure) providing overfill or dry run protection where switching of high current loads is required (refer to technical specifications for relay).
Technical Data
| Power Supply | 20-255VAC, 50/60Hz; 20-60VDC |
| Consumption | AC: 1.2-17VA DC: <3W |
| Enclosure Protection | IP67 (NEMA Type 6) |
| Process Density | ≥ 0.7 S.G. (0.7 g/cm³) |
| Maximum Pressure | 588 psi (40 bar) |
| Maximum Viscosity | 10,000 cSt (mm2/s) |
| Medium Temperature | -40°F to +266°F (-40°C to +130°C) |
| Ambient Temperature | -22°F to +158°F (-30°C to +70°C) |
| Local Indication | Bi-Color LED Alarm – Red. Normal – Green |
| Output | SPDT Relay, 8A @ 250VAC |
| Probe Material | 316Ti Stainless Steel (DIN 1.4571) |
| Housing Material | PBT Fiber-Reinforced, Flame Retardant, Painted |
| Certifications | CE mark |
More Information
Click here to download product line PDF’s
Standard Sensor Model Includes
- Short Probe (2.7″/69mm long)
- Standard Probe (4.9″/125mm long)
- Long Probe (7.9″/200mm long)
- Extended Probe (12″-118″/300mm-3,000mm)
- Ordinary Locations
Ordering Information
Sensor Final Assembly Part Number Structure
Ordering Information
Sensor Final Assembly Part Number Structure
1 – 2.7″ (69mm)
2 – 4.9″ (125mm)
3 – 7.9″ (200mm)
4 – Extended (12″ – 118″)
1 – 1″ NPT
1 – 2.7″ (69mm)
2 – 4.9″ (125mm)
3 – 7.9″ (200mm)
4 – Extended (12″ – 118″)
1 – 1″ NPT