Type ELH101 Precision Sensing Head

The Type ELH101 Precision Sensing Head is a robust weatherproof sensor fitted with a very accurate ELECTROLEVEL tilt transducer. For permanent outdoor installation, the ELH101 can be bolted to the structure to be monitored, and connected to a suitable electronic Signal Conditioning Unit up to 100 metres away
The standard sensor is made from steel with a corrosion-protecting plated finish. For severe environments and specialist applications, the ELH101 can be supplied in Naval Brass, Aluminium Bronze or Stainless Steel.
For applications where a good quality reference surface is not available, the ELH101 may be fitted to an Adjustable Pivot Mounting (Accessory type ELA300). The base of the ELA 300 is mounted on the structure under test, and the ELH101 is set accurately to read zero with precisely adjustable jacking screws. (See Picture)	Type ELH101 Precision Sensing Head fitted to Adjustable Pivot Mounting Type ELA300
The ELH101 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 ELH101 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) AS AN ACCELEROMETER Linear Range Equivalent Pendulum length Undamped Natural Frequency Damping Factor at 25°C PHYSICAL PROPERTIES Datum Stability Long Term Datum Stability Short Term Settling Time to <1%	Value ±5.0 3.0 5.0 1.0 5 0.2 -0.1 3 ±0.1 38 2.5 0.9 15 8 20	Units Degrees % % arc-seconds arc-mins %/°C (max) %/°C (max) arc sec/°C g Units mm Hz arc-sec/month arc sec/hour seconds
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.

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