Electrogastrography (EGG)
Sensor Data Sheet

EGG 14052020

SPECIFICATIONS> Gain1: 6114
> Range: ±0.25mV (with VCC = 3.0V)> Bandwidth: 0.01591-0.1591 Hz> Consumption: ≈ 3mA> Input Impedance: > 100 GOhm
> CMRR: 100 dB> Input Voltage Range: 1.8 - 5.5 V
FEATURES> Single-channel sensor> Unobtrusive & lightweight sensor> Bipolar differential measurement> Pre-conditioned analog output> High signal-to-noise ratio> Ready-to-use form factor> Medical-grade raw data output
APPLICATIONS> Bowel motility analysis> Gastric contractions detection> Life sciences studies> Biomedical device prototyping
GENERAL DESCRIPTION
The biosignalsplux Electrogastrography(EGG) sensor has been designed for userfriendly recording of the electrical activity ofthe stomach. Multiple sensors can be usedsimultaneously in a cost-effective andstraightforward way to assess bowel motility
and overall gastric activity, for instance.
The bipolar configuration, with two
measurement electrodes, detects theelectrical potentials in the specific stomach
region of choice, with respect to a referenceelectrode (placed in an area of low
bioelectrical activity). The resulting signal isthe amplified difference between these twoleads, eliminating the common unwantedsignals. Its convenient form-factor enables
a discrete application in the typical EGG
locations.

Fig. 1 biosignalsplux Electrogastrography (EGG) sensor(standard version)

Fig. 2 Typical unfiltered EGG output (with subject at rest
and presenting basal gastric activity)

Fig. 2..

Fig. 3 Recommended EGG electrode placement image
based on the graphical resource available online

1 This sensor has a high amplification gain, reason for which it is particularly sensitive to noise resulting electromagnetic

and motion sources. For optimal performance, it is therefore recommended that data acquisition is done in an
appropriate environment and with the subject in stationary position. Power supplies, lighting and other common
household elements are prone to introduce parasite signals. Measurement in dynamic conditions is prone to be affectedby motion artifacts.
PLUX – Wireless Biosignals, S.A.
Av. 5 de Outubro, n. 70 – 2.
1050-059 Lisbon, Portugal
plux@plux.info
http://biosignalsplux.com/
REV A© 2020 PLUXThis information is provided "as is," and we make no express or implied warranties whatsoever with respect to functionality, operability, use,fitness for a particular purpose, or infringement of rights. We expressly disclaim any liability whatsoever for any direct, indirect, consequential,incidental or special damages, including, without limitation, lost revenues, lost profits, losses resulting from business interruption or loss of data,
regardless of the form of action or legal theory under which the liability may be asserted, even if advised of the possibility of such damages.

Electrogastrography (EGG)
Sensor Data Sheet

EGG 14052020

APPLICATION NOTES
A possible configuration was proposed by Riezzo et. al.2 (Fig. 3) can be achieved through thefollowing guidelines:“…a main electrode (electrode 3) located 2 cm above the mid-point between the xiphoidprocess and the umbilicus. Two more electrodes (electrodes 2 and 1) were located on an
upper 45 degree angle, with an additional electrode (electrode 4) located 4 cm to the right ofthe central electrode. The common reference electrode (CM) was placed at the cross point oftwo lines, one horizontal-connecting electrode 1 and the other vertical-connecting electrode3. The ground electrode was placed on the left costal margin…”
TRANSFER FUNCTION[-0.25mV, 0.25mV]
𝐴𝐷𝐶1( 𝑛− ) × 𝑉𝐶𝐶
2−12
𝐸𝐺𝐺(𝑉) =𝐺𝐸𝐺𝐺
𝐸𝐺𝐺(𝑚𝑉) = 𝐸𝐺𝐺(𝑉) × 1000
𝑉𝐶𝐶 = 3𝑉 (operating voltage - 3V when used with biosignalsplux)
𝐺𝐸𝐺𝐺 = 6114 (sensor gain)
𝐸𝐺𝐺(𝑉) – EGG value in Volt (𝑉)
𝐸𝐺𝐺(𝑚𝑉) – EGG value in millivolt (𝑚𝑉)
𝐴𝐷𝐶 – Value sampled from the sensor/channel (digital value)𝑛 – Sampling resolution3

ELECTRODE CONNECTIONS
Sleeve Color
Electrode Cable

Red+Black-White
reference

2 G. Riezzo, F. Russo, and F. Indrio, “Electrogastrography in adults and children: The strength, pitfalls, and clinicalsignificance of the cutaneous recording of the gastric electrical activity,” Biomed Res. Int., vol. 2013, 2013.
3
The number of bits for each channel depends on the resolution of the Analog-to-Digital Converter (ADC); inbiosignalsplux the default is 16-bit resolution (𝑛 = 16), although 12-bit (𝑛 = 12) and 8-bit (𝑛 = 8) may also be found.

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Electrogastrography (EGG)
Sensor Data Sheet

EGG 14052020

PHYSICAL CHARACTERISTICS> W1 x L1 x H1:
1.6cm x 2.2cm x 0.5cm > W2 x L2 x H2:
1.4cm x 1.7cm x 0.5cm
> W3:
> L3:
1.1 ± 0.1cm
0.6 ± 0.1cm
> A1:
> A2:
105.0 ± 0.5cm
28.0 ± 0.1cm
> A3:
> D:
8.0 ± 0.1cm
0.4 ± 0.1cm> S:
0.3 ± 0.1cm> Available sleeve colors: White, Black, Blue, Green, Red, Yellow, Gray, and Brown

Fig. 4 Physical characteristics of the standard EGG sensor.

ORDERING GUIDESKU Reference
PLUX CodeSENSPRO-EGG
820201233
Description
Gastric activity specialized measurement sensor.

UPC
785614265150

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