Vibro-meterGSI127 galvanic separation unit

KEY FEATURES AND BENEFITS

• From the vibro-meter ® product line

• Power supply for sensors and/or signal 

conditioners with a current output or a 

voltage output

• 4 kVRMS galvanic separation between the 

sensor side and the monitor side

• 50 VRMS galvanic separation between the 

power supply and the output signal 

(floating output)

• High rejection of frame voltage

• μA to mV transfer function for current-signal 

transmission over longer distances 

• V to V transfer function for voltage-signal 

transmission over shorter distances

• Available in standard versions and Ex versions 

certified for use in potentially explosive 

atmospheres (hazardous areas)

• Compatible with all vibro-meter

sensors / measurement chains

• Also compatible with industry-standard IEPE 

sensors and 4 to 20 mA loop-powered sensors, 

including vibration sensors/transmitters

• No ground connection needed

KEY BENEFITS AND FEATURES (cont’d)

• Suitable for use in functional safety contexts: 

SIL 2 in accordance with IEC 61508

• Removable screw-terminal connectors

• DIN-rail mounting

APPLICATIONS

• All vibro-meter sensors / measurement chains

• Safety-related applications

DESCRIPTION

The GSI127 is a galvanic separation unit from 

Parker Meggitt’s vibro-meter ® product line. It is 

designed for operation with the signal conditioners, 

charge amplifiers and electronics (attached or 

integrated) used by various vibro-meter

measurement chains and/or sensors.

Compatible devices include the IPC707 signal 

conditioners (charge amplifiers) used by CAxxx 

piezoelectric accelerometers and CPxxx dynamic 

pressure sensors (and older IPC704 signal 

conditioners), the IQS9xx signal conditioners used by 

TQ9xx proximity sensors (and older IQS4xx signal …

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DESCRIPTION (continued)

conditioners), the attached or integrated electronics 

used by CExxx piezoelectric accelerometers, and the 

integrated electronics used by the VE210 velocity 

sensor. The GSI127 is also compatible with industrystandard IEPE (integrated electronics piezo electric) 

sensors such as the CE620, CE630 and PV660 

vibration sensors, and 4 to 20 mA loop-powered 

sensors such as the CE687 and PV685 vibration 

sensors.

Note: The variant of the GSI127 defined by the 

ordering option code B11 is compatible with IQS91x 

signal conditioners and/or industry-standard 

4 to 20 mA loop-powered sensors/transmitters.

The GSI127 galvanic separation unit is a versatile unit 

that can be used for the transmission of highfrequency AC signals over long distances in 

measurement chains using current-signal 

transmission or as a safety barrier unit in 

measurement chains using voltage-signal 

transmission. More generally, it may be used to 

supply any electronic system (sensor side) having a 

consumption of up to 21 mA.

The GSI127 also rejects a large amount of the frame 

voltage that can introduce noise into a measurement 

chain. (Frame voltage is the ground noise and AC 

noise pickup that can occur between the sensor case 

(sensor ground) and the monitoring system 

(electronic ground)). In addition, the design of its 

internal power supply results in a floating output 

signal, thereby eliminating the need for an additional 

external power supply such as a APF19x.

Ex versions of the GSI127 are certified to be installed 

in an Ex Zone 2 (“Ex ec”) when supplying 

measurement chains installed in Ex environments up 

to Zone 0 (“[ ia Ga ]”). These units can also eliminate 

the need for additional external Zener barriers.

The GSI127 housing features removable screwterminal connectors that can unplugged from the 

main body of the housing to simplify installation and 

mounting. It also features a DIN-rail mounting 

adaptor for direct mounting on a DIN rail.

In addition, the GSI127 incorporates diagnostics that 

automatically and remotely indicates the health/

status of the measurement chain so you always know 

when measurements can be trusted. The diagnostics 

(SIL 2 “by design”) bring enhanced reliability and 

significant risk reduction, making the GSI127 suitable 

for use in safety-related applications (functional 

safety contexts).

For specific applications, contact your local 

Parker Meggitt representative.

BLOCK DIAGRAM

SPECIFICATIONS 

Environmental

General

Temperature

• Operating : −20 to 70°C (−4 to 158°F)

• Storage : −40 to 85°C (−40 to 185°F) 

Humidity

• Operating : 90% max. non-condensing

• Storage : 95% max. non-condensing

Protection rating

(according to IEC 60529)

: IP20.

Note: The GSI127 is suitable for indoor use only unless it is installed in 

an industrial housing or enclosure that ensures a higher level of