GeoSIG AC-73 User manual

GeoSIG Ltd, Wiesenstrasse 39, 8952 Schlieren, Switzerland
Phone: + 41 44 810 2150, Fax: + 41 44 810 2350
i[email protected], www.geosig.com
User Manual
AC-73 Force Balance Accelerometer

User Manual AC-73 Force Balance Accelerometer
2 / 7 03.03.2023 / V9
GS_AC-73_UserManual_V09
Document Revision
Version
Date
Modification
Prepared
Checked
Released
1
05.12.2012
First issue
MAE
SER
TAB
2
19.12.2012
Pin out
TAB
MAE
TAB
3
20.12.2012
Minor corrections
MAE
TAB
MAE
4
23.09.2013
Minor corrections
JLT
MAE
MAE
5
24.03.2017
Full scale selection for internal version.
Details on test pulse input.
New Product Picture
JON
PAT
JON
6
08.05.2019
Spelling and Grammar Corrections
VAG
JOG
VAG
7
24.02.2022
Housing drawing update
KEC
ALB
KEC
8
04.08.2022
Updated Chapter 2, connector types
ALM
ALB
KEC
9
03.03.2022
Updated electrical connector information
& photos
KEC
ALB
VAG
Disclaimer
GeoSIG Ltd reserves the right to change the information contained in this document without notice. While the information cont
ained
herein is assumed to be accurate, GeoSIG Ltd assumes no responsibility for any errors or omissions.
Copyright Noti
ce
No part of this document may be reproduced without the prior written consent of GeoSIG Ltd. Software described in this docume
nt is
furnished under a license and may only be used or copied in accordance with the terms of such a license.
Trademark
All bra
nd and product names mentioned are trademarks or registered trademarks of their respective holders.
All rights reserved.
GeoSIG Ltd
Switzerland

User Manual AC-73 Force Balance Accelerometer
03.03.2023 / V9 3 / 7
GS_AC-73_UserManual_V09
Table of Contents
Warnings and Safety ........................................................................................................... 3
1. Basic specifications ......................................................................................................... 4
2. Electrical Connector ........................................................................................................ 4
2.1. Binder Serie 623 .....................................................................................................................................4
2.2. Binder Serie 423 .....................................................................................................................................5
2.3. Connector Pin Description ......................................................................................................................5
3. Electric Configuration ...................................................................................................... 6
4. Mounting.......................................................................................................................... 7
List of Figures
Figure 1, Binder Serie 623 Connector ............................................................................................................4
Figure 2, Binder Serie 423 connector.............................................................................................................5
Figure 3. Full scale selection for external AC-7x. .........................................................................................6
Figure 4. Full scale selection for internal AC-7x. ..........................................................................................6
Figure 5, Sensor housing dimensions ..........................................................................................................7
Warnings and Safety
a
The sensor housing provides no protection against explosive atmosphere. It must not
be directly
operated in area where explosive gases are present.

User Manual AC-73 Force Balance Accelerometer
4 / 7 03.03.2023 / V9
GS_AC-73_UserManual_V09
1. Basic specifications
Sensor Series AC-7x
Input range Acceleration, ±0.5, ±1.0, ±2.0, ±3.0 or ±4.0 g
Output range 0 ± 10 Volt differential output (20 Vpp)
Frequency range DC to 200 Hz
Protections All connector pins are over voltage protected by Transzorb diodes
Power supply 9.5 – 18 VDC
Current drain Average 90 mA @ 15 VDC
Test input range 3-36 VDC
2. Electrical Connector
All the AC-7x accelerometers are supplied as standard with a 2 m connection cable. Based on the intended
use, the 12-pin metallic-style connectors will be supplied in one of the following options: Binder Serie 623 or
Binder Serie 423.
2.1. Binder Serie 623
GeoSIG P/N #J_CIR.012.002.F
Binder Serie 623 99 4606 00 12
Figure 1, Binder Serie 623 Connector
The cable gland nut is determined according to external diameter of the cable and must be ordered separately.
It must also provide the cable shield connection to the connector case.

User Manual AC-73 Force Balance Accelerometer
03.03.2023 / V9 5 / 7
GS_AC-73_UserManual_V09
2.2. Binder Serie 423
GeoSIG P/N #J_CIR.012.010.M
Binder Serie 423 P/N 99 5629 00 12
Figure 2, Binder Serie 423 connector
The cable gland nut is determined according to external diameter of the cable and must be ordered separately.
It must also provide the cable shield connection to the connector case.
2.3. Connector Pin Description
The connector pin assignment and cable colour code can be observed in the table below:
Binder Connector
SIGNAL Comment Colour
Serie
623
Serie
423
Pinout Pinout
1 A OUTPUT X (+) 0 V ± 10 V voltage output, 47 Ωoutput impedance White
2 B OUTPUT X (-) 0 V ± 10 V voltage output inverted, 47 Ωoutput impedance Brown
3 C OUTPUT Y (+) 0 V ± 10 V voltage output, 47 Ωoutput impedance Green
4 D OUTPUT Y (-) 0 V ± 10 V voltage output inverted, 47 Ωoutput impedance Yellow
5 E OUTPUT Z (+) 0 V ± 10 V voltage output, 47 Ωoutput impedance Grey
6 F OUTPUT Z (-) 0 V ± 10 V voltage output inverted, 47 Ωoutput impedance Pink
7 G TEST INPUT Test input, output will result in a sensor step response Blue
8 H GND Connected to Recorder’s GND Red
9 J +12 VDC power Power input, +9.5 to +18 VDC range, 90 mA @ +15 VDC Black
10 K 0 VDC power Power return Violet
11 L N/C Reserved Grey/Pink
12 M N/C Reserved Red/Blue
Table 1. AC-7x Connector Pin Assignment and Cable Colour Code

User Manual AC-73 Force Balance Accelerometer
6 / 7 03.03.2023 / V9
GS_AC-73_UserManual_V09
3. Electric Configuration
The full scale is field selectable without gain re-calibration by means of jumpers with fixed 0.1% precise
amplifiers.
Figure 3. Full scale selection for external AC-7x.
Figure 4. Full scale selection for internal AC-7x.
0.5 g
1 g
2 g
3 g
4 g

User Manual AC-73 Force Balance Accelerometer
03.03.2023 / V9 7 / 7
GS_AC-73_UserManual_V09
4. Mounting
Small size and single bolt attachment allow the AC-7x to be easily installed, saving installation time. The
integrated bubble level simplifies the levelling done by the three-point levelling screws.
The accelerometers must be firmly mounted to a surface and levelled, as the application requires. Check to
ensure that the accelerometer is aligned to produce the desired output signals.
Depending on the measurement setup, the sensor axes should be aligned to the monitored structure (any
main direction of the structure) or to the coordinate plane (North/South, East/West).
Acceleration in the arrow direction indicated on the case will produce a positive output signal.
In case the sensor will be aligned to the coordinate plane, make sure the surface has a scribed north/south
orientation line accurately surveyed from reliable markers. The X-axis of the sensor must be pointed to East
or to any other main direction of the structure to monitor. The axes can then be interpreted as following:
•+X = East
•+Y = North
•+Z = Vertical (Up)
Figure 5, Sensor housing dimensions
The accelerometer has a single-bolt fixation. One M8 expanding nut rock anchor must be used for the sensor
fixation.
The screw is applied on the mounting surface using the anchor, and the screw head is left outcropping for 1-2
cm. The sensor then is slotted via the opening under the sensor housing.
Levelling can be done with the help of the bubble level on the housing and the three-point levelling mechanism.
a
Do not overtighten the three-point levelling mechanism. This may damage the sensor.