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Velomitor® 350900 High-Temperature Velocity and Acceleration Sensor (HTVAS)

Velomitor - High-Temperature Velocity and Acceleration Sensor (HTAS)

Designed for use on a wide variety of gas turbines, the 350900 separates the high-temperature-rated sensing element from the signal conditioning electronics, with the two permanently connected via a flexible, mineral-insulated, hard-line cable. This robust arrangement allows mounting of the sensing head in areas with temperatures as high as 482° C (900° F).

 

 

 

 

 

 

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Specifications are between +20 °C and +30 °C (+68 °F to +86 °F) with machine casing vibration at 100 Hz (6000 cpm) and with a 10 kW load unless otherwise indicated.

Electrical

Power Requirements

Input Voltage -18 to -30 Vdc; -18 to –28 Vdc for hazardous area approval options.
Quiescent Current 6 mA nominal, no load.
Transverse Sensitivity Less than 5% of axial sensitivity.
Amplitude Linearity ± 1% to 4900 m/s2 (500 g) peak overall acceleration.
Mounted Resonant Frequency Greater than 15 kHz.
Maximum Cable Length 305 metres (1000 ft).
Grounding Case isolated.

Velocity Output

Sensitivity 3.94 mV/mm/s (100 mV/in/s) ±5%.
Frequency Response 40 Hz to 1 kHz (2400 cpm to 60 kcpm) ±5% with 305 metres (1000 ft) of cable.
25 Hz to 2 kHz (1500 cpm to 120 kcpm) ±3 dB with 305 metres (1000 ft) of cable.
System Sensitivity over Extended Temperatures Over a sensor temperature range of –54 °C to +399 °C (-65 °F to +750 °F) and with the electronics between –54 °C to +125 °C (-65 °F to +257 °F), the output remains within ± 10% of 3.94 mV/mm/s (100 mV/in/s).
Over a sensor temperature range of –54 °C to +482 °C (-65 °F to +900 °F) and with the electronics between –54 °C to +125 °C (-65 °F to +257 °F), the output remains within ± 15% of 3.94 mV/mm/s (100 mV/in/s).
Output Bias Voltage -10.0 ± 2.0 Vdc.
Velocity Range 1270 mm/s (50 in/s).
Broadband Noise Floor (5 Hz to 2 kHz) 0.05 mm/s rms (0.002 in/s rms), max.

Acceleration Output

Sensitivity 1.02 mV/m/s2 (10 mV/g) ± 5%.
Frequency Response 25 Hz to 4 kHz (1500 cpm to 240 kcpm) ± 5% with 305 metres (1000 ft) of cable.
10 Hz to 10 kHz (600 cpm to 600 kcpm) ± 3 dB with 305 metres (1000 ft) of cable.
System Sensitivity over Extended Temperatures Over a sensor temperature range of -54 °C to +399 °C (-65 °F to +750 °F) and with the electronics between –54 °C to +125 °C (-65 °F to +257°F), the output remains within ± 10% of 1.02 mV/m/s2 (10 mV/g).
Over a sensor temperature range of –54 °C to +482 °C (-65 °F to +900 °F) and with the electronics between –54 °C to +125 °C (-65 °F to +257 °F), the output remains within ± 15% of 1.02 mV/m/s2 (10 mV/g).
Output Bias Voltage -10.0 ± 2.0 Vdc.
Acceleration Range 4900 m/s2 (500 g).
Broadband Noise Floor (5 Hz to 2 kHz) 147 mm/s2 (1.5 mg) rms, max.

Hazardous Area Classification

Multiple approvals for hazardous areas certified by Canadian Standards Association (CSA/NRTL/C) in North America and by LCIE/CENELEC in Europe.

North America Ex ia/AEx ia for Class I Zone 0 IIC T4C @ Ta = 100ºC or Class I, Division 1, Groups A, B, C, and D; Class II, Division 1, Groups E, F, and G; and Class III, Division 1, when installed with an approved zener barrier per BN drawing 168077.
Ex nL/AEx nL IIC Class 1, Zone 2 Class I, Division 2 (non-incendive), Groups A, B, C, and D when installed per BN drawing 168077.
Europe/CENELEC Ex II 1 G
EEx ia IIC T4
LCIE 04ATEX6140X
T4 @ Ta = -40ºC - 100ºC
Ex II 3 G
EEx nA II T4
LCIE 04ATEX6141X
Zone 0, Group IIC when installed with an approved zener barrier/galvanic isolators.

T4 @ Ta = -40ºC - 100ºC.Electromagnetic Compatibility

Electrostatic Discharge EN 61000-4-2, Criteria A.
Electrical Fast Transients EN 61000-4-4, Criteria A.
Radiated Susceptibility EN 61000-4-3, Criteria A.
Conducted Susceptibility EN 61000-4-6, Criteria A.
Surge Capability EN 61000-4-5, Criteria A.
Magnetic Field EN 61000-4-8, Criteria A.

Environmental Limits

Operating and Storage Temperatures Sensor -54°C to +482°C (-65°F to +900°F).
Mineral Insulated Cable -54°C to +482°C (-65°F to +900°F).
Electronics -54°C to +125°C (-65°F to +257°F).
Soak Back Temperature The electronics will survive temperature exposure of +155°C (+311°F) for four hours without failure. Electrical performance will not be met during this period.
Shock Survivability 19,620 m/s2 (2000 g) peak, maximum.
Relative Humidity 100% condensing, nonsubmerged. Case is hermetically sealed.

Physical

Sensor Dimensions See Figure 1.
Mounting 30.2 mm (1.188 in) square mounting hole pattern, 7.2 mm (0.283 in) mounting holes (4 holes).
Mounting Surface 32 microinch rms.
Material Nickel alloy 600.
Integral Cable Diameter 6.35 ± 1.27 mm (0.25 ± 0.05 in)
Material 300 Series Stainless Mineral Insulated Integral Cable with Stainless Steel Overbraid.
Bend Radius Minimum bend radius of 51 mm (2.0 in).
Integral Electronics Dimensions See Figure 1.
Mounting Patch panel hub mount.
Material 300 series stainless steel.
Connector MIL-DTL-83723/90 - 1006N with gold-plated 300 series stainless steel.
System Weight (without field wiring) 0.545 kg + 0.10 kg/m cable length (1.200 lb + 0.006 lb/in cable length), typical.
Mounting Angle Any orientation

velomitor-1


Descriptions English
HTVAS Datasheet HTVAS Datasheet
ORBIT HTVAS ORBIT HTVAS


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