High reliability equipment is essential for safety related systems. equipment has reliability designed in, and together with its highly sophisticated diagnostic routines offers very high availability figures.
systems are used by major North Sea operators for remote emergency shutdown systems, (ESD), on:
unmanned production platforms
floating production units
tanker loading facilities
High reliability systems are available as single or dual redundant units based on System 3 modular data telemetry equipment. System 3HR equipment features:
high reliability ceramic or Milspec components
de-rated component application
circuit and system temperature
Duplicated telemetry channels run in a master/hot standby mode.
Each channel continuously monitors the other channel processor and telemetry functions.
An arbiter makes decisions on channel operation and switches channels on output signals accordingly.
Various levels of dual redundancy are possible.
Totally duplicated end to end links including i/o sensors and actuators
Duplicated processors with dual dedicated telemetry channels
Single processors with multiple communication paths, land line, radio or fibre optic line
Using the radio/modem card the masterstation communicates with outstation at data rates up to 9600 baud. The communication protocol is designed to give a very high error detection rate, combined with efficient serial data transfer protocols.
A masterstation can control multiple outstations using radio polling telemetry. To further increase transmission security, techniques using spatially diverse antennas and repeater stations can be used. Radio telemetry is available for VHF, UHF or microwave, dependant on the channel requirements and inner-site distances.
Serial outputs to distributed control systems.
The masterstation interfaces to Distributed Control Systems (DCS) using standard gateways running MODBUS or similar protocol.
Local parallel digital and analogue outputs are available for local ESD panels
master station SCADA work stations provide stand alone ESD control and monitoring using IBM or Digital terminals
HART and Fieldbus serially connected pressure and temperature transmitters interface directly with outstations allowing
reprogramming of parameters for the control room.
Unlimited parallel input/output is available using System 3HR modular i/o cards.
Command Outputs (with status feed back)
Outstations with EEx(ib) approval are available for Zone 1 hazardous areas or Ex(N) suitable for Zone 2 hazardous areas. In both cases, integral radios are included in the certification.
's System 3HR is designed for low power consumption and outstations can successfully
operate on solar or wind power if required.
Systems may be supplied with dual redundant power units or battery backed power.
Digital input 32 channels per card
Digital output 32 channels per card
Command output 32 channels per card
Analogue input 16 channels per card
Analogue output 16 channels per card
Pulse count 16 channels per card
Universal interface card
Thermocouple input 8 channels per card
RS 485 serial lines
Full or half duplex
1200 to 9600 baud
UHF radio option
Land line driver
Fibre optic driver
12/24V DC or 110/220V AC
Low power consumption circuitry
IP66 rugged enclosure
IP65 portable enclosure (includes H2S filters)
IP42 rack mounted chassis
Ex(N) II T6
EEx (ib) T4 (LINK!!!!)