Technical specifications for 444-311-000-023

Description

444-311-000-023
Vibro Meter CE311 piezoelectric
accelerometer
KEY FEATURES AND BENEFITS
From the vibro-meter® product line
Sensitivity: 50 µA/g
Frequency response: 2 to 8000 Hz
Temperature range: −40 to 125°C
Long-distance signal transmission
Integrated electronics
Integral case insulation
Available in standard versions and
Ex versions certified for use in potentially
explosive atmospheres
APPLICATIONS
Vibration monitoring in harsh industrial
environments and/or hazardous areas
DESCRIPTION
The CE311 piezoelectric accelerometer from
Meggitt’s vibro-meter® product line is a vibration
sensor designed for the monitoring and
protection of machinery in harsh industrial
environments and/or hazardous areas.
The CE311 sensor features a symmetrical shearmode measuring element using polycrystalline
material. The sensor uses integrated electronics to
provide the required signal processing,
eliminating the need for an external signal
conditioner (charge amplifier). The electronics
also performs charge-to-current conversion in
order to provide a current-modulated output
signal that is suitable for transmission over long
distances.
The CE311 is fitted with an integral cable (twisted
pair, shielded) in a hermetically sealed link,
protected by a flexible, leak-tight protection tube
(stainless-steel hose). More specifically, the sensor
and protection tube are hermetically welded to
one another, resulting in a system that is fully
protected against cooling fluids, lubricants, water,
steam and other potential contaminants. This
makes the CE311 an extremely reliable device
suitable for the long-term monitoring of vibration
in many industrial applications.
General
Input power supply requirements : 15 to 28 VDC, with a bias (standby) current of 5.5 to 7.5 mA
Signal transmission : Current-modulated output (2-wire system)
Signal processing
Internal : Integrated electronics (charge-to-current conversion)
External : Galvanic separation unit and/or monitoring system electronics
Operating
(At 23°C ±5°C, 73°F ±9°F)
Sensitivity : 50 µA/g ±5%
Dynamic measurement range : 0.004 to 40 gpeak
Overload capacity (spikes) : Up to 100 gpeak
Linearity : ±1% over dynamic measurement range
Transverse sensitivity : <3% (measured at 15 Hz with 5 g)
Resonant frequency (mounted) : 20 kHz typ.
Frequency response : −3 dB at 2 Hz.
<±5% between 6 and 5000 Hz.
<±10% between 5000 and 8000 Hz.
Capacitance (nominal)
Pole to pole : 10.5 nF for sensor + 105 pF/m of cable
Pole to casing : 20.0 pF for sensor + 200 pF/m of cable
Environmental
Temperature range
Continuous operation : −40 to 125°C (−40 to 257°F)
Short-term survival (15 minutes max.) : −55 to 150°C (−67 to 302°F)
Temperature sensitivity error
with respect to 23°C (73°F)
: ±5% between −40 and 125°C (−40 to 257°F)
Shock acceleration : 500 gpeak (half-sine wave, 1 ms duration)
Corrosion, humidity
Sensor : Stainless steel (1.4441), hermetically welded
Protection tube : Stainless steel (1.4541), hermetically welded
Note: The sensor and protection tube are hermetically welded to one another to create a leak-tight assembly
that is impervious to 100% relative humidity, water, steam or oil, sea-salt atmospheres and other potential
contaminants such as dust, fungus and sand.
Base strain sensitivity : 0.0015 g/µε typ.
Calibration
Dynamic calibration at factory at 120 Hz and 5 gpeak (23°C, 73°F). No subsequent calibration necessary.
Mechanical
Dimensions : See Mechanical drawings on page 5
Connection : Flying leads
Weight
Sensor : 245 g (0.54 lb) approx.
Cable/flexible stainless-steel hose
(protection tube)
: 135 g/m (0.091 lb/ft) approx.
Mounting : Four M6 × 35 Allen bolts (hexagonal socket head), 12.9 steel,
according to DIN 912 (ISO 4762) with
four M6 spring-steel washers, according to DIN 7980.
Mounting torque of 15 Nm (11.1 lb-ft).

ORDERING INFORMATION
To order please specify
Type
CE311
Designation
Different versions of the piezoelectric accelerometer: – Standard version with 6 m integral cable
Part number (PNR): 444-311-000-023