EA402 913-402-000-013-A1-E050-F0-G000

Product Overview

Model 913-402-000-013-A1-E050-F0-G000

913-402-000    EA402 extension cable base model.

-013               Intrinsically Safe, Exi, suitable for explosive hazardous areas.

-A1                 Not explicitly stated in the manual, but usually "A1" may refer to a specific connector or certification variant, which can be regarded as part of the Exi version in this context.

-E050             The cable length is 5.0 meters.

-F0                 No stainless steel braided sheath

-G000             No BOA protection

Product functional features

Precise Distributed Parameter Transmission Line

The characteristic impedance of a cable is jointly determined by the diameter of its central conductor, the dielectric constant of the insulation layer, and the structure of the shielding layer. EA402 is precisely manufactured to maintain a tolerance of 70Ω ± 1Ω. This value is not chosen randomly but, together with the coil inductance of the TQ probe and the oscillation circuit of the IQS 452 preamplifier, forms an LC resonant circuit with a resonant frequency of approximately 1MHz. Any impedance deviation will change the Q value and resonant point of the circuit, directly affecting the sensitivity and linearity of the system.

The distributed capacitance is low and stable, and the distributed capacitance per meter of the cable is strictly controlled. The total capacitance of the entire measurement chain is a fixed design value. The calibration of the preamplifier is precisely based on this total capacitance. If the wrong length or model of cable is used, the total capacitance will change, which will lead to:

Sensitivity drift occurs when the proportional relationship between the output voltage and the actual displacement changes.

Linear range offset, where the effective linear measurement zone moves, may result in exceeding the linear zone even at the normal operating position.

The temperature stability deteriorates, and the rate of change of cable capacitance with temperature will affect the temperature drift performance of the entire system.

Outstanding signal fidelity, 913-402-000-013-A1-E050-F0-G000 serves as a bridge connecting the probe and the preamplifier. The EA402 must ensure that the signal has the minimum amplitude attenuation, the lowest phase distortion, and the least noise introduction during transmission. Its high-quality foamed FEP insulation and double-layer braided shielding jointly achieve this goal, ensuring the accuracy of sub-micron vibration and displacement measurements.

Intrinsically safe system-level security mechanisms

The EA402 Exi cable itself does not "generate" safety as a key link in the energy-limiting circuit, but is a component of the entire intrinsically safe circuit. The 913-402-000-013-A1-E050-F0-G000 must work in conjunction with the IQS 452 preamplifier. The preamplifier integrates voltage-limiting, current-limiting and isolation circuits internally. These circuits limit the energy from the safety zone to an extremely low level and then deliver it to the TQ probe located in the danger zone through the EA402 cable.

Blue Marker Sleeves are mandatory requirements in standards such as IEC 60079-14. Its existence establishes a clear visual identity of the security boundary. On site, any line marked in blue is regarded as an "intrinsically safe line", which means:

Only certified intrinsically safe tools can be used for operation.

EA402 must not be disconnected or connected when powered on.

913-402-000-013-A1-E050-F0-G000 must be strictly physically isolated from non-intrinsically safe circuits. This standardized color coding is the last line of defense against human error and to ensure life safety.

Even in the worst single failure condition, the energy restricted by the preamplifier is insufficient to ignite a specific explosive gas mixture. The physical structure of the EA402 cable has also been calculated to ensure that it will not become an ignition source due to overcurrent.

For more information about EA402 datasheet, please click on the datasheet below.