330750 and 330752 High Temperature Velomitor® Systems

Velocity Sensor

This design segregates the velocity sensor from the signal conditioning electronics by means of a hard-line cable, allowing the velocity sensor to be used in applications with temperatures considerably higher than our other Velomitor® transducers. Current versions of these sensors allow the sensing head to be mounted on surfaces with temperatures as high as +400°C (+752°F).








Parameters are specified from +20 to +30°C (+68 to +86°F) and 100Hz unless otherwise indicated.

Note: Operation outside the specified limits may result in false readings or loss of machine monitoring.


Sensitivity 5.7 mV/mm/s (145 mV/in/s)
Frequency response 15 to 2000 Hz (900 to 120,000 cpm) ± 3.0 dB;
20 to 1000 Hz (1,200 to 60,000 cpm) ± 0.9 dB
Transient Temperature Sensitivity 0.0762 mm/s/°C (0.003 in/s/°C), typical, as defined in ISO 5347- 18:1993(E)
Amplitude range 635 mm/s (25 in/s) peak below 680 Hz.
2940 m/s2 (300 g) peak above 680 Hz.
Vibration at frequencies above 2 kHz will decrease this range.
Transverse sensitivity Less than 5% of Sensitivity
Amplitude linearity ±2% to 152 mm/s (6 in/s) peak
Mounted resonant frequency Greater than 5 kHz
Broadband Noise floor (15Hz to 2kHz) 0.127 mm/s (0.005 in/s) rms nominal
Maximum cable length 305 metres (1000 feet) with no degradation of signal.

Hazardous Area Approvals

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

North America Class I, Div I, Groups A, B, C, and D;
Class II, Div I, Groups E, F, and G;
Class III, Div I.
Ex ia IIC
AEx ia IIC
T4 @ Ta = 100° C
When installed with an approved zener barrier per BN drawing 168077.
Ex nL IIC; Class I, Zone 2
Class I, Div 2, Groups A, B, C, D.
When installed per BN drawing 168077
Europe/ATEX Ex II 1 G
EEx ia IIC T4
T4 @ Ta = -40ºC - 100ºC
Ex II 3 G
T4 @ Ta = -40ºC - 100ºC.

Environmental Limits

Operating and storage temperature range Sensing head Maximum mounted surface temperature −55°C to +400°C (−67°F to +752°F)
Integral hardline cable: −55°C to +400° (−67°F to +752°F)
Electronics: −55°C to +121°C (−67°F to +250°F)
Shock survivability 24,535 m/s2 (2500 g) peak
Relative humidity To 100% non-submerged; case is hermetically sealed.


Weight (typical)

2 metres 635 grams (1.40 lb)
4 metres 794 grams (1.75 lb)
6 metres 953 grams (2.10 lb)
8 metres 1111 grams (2.45 lb)
Mounting See Dimensional Drawings, Figures 1 and 2
Case material 300 series stainless steel.
Connector 2-pin Mil-C-5015 receptacle, hermetically-sealed, 304 stainless steel shell.
Polarity Pin A goes positive with respect to Pin B when the applied velocity is from the base to the top of the transducer.
Bend Radius Minimum bend radius of 51mm (2.0in)

Note: Please read and understand the User Guide before attempting to install and use this product.




Descriptions English
330750 and 330752 High Temperature Velomitor Systems Datasheet 330750 and 330752 High Temperature Velomitor Systems Datasheet
ORBIT 330750 and 330752 High Temperature Velomitor Systems ORBIT 330750 and 330752 High Temperature Velomitor Systems