This certificate is issued as verification that a sample(s), representative of production, was assessed and tested and found to comply with the IEC Standard list below and that the manufacturer's quality system, relating to the Ex products covered by this certificate, was assessed and found to comply with the IECEx Quality system requirements. This certificate is granted subject to the conditions as set out in IECEx Scheme Rules, IECEx 02 and Operational Documents as amended.
This Unit verification certificate is issued as verification that the Apparatus identified on page 1, was assessed and tested and found to comply with the IEC Standard list below. This certificate is granted subject to the conditions as set out in IECEx Scheme Rules, IECEx 02 and Operational Documents as amended.
The electrical apparatus and any acceptable variations to it specified in the schedule of this certificate and the identified documents, was found to comply with the following standards:
As this is a Unit Verification Certificate, no QAR is applicable as this certificate is specific to the items listed by serial number or other unique identification.
There three types of viscometer, the XL7 (aka ‘Viscojet’), the ViscoMelt and the Indie (aka ‘Reactavisc’, ‘Viscolite’ or ‘Go Visc’). All the instruments measure fluid viscosity by electrically sensing the damping, due to the fluid viscosity, experienced by a mechanical, torsionally resonating shaft system, part of which is immersed in the process fluid. Two electromagnets connected to an amplifier module maintain the vibrational resonance of the shaft system.
XL7 Viscometer (aka the ViscoJet) incorporates a microcontroller in the smart head module allowing a bi-directional serial data link to safe area equipment. Frequency measurement is performed within the module. The transducer calibration constants are stored within smart head module, which can calculate viscosity. The smart head module has a platinum resistance thermometer (PRT) input allowing transducers equipped with a PRT to measure temperature. Viscosity, temperature and other parameters can be telemetered to safe area equipment via the serial data link. XL7 transducers can be supplied in a variety of different sizes, with many different process fittings. The only user connection is a 3-wire supply connection, which is by means of a 3-way terminal block inside the enclosure, the cable exiting the enclosure via a gland.