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Type ELD204 Dual Channel Rack Mounting Digital Indicator with limit relays

The Type ELD204 dual channel rack mounting digital indicator is a versatile component which can be used to indicate the tilt angles measured by any two of the range of ELECTROLEVEL tilt transducers.
In addition control relays are provided which can be set to change state when the indicated angle exceeds a preset value, thus allowing the control of external equipment such as hydraulic valves, motors et..
The measured angles are displayed on 3 1/2 digit LCD meters
The ELD204 can be powered by its internal universal AC mains adaptor, or use an external unregulated DC power supply from a wide range of sources anywhere in the range 6-28Volts.

ELD204.jpg
Type ELD204 Dual Channel rack mounting Digital Indicator.



This low power consumption unit can be scaled to provide a digital reading representing common standard units e.g
  • arc-seconds
  • decimal degrees
  • millimetres per metre
or custom scaled to user significant units e.g millimetres of deflection over a standard base line.

Voltage output signals are provided which are suitable for driving external meters, data loggers, data acquisition systems and power amplifiers for control systems.

Proprietary circuit techniques match the Signal Conditioning Unit to the attached sensors and minimise the effects of temperature scale drift and temperature datum drift, thus contributing to the high precision of an ELECTROLEVEL system

Where long cables to an external port need to be driven, the ELD204 should be placed within 100 metres of the sensing heads and the optional 4-20mA current loop used to drive the longer cable. (requires 24Volt supply)

The standard Dual Channel rack mounting Digital Indicator is housed in a standard 483 mm 2U rack mounting unit.


Connections to the ELD204 are made with terminal strips at the rear of the unit. Rear panel mounted connectors are available as an option.

The ELD204 is one of a family of Signal Conditioning Units suitable for driving the ELECTROLEVEL tilt transducers. Other units in the range include signal conditioning units, indicators with analogue displays and units which provide digital outputs in a variety of interface specifications.;
For specialist applications, the Signal Conditioning Unit circuits can be supplied for mounting in Standard Rack systems with multi-channel cards and microprocessor control of the data acquisition function




SPECIFICATION ELD204 Dual Channel Digital Indicator with limit relays
Signal Conditioning Unit
Output voltage


Output current


Temperature Coefficient of Scale

Zero drift with temperature

Electronic datum Adjustment Range


Operating Temperature Range to above specification

Overrange Capability

Display


Input Power Consumption

Limit Relays


External Connections

Sensing Head
D.C. supply and External Meter

Sensing head cable length

Power Supply
External DC supply
Universal mains adaptor

Physical Details

Enclosure

Dimensions


± 1 volt d.c. maximum into open circuit with respect to datum reference at 2.5 Volts above system ground.

± 1 mA d.c. into short circuit (short circuit protected).
(4-20mA current loop option)

0.1%/ ° C

100mV/° C

± 0.1 degrees with 0.5 degree Sensing Head
± 1.0 degrees with 5.0 degrees Sensing Head

-15 °C to + 60 °C

will not be damaged by overranged transducer input

3 1/2 Digit LCD meter 11mm digit height.
scaled as required.

50 mA at 12V d.c.

Two pairs changeover contacts rated 250Vac rms, 5A
Separate positive and negative relays for each channel



Terminal Strips
(Optional Rear panel mounted connectors)

100 metres (maximum recommended)


6 to 28 volts d.c.
90/264 Volts ac 47/63 Hz



483 mm rack mounting

482.6 mm W x 88 mm H x 150 mm D

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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2008 Tilt Measurement Limited