Product Details
What is the Liquiphant FTL31
- The Liquiphant FTL31 is a point level switch designed for detecting liquid level (or the presence/absence of
liquid) at a specific point (as opposed to continuous level
measurement).
- It uses the vibronic / tuning fork principle: a fork vibrates at a given resonance frequency; when the fork is
immersed in a liquid, that resonance frequency shifts, which is
detected by the electronics.
Key Technical Specifications
Here are some of its main specs & capabilities:
Spec | Value / Range |
Process temperature | −40 °C to +150 °C |
Process pressure | Vacuum up to +40 bar (≈ 580 psi) |
Minimum density of medium | Standard >0.7 g/cm³; optionally >0.5 g/cm³ |
Wetted materials | Stainless steel 316L (for all parts in contact with process liquid) |
Process connections | Various threaded connections: G½, G¾, G1, NPT etc. |
Electrical / Output options | 3-wire DC-PNP (10-30 V DC), or 2-wire AC/DC (20-253 V) |
Communication / Features | Some versions have IO-Link; continuous self-monitoring; LED
indicators; plug-and-play, no calibration needed. |
Applications / Use Cases
- Overfill protection: to detect when liquid reaches a certain high
level to prevent spillovers.
- Dry-run protection: detecting when a pump’s liquid level drops too
low.
- Lower level detection: as a safety / control switch in tanks,
vessels, pipes.
- Industrial machinery, cleaning systems, anywhere a simple reliable
point-level detection is needed.
Key Advantages
- Reliability & Safety: It has built-in continuous self-monitoring, meaning if power is
lost or there's a fault, the sensor gives a safe (fail) signal.
- Insensitive to many disturbances: Turbulence, flows, air bubbles, conductivity, foam-build-up or
changing media properties have little to no effect. The
resonance-based tuning fork is fairly robust in these conditions.
- No calibration needed: Reduces setup time and maintenance.
- Compact and rugged design: Stainless steel housing; various mounting and connection options;
high pressure/temperature capability.
- Multiple output / electrical versions: Good flexibility to match with different control systems (DC, AC,
PNP, etc.).
Things to Consider / Limitations
- Minimum density requirement: Standard versions require medium density >0.7 g/cm³. If your
liquid is lighter, you’ll need the optional version (>0.5
g/cm³).
- Not suitable for all hazardous-area use: The FTL31 is not suited for some hazardous area classifications;
for hygienic or especially demanding environments, other models
(e.g. FTL33) might be more appropriate.
- Switching point location depends on installation: Orientation, mounting, distance from walls, etc., can affect the
exact switch point. Proper installation is important (vertical,
horizontal, ensuring fork drains off etc.).
- Response time / hysteresis: There is some delay when the fork is covered vs uncovered, and
hysteresis (difference between on/off switching) to be considered
in tight control loops.
Company Profile
Xi'an Xiyi Central Control Technology Co., Ltd. is an enterprise
engaged in the production, sales and R & D of industrial automation
instruments. The company is located in the ancient city of Xi'an, a
prosperous international city in China.
The company is mainly engaged in Rosemount and Yokogawa pressure
transmitters, differential pressure transmitters, liquid level
transmitters, temperature transmitters, mass flow meters and vortex
flow. Thermocouple, thermal resistance (armored, explosion-proof,
high temperature resistant, corrosion resistant, etc.), pressure
gauge, pressure gauge and bimetal thermometer. And Shanwu avp100 /
avp300 valve positioner, abb valve positioner, Siemens valve
positioner, YT valve positioner, Koso valve positioner, Shanwu
regulating valve and other products. The company has a strong
management team and brings together advanced technical talents at
home and abroad, which will provide you with better service.