Velomitor® 350900 High-Temperature Velocity and Acceleration Sensor (HTVAS)
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).
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.
|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).|
|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.|
|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
T4 @ Ta = -40ºC - 100ºC
Ex II 3 G
EEx nA II T4
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.|
|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.|
|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|