Product category:
Signal conditioners, isolators, modems
News Release from: Lee-Dickens | Subject: SIL2 rated products
Edited by the Processingtalk Editorial
Team on 17 January 2007
Lee-Dickens Instrumentation achieves
SIL2 rating
Lee-Dickens announce that their range of high quality trip amplifiers and signal converters have in most cases been assessed and awarded SIL2 rating (with a proof test interval of one year)
Lee-Dickens, the UK instrumentation manufacturer, announce that their range of high quality trip amplifiers and signal converters have in most cases been assessed and awarded SIL2 rating (with a proof test interval of one year) by the independent safety integrity consultant - RM Consultants The continuing drive to improve the performance, reliability and standardisation of safety systems led to the IEC61508 standard `Functional Safety of electrical/ electronic/programmable electronic safety related systems', which defines safety integrity levels (SIL) as measures of the safety of a given process
This article was originally published on Processingtalk on 20 Sep 2007 at 8.00am (UK)
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The Lee-Dickens range including BD100, BD120, BM100, BM120, BD300, BM303, BM916, BD320 and BM320 products feature 'excellent circuit design' that enables them to achieve the SIL2 classification, where some comparable products on the market only manage SIL1.
In addition the Lee-Dickens products are all non processor based, which is especially important to industries such as oil and gas, nuclear power generation and steel.
These same industries are also now demanding that instrumentation being implemented into new installations achieve a rating of at least SIL2 or preferably higher.
Further reading
Multi-channel analogue adder/subtractor
Lee-Dickens are to manufacture a four channel analogue adder/subtractor for like-for-like replacement of products in existing applications.
Isolated frequency to current/voltage converter
The new Lee-Dickens frequency to current/voltage converter has built-in isolation and a universal DC power supply that enables legacy pulse emitting devices to communicate to current or voltage inputs
Signal converters currently on the market largely fail to meet these demands, so the Lee-Dickens range become increasingly desirable especially as they remain price competitive.
The BD100/BM100 are single level trip amplifiers and the BD120/BM120 are dual level trip amplifiers, each from a single process signal input.
The BD300/BM303 are isolating signal converters, which will convert a range of process signals into standard transmission voltage or current signals.
The BD320/BM320 are also isolating signal converters, which convert process signals into two independently isolated current or voltage outputs.
Finally the BM916 is a low input impedance isolating signal converter suitable for conversion of a mA signal into an isolated current or voltage output where minimal input loop resistance is important.
SIL RATINGS.
Safety integrity levels refer specifically to the probability of failure on demand (PFD) - or to what extent the end user can expect his process to perform safely, and in the case of failure, fail in a safe manner.
By selecting devices that are rated for use within a desired SIL environment, end users can optimise their processes for risk.
The advantage for end users selecting a product with a SIL rating and accompanying assessment summary is that reliability calculations are already performed and available to the end user.
The user also has the security of knowing that a third party has reviewed the reliability statistics for the product, and most importantly the attached certification report that accompanies each product contains important information ranging from restrictions of use to diagnostics within the device and also reliability statistics. Request a free brochure from Lee-Dickens ...
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