Ultrasonic Gap Level Switch for Liquids.

The ECHO Gapswitch Series are a range of ultrasonic gap switches for monitoring and

controlling liquid level.  They provide highly reliable, fixed point liquid level indication with a repeatability of 2 mm or better. All versions are solid state and therefore require no maintenance and provide many years of trouble free operation.

Ultrasonic sound waves travel from the transmitter to the receiver through the gap.  Air dissipates the sound energy while liquid enhances it.  Thus, when liquid is present, the sound energy easily traverses the gap to the receiver and the control head activates the relay or analog output.

The ECHO Gapswitch Series are offered in a variety of configurations to suit mounting arrangements and a wide variation in liquid viscosity.  Where very arduous conditions exist, units can be supplied in alternative materials of construction such as Teflon, Kynar, Monel or Hastelloy.  High temperature and cryogenic versions are also available.

• No Moving Parts – No Maintenance
• Exotic Materials for Corrosive Materials
• General Purpose & Explosion Proof Versions
• 316L Stainless Steel Standard with ¾” NPT
• Capable of High Temperature & Pressure

GS400 – Low Cost, No Control Head

2-wire (4/20mA = DRY/WET) or 1A SPST Relay

Process Temp: -20° to 160°F (-29° to 71°C)

Pressure Limit: 1,000 psig (69 bar)

GS401 – Mini Switch, No Control Head

2-wire (4/20mA = DRY/WET) or 1A SPST Relay

Process Temp: -20° to 175°F (-29° to 80°C)

Pressure Limit: 250 psig (17.2 bar)

GS402 – Vertical Gap Switch

10 Amp DPDT Relay

Process Temp: -40° to 300°F (-40° to 149°C)

Pressure Limit: 1,000 psig (69 bar)

GS404 – Horizontal Gap Switch

10 Amp DPDT Relay

Process Temp: -40° to 300°F (-40° to 149°C)

Pressure Limit: 1,000 psig (69 bar)

GS405 – HIGH Temperature Gap Switch

10 Amp DPDT Relay

Process Temp: -40° to 550°F (-40° to 288°C)

Pressure Limit: 1,000 psig (69 bar)

GS409 – SludgeSwitch with 6” Vertical Gap

10 Amp DPDT Relay

Process Temp: -40° to 250°F (-40° to 121°C)

Pressure Limit: Consult Factory

Technical Specifications:  GapSwitch 400 Series  

TECHNOLOGY/ OPERATION
Measuring Principle                                        Ultrasonic Gap Level Switch
PERFORMANCE
Repeatability                                                     2 mm or better
Sensitivity                                                           Self-draining liquids only
Power Supply                                                    Version dependent:  110VAC, 230VAC, 12 VDC, 24 VDC, 2-Wire

OUTPUTS
Relay                                                                     Version dependent:   1 DPDT rated 10A @ 120/230VAC, 5A @ 24VDC
Delay                                                                     0.5 seconds
ENVIRONMENT 
Standard Temperature Range                    Process: Version Dependent, Head:  -20˚ to 170˚F (-29˚ to 77˚C)
HIGH Temperature Range (GS405)           Process: -40˚ to 550˚F (-40˚ to 288˚C), Head:  -20˚ to 170˚F
Pressure Limit                                                   Version Dependent, Standard 1000 psig (69 bar)
Outdoor Rating                                                                 NEMA 4X Weatherproof/ EX Version:  NEMA 7

DESIGN 
Standard Insertion Length                           Version dependent , Standard is 2.5 inch
Mounting Arrangement                                                Side or top mounting
Mounting Thread                                             Version dependent, Standard is 3/4 inch
Housing  Material                                             Cast aluminum, epoxy painted enclosure
Wetted Material                                              Standard: 316L Stainless Steel, Optional: PTFE, PVDF, Monel, Hast. C
Weight                                                                 Version Dependent:  Approx. 1 lb (0.5 kg)

APPROVALS
Standard                                                              General Purpose
Hazardous Area                (Optional)                          FM & CSA Approved Class I, II, III; Div 1 & 2, Group C, D, E, F, G

WARRANTY
Product Warranty                                            1 year