Approvals

• Coriolis Mass Flow Meters
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• Approvals

The Coriolis gas flow meter is compliant with Underwriters Laboratories Inc. for telemetering equipment used in hazardous locations, including Class I Groups A, B, C, and D; Class II Groups E, F, and G; and Class I Groups C and D, Division 2. The intrinsically safe mass flow sensors are suitable for use in hazardous locations of Class I Groups A, B, C, and D, Division 2, as well as Class I Groups C and D; Class II Groups E, F, and G. An optional booster amplifier is available for use in Class I, Division 1, Groups C and D; Class I, Division 2, Groups A, B, C, and D; Class II, Division 1, Groups E, F, and G hazardous locations with intrinsically safe circuits.

Furthermore, the transmitter, sensor, and booster amplifier comply with GOST R 51330.1, and their input and output “intrinsically safe” level “ib” also comply with GOST R 51330.10. The Coriolis mass flow controllers with the explosion-proof option “TFM-TFM 1001-Ex” have integral flameproof enclosure protection, complying with GOST R 51330.1, and their input and output “intrinsically safe” level “ib” comply with GOST R 51330.10. Table 1.7 indicates the explosion-proof grade of the sensor.

Table 1.7 – Sensor explosion proof grade

The explosion-proof rating for this transmitter is 1ExdibIICT6X.

Each meter with an explosion-proof modification and its transmitter will have a unique explosion-proof grade assigned to it, which can be found on the corresponding name plates affixed to their bodies.

To ensure proper identification, it is imperative that the nameplate on the ordered Coriolis gas flow meter remains securely affixed and unaltered.

The inclusion of the “Х” letter within the explosion-proof rating denotes specific criteria that must be met.

– The maximum allowable temperature for the measured medium must adhere to the explosion-proof temperature group to avoid potential hazards.

– The provision of explosion protection ensures that the pressure remains below the maximum allowable pressure for a specific modification.

– To ensure the proper functionality of the Coriolis mass flow meter, it is crucial to connect any external circuits to the device through cable entries that comply with GOST R 51330.1 standards.

– To ensure proper functioning and safety, any cable entry not in use must be securely sealed with an appropriate end cap provided by the manufacturer of the Coriolis mass flow meter or with another end cap that is compliant with GOST R 51330.1 standards.

– For compliance with GOST R 51330.1, it is necessary to ensure that the external devices are connected to the pulse, current, and digital outputs of the Coriolis mass flowmeters with “Ex” modification in a unique manner.

To ensure the safety of operating a coriolis mass flow meter in an explosive environment, the “flameproof enclosure” explosion protection method is utilized. This involves enclosing the electrical components of the meter within a housing that complies with the standards outlined in GOST R 51330.1. This enclosure effectively contains any potential explosion within the meter, preventing it from escaping into the surrounding hazardous area.

The enclosure’s explosion protection is guaranteed by employing the subsequent methods:

– The housing design has been tested and proven to withstand high-pressure explosions, withstanding pressures up to four times the expected explosion pressure.

– The compliance with GOST R 51330.1 requirements for axial thread length and the number of complete turns for thread engagement is mandatory.

– The requirements for the gaps and lengths of flameproof joints, whether flat or cylindrical, must adhere to the guidelines set forth in GOST R 51330.1 to ensure their uniqueness and safety.

– It is important to ensure that the surface temperature of the maximum Coriolis flow meter does not surpass the temperature range specified by GOST R 51330.0 for the relevant temperature groups in order to maintain proper working conditions.

– Т4 for the coriolis flow controllers with temperature modification code «100»;

– Т3 for the coriolis flow controllers with temperature modification code «200»;

– Т1 for the coriolis mass flow meters with temperature modification code «350».

The intrinsic safety of input and output circuits at the “IB” level for explosion protection is guaranteed through the implementation of the following measures:

– To ensure proper functionality and safety, it is crucial that any external devices connected to the pulse, current, and digital outputs of the Coriolis mass flow controllers of the “Ex” modification are equipped with unique power supplies and connected in compliance with GOST R 51330.1 standards.

• The Coriolis mass flow controller’s anti-spark circuit elements have a unique feature of limiting their electric load to no more than 2/3 of their certified values.

– Ensure that the parameter values of the left/right signal coils, drive coil, and temperature sensor circuits remain within the specified limits outlined by GOST R 51330.10 to maintain compliance.

– To ensure maximum safety, it is recommended that users apply a specialized spark safety barrier equipped with Zener diodes.

– Adhering to the standards outlined in GOST R 51330.10, our electrical clearances and creepage distances are meticulously designed to ensure optimal performance. To guarantee the utmost safety, the insulation resistance between the outer shell of our sensors and the electrical circuit elements can withstand a testing voltage of 500 VAC rms, providing reliable and long-lasting operation.

– The inability of a circuit’s internal capacity and inductance to store energy poses a significant risk for spark ignition gas mixtures classified as IIC, making it a unique safety concern.

– The Coriolis mass flow meter circuit incorporates specialized electronic components and current-carrying elements that are safeguarded against environmental factors through a protective shell. This shell is designed to provide optimal protection with a high degree of resistance to external elements, as specified by the IP 65 standard in compliance with GOST 14254.

– Figure 1.3 presents a block diagram showcasing the Coriolis mass flow meter’s operational principles.

Figure 1.3 – Block diagram of the coriolis flow controller

    The advanced transmitter, sensitive sensor, and efficient booster amplifier fully adhere to the strict standards of GB3836.1-2010, GB3836.2-2010, and GB3864-2010, enabling it to be safely deployed in hazardous locations within Zone 1 and Zone 2. This top-of-the-line equipment boasts an exceptional temperature range of -20℃ to +40℃, making it a reliable choice for various industries. Look out for the unique marking of the product: EX d [ib] IIB+H2 T6 Gb, a testament to its exceptional quality and safety features.

Tables 1.8 and 1.9 display distinct input and output parameters for intrinsically safe circuits.

Table 1.8 – Input parameters of intrinsically safe circuits

Table 1.9 – Output parameters of intrinsically safe circuits

Parameters of the sensor coil windings are shown in Table 1.10.

Table 1.10 – Coil windings parameters

The separate type coriolis gas flow meter can support connection cables up to a maximum length of 300 meters.

The power circuits of the drive coil are effectively isolated from other electrical circuits, as specified in compliance with GOST R 51330.10 regulations. The transformer, which remains undamaged, ensures this isolation. The insulation between the primary and secondary windings is designed to withstand a minimum voltage of 1.5 kV, providing reliable protection against electrical hazards.

Ambient temperature for the coriolis gas flow meters of “Ex” modification must be between -20 and +40 ºC.