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Type ELH104 Submersible
Precision Sensing Head

The Type ELH104 Submersible Precision Sensing Head is a robust submersible sensor fitted with a very accurate ELECTROLEVEL tilt transducer.
For permanent submerged installation, the ELH104 can be bolted to the structure to be monitored, and connected to a suitable electronic Signal Conditioning Unit up to 100 metres away

ELH104.jpg

The standard sensor is made from Aluminium Bronze a corrosion-resistant material suitable for the marine environment.
For severe environments and specialist applications, the ELH104 can be supplied in Naval Brass, or Stainless Steel.


A submersible connector is fitted to the ELH104 allowing the sensing head and its attached cable to be submerged to a depth exceeding 100 metres and giving a long term reliable connection to one of a range of Electronic Signal Conditioning Units above the surface
Type ELH402 Submersible Connector.

The ELH104 is one of a family of sensors which use the ELECTROLEVEL tilt transducer. A curved glass tube holds a conducting fluid and a bubble of gas.
Just like a conventional spirit level, the bubble always settles at the highest point in the tube. Using electrodes built into the tube, the position of the bubble is measured electronically to a very high accuracy. In use , the smallest movement of the sensor will cause the fluid to flow and the output signal to change. the resolution of the sensor is thus effectively infinite, and unlike mechanical sensors, there is no stiction or friction or hysteresis to cause inaccuracy and nothing to wear out.




SPECIFICATION
                             ELH104 Submersible Precision Sensing Head
Parameter

AS A TILT TRANSDUCER

Linear Range (typical)

Linearity Error (max)

Asymmetry Error (max)

Discrimination

Datum Change
for ±5 °Tilt about Cross Axis (max)

Temperature coefficient
with Matched Detector
-10°C to 25°C
+25°C to + 60°C

Datum Temperature Drift (max)

PHYSICAL PROPERTIES

Datum Stability Long Term

Datum Stability Short Term

Settling Time to <1%

Housing

Weight 		Value



±5.0

3.0

5.0

1.0


5




0.2
-0.1

3



15

8

20



1.5 		Units



Degrees

%

%

arc-seconds


arc-mins




%/°C (max)
%/°C (max)

arc sec/°C



arc-sec/month

arc sec/hour

seconds

Aluminium Bronze

Kg

All specifications herein were in effect on the date of this publication. Equipment supplied however,may differ from that specificied due to Tilt Measurement's policy of continual product improvement. The equipment described herein is manufactured in the UK.
  Download Data Sheet as .PDF File (71Kbytes)

ã 2008 Tilt Measurement Limited