Product Overview

SITRANS LVS200 is a vibrating point level switch designed for high, low, or demand level detection of bulk solids. It is available in standard and liquid/solid interface versions, with an optional low-density configuration.

Benefits

• High resistance to mechanical forces.
• Strong vibration resistance to high bulk material loads.
• Rotatable enclosure for convenient wiring.
• Suitable for low density material: standard version, 20 g/l (1.3 lb/ft³); liquid/solid interface version, 50 g/l (3 lb/ft³) and low density option min. 5 g/l (0.3 lb/ft³).
• Customer desired extensions up to 20 000 mm (787 inch).
• Optional detection of solids within liquid (interface version).
• Durable short fork option with 165 mm (6.5 inch) insertion length.

Application

The standard LVS200 detects high, low, or demand levels of dry bulk solids in bins, silos, or hoppers. The liquid/solid interface version can also detect settled solids within liquids or solids within confined spaces such as feed pipes. It is designed to ignore liquids in order to detect the interface between a solid and a liquid.

A pipe extension version is available with either the standard or liquid/solid interface electronics and fork, separated by a customer supplied 1 inch pipe.

SITRANS LVS200 has an optional 4 to 20 mA output for monitoring build-up on the fork to determine when preventative maintenance should be performed in sticky applications.

The LVS200 has a compact design and can be top, side, or angle mounted. The vibrating fork design ensures the tines are kept clean. The unique design of the fork and crystal assembly eliminates false high level readings even if tines become damaged.

A signal from the electronic circuit excites a crystal in the probe causing the fork to vibrate. If the fork is covered by material, the change in vibration is detected by the electronic circuitry which causes the relay to change state after a one second delay. When the fork is free from material pressure, full vibration resumes and the relay reverts to its normal condition.

Key Applications: dry bulk solids in bins, silos, hoppers or settled solids within liquids (interface version).

Technical Specifications

Specification	Value
Mode of operation - Measuring principle	Vibrating point level switch
Input - Measured variable	High, low, and demand
Measuring frequency - Standard	125 Hz
Measuring frequency - Liquid/solid interface and short fork version	350 Hz
Output - PNP	Open collector: Permanent load max. 0.4 A, short-circuit and overload protected Turn-on voltage: max. 50 V (reverse protection)
Output - 2-wire without contact	Load current: Min. 10 mA Max. 500 mA permanent Max. 2A < 200 ms Max. 5A < 50 ms Voltage drop on the electronic module: max. 7 V with closed electric circuit Cut-off current with open electric circuit: max. 5 mA
Output - Relays - Version with 1 relay	SPDT relay
Output - Relays - Version with 2 relays	DPDT relay
Output - Relay delay	From loss of vibration: approximately 1 second From resumption of vibration: approximately 1 ... 2 seconds
Output - Signal delay	Probe uncovered to covered: approximately 1 second Probe covered to uncovered: approximately 1 ... 2 seconds
Output - Relay fail-safe	High or low, switch selectable
Output - Alarm output	Relay 8 A at 250 V AC, non-inductive Relay 5 A at 30 V DC, non-inductive
Output - mA output	8/16 mA or 4 ... 20 mA Resolution: 4 ... 20 mA ± 0.1 mA
Sensitivity	High or low, switch selectable
Rated operating conditions - Location	Indoor/outdoor
Ambient conditions - Ambient temperature	‑40 ... +60 °C (‑40 ... +140 °F)
Ambient conditions - Storage temperature	‑40 ... +80 °C (‑40 ... +176 °F)
Ambient conditions - Installation category	III
Ambient conditions - Pollution degree	2
Medium conditions - Process temperature (All except CSA Class II, Group G)	-40 ... +150 °C (-40 ... +302 °F)
Medium conditions - Process temperature (CSA Class II, Group G)	-40 ... +140 °C (-40 ... +284 °F), CSA temperature code T3B
Medium conditions - Max. threaded bushing temperature	80 °C (176 °F)
Medium conditions - Max. enclosure surface temperature (Category 2D)	90 °C (194 °F)
Medium conditions - Max. extension surface temperature (Category 1D)	150 °C (302 °F)
Medium conditions - Pressure (vessel)	Max. 30 bar g (435 psi g) European Pressure Directive 2014/68/EU: Category 1
Medium conditions - Minimum material density - Standard version	approx. 20 g/l (1.2 lb/ft³)
Medium conditions - Minimum material density - Liquid/solid interface version	approx. 50 g/l (3 lb/ft³)
Medium conditions - Minimum material density - Optional low density version	approx. 5 g/l (0.3 lb/ft³)
Design - Material - Enclosure	Epoxy coated aluminium
Design - Material - Process connection	Thread 1½" NPT [(Taper), ANSI/ASME B1.20.1], R ½" [(BSPT), EN 10226], and flange options Optional sliding bushing with 2" NPT [(Taper), ANSI/ASME B1.20.1] or BSP thread Thread material: stainless steel 303 (1.4301)
Design - Material - Tine material	Stainless steel 316L (1.4404), PTFE-coated tines are available upon special request
Design - Degree of protection	IP65/Type 4/NEMA 4
Design - Conduit entry	2 x M20 x 1.5 or 2 x ½" NPT (For FM and CSA approved versions only.)
Design - Weight - Standard version, no extensions	approx. 2.0 kg (4.4 lb)
Design - Weight - Solids/liquids version, no extensions	approx. 1.9 kg (4.2 lb)
Power supply	19 ... 230 V AC, +10 %, 50 ... 60 Hz, 8 VA 19 ... 55 V DC, +10 %, 1.5 W
Certificates and approvals - General Purpose	CSA/FM
Certificates and approvals - CE	Yes
Certificates and approvals - Dust Ignition Proof	CSA/FM
Certificates and approvals - RCM	Yes
Certificates and approvals - ATEX	II 1/2 D
Certificates and approvals - Intrinsically Safe	CSA/FM Class I, II, III Div. 1, Groups A, B, C, D, E, F, G, FM Class I, Aex ia IIC, CSA Class I, Ex ia IIC (available only with power supply options 5 and 6) ATEX II 1G and 1/2 G Eex ia IIC; ATEX II 1D and 1/2 D (available only with power supply option 5)