GeoSIG AC-73 Force Balance Accelerometer User Manual

June 3, 2024
GeoSIG

GeoSIG AC-73 Force Balance Accelerometer User Manual
GeoSIG AC-73 Force Balance Accelerometer

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

Disclaimer
GeoSIG Ltd reserves the right to change the information contained in this document without notice. While the information contained herein is assumed to be accurate, GeoSIG Ltd assumes no responsibility for any errors or omissions.

Copyright Notice
No part of this document may be reproduced without the prior written consent of GeoSIG Ltd. Software described in this document is furnished under a license and may only be used or copied in accordance with the terms of such a license.

Trademark
All brand and product names mentioned are trademarks or registered trademarks of their respective holders.

All rights reserved.

GeoSIG Ltd

Switzerland

Warnings and Safety

 The sensor housing provides no protection against explosive atmosphere. It must not be directly operated in area where explosive gases are present.

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

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.

Binder Serie 623

GeoSIG P/N #J_CIR.012.002.F
Binder Serie 623 P/N 99 4622 00 12

Electrical Connector

Cable gland nut has to be determined as per cable external diameter and must be separately ordered. It has also to provide the cable shield connection to connector case.

Binder Serie 423

GeoSIG P/N #J_CIR.012.010.M
Binder Serie 423 P/N 99 5629 00 12

Electrical Connector

Cable gland nut has to be determined as per cable external diameter and must be separately ordered. It has  also to provide the cable shield connection to connector case.

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 W output impedance
2 B OUTPUT X (-) 0 V ± 10 V voltage output inverted, 47 W output impedance
Brown
3 C OUTPUT Y (+) 0 V ± 10 V voltage output, 47 W output impedance
4 D OUTPUT Y (-) 0 V ± 10 V voltage output inverted, 47 W output impedance
Yellow
5 E OUTPUT Z (+) 0 V ± 10 V voltage output, 47 W output impedance
6 F OUTPUT Z (-) 0 V ± 10 V voltage output inverted, 47 W output 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
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
11 L N/C Reserved
12 M N/C Reserved

Table 1. AC-7x Connector Pin Assignment and Cable Colour Code

Electric Configuration

The full scale is field selectable without gain re-calibration by means of jumpers with fixed 0.1% precise amplifiers.

Electric Configuration

Electric Configuration

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 be sure 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 shall 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 has to be pointed to East or to any other main direction of the structure to monitor. The Axes can then be interpreted as following:

Mounting

The accelerometer has a single-bolt fixation. One M8 expanding nut rock anchor must be used for the sensor fixation.

Screw is applied on the mounting surface using the anchor and 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.

 Do not overtighten the three-point levelling mechanism. This may damage the sensor.

References

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