Kinemetrics EpiSensor2 User manual

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Document 305801
Revision A
August 2015
EpiSensor2
Strong Motion Accelerometer
User Manual

EPISENSOR2USER MANUAL DOCUMENT 305801,REVISION A
Table of Contents
No User-Serviced Parts ................................................................................................................................. 1
Electrical Safety Notice ................................................................................................................................. 1
Introduction and Product Description .......................................................................................................... 1
Electrical Connections................................................................................................................................... 2
EpiSensor2 Cabling........................................................................................................................................ 4
Operational Control of the EpiSensor2......................................................................................................... 8
Full-Scale Ranges....................................................................................................................................... 9
Button Pushing...................................................................................................................................... 9
Digitizer Enable Lines (Q330 used for this description) ........................................................................ 9
RS-232 Command Line Interface........................................................................................................... 9
AUTOZERO .............................................................................................................................................. 10
Button Pushing.................................................................................................................................... 10
Q330 Enable Lines (Q330 used for this description)........................................................................... 10
RS-232 Command Line Interface.........................................................................................................10
CAL (Calibration) ..................................................................................................................................... 11
Q330 Enable Lines (Q330 used for this description)........................................................................... 11
RS-232 Command Line Interface.........................................................................................................11
RESET................................................................................................................................................... 11
Setup and Initial Operation..................................................................................................................... 11
Operational Details ..................................................................................................................................... 12
Choice of Digitizer ................................................................................................................................... 12
Full-Scale Range Selection ...................................................................................................................... 12
AUTOZERO Mode.................................................................................................................................... 12
Calibration (CAL) ..................................................................................................................................... 13
Retention of Settings .............................................................................................................................. 13
Sensor Response Values ......................................................................................................................... 13
Input Power Requirements..................................................................................................................... 13
Thermal Isolation .................................................................................................................................... 14
RS-232 Command Line Interface.................................................................................................................15
Main Page Commands ................................................................................................................................16
Password Protection............................................................................................................................... 17
Operate Page Commands ...................................................................................................................17
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EPISENSOR2USER MANUAL DOCUMENT 305801,REVISION A
Response Page Commands ................................................................................................................. 18
Activity Timeout and Disable .............................................................................................................. 18
Seconds and Ticks ............................................................................................................................... 18
Shipping and Handling ........................................................................................................................ 18
Contact Kinemetrics............................................................................................................................ 18
EpiSensor2 Specifications ........................................................................................................................... 19
Figures
Figure 1: EpiSensor2 module. ....................................................................................................................... 1
Figure 2: Sensor with standard cable........................................................................................................... 5
Figure 3: Standard cable with RS-232 cable connected................................................................................ 5
Figure 4: Pulse-train range signal for +/-4 g range. .................................................................................... 10
Figure 5: Details of leveling feet. ................................................................................................................ 12
Tables
Table 1: Connections to sensor through Souriau 851-07C16-26P50-A7-44 receptacle. .............................. 3
Table 2: Connection details of standard 6 meter cable. .............................................................................. 8
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EPISENSOR2USER MANUAL DOCUMENT 305801,REVISION A
No User-Serviced Parts
The EpiSensor2 is a self-contained seismic accelerometer. There is no reason to open the sensor
package, or to modify the electronics or sensor elements contained within it. There are no internal
manual adjustments to make, nor are there any user-serviced parts within the sensor. Opening and/or
modifying the sensor is unnecessary, and doing so will void the instrument's warranty.
Electrical Safety Notice
As with all electrical instruments, potentially lethal potentials can be present on all metal
surfaces, including conductors within any cables. Proper grounding of these elements is
important to minimize these risks. The user of this product is responsible for its installation and
operation in a safe manner, and in accordance with all local requirements for electrical safety.

EPISENSOR2USER MANUAL DOCUMENT 305801,REVISION A
Introduction and Product Description
The EpiSensor2 is an advanced force-balance, triaxial accelerometer that builds upon the
outstanding record of its predecessor, the EpiSensor (the world's first seismological-grade
strong motion accelerometer). The high dynamic range of the EpiSensor2 allows both weak and
strong motion recording from a single sensor.
The EpiSensor2 provides a broad set of electronically-controlled operational modes, including
range-switching (allowing 4g, 2g, 1g, 0.5g, and 0.25g peak, full-scale ranges), Offset removal
(AUTOZERO mode), and calibration. These modes can be controlled remotely, either via the
digitizer (using selected enable lines) or via an RS-232 command line interface. The sensor also
provides a pushbutton switch for local control. This allows an on-site user to select sensor full-
scale range and AUTOZERO state (ON or OFF).
An important feature of the EpiSensor2 is its very low quiescent power consumption: under 350
mW. The sensor consumes 60% to 70% lower power than competing strong motion
accelerometers. This makes it ideal for remote, battery-powered applications.
The EpiSensor2, and its cabling, are designed for direct connection to Quanterra Q330-series
digitizers, as well as digitizers from the Kinemetrics “Rock” series.
The EpiSensor2 module, and some of its features, are shown in Figure 1.
Figure 1: EpiSensor2 module.
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EPISENSOR2USER MANUAL DOCUMENT 305801,REVISION A
Electrical Connections
The EpiSensor2 contains a Souriau connector on its side. The connections supported by this
receptacle are shown in Table 1.
851-07C16-26P50-A7-44 Receptacle
Pin Designator
Signal Notes
A Z Acceleration +
B Z Acceleration -
C Shield Connection Connected to
ANALOG Ground
D Y Acceleration +
E Y Acceleration -
F Shield Connection Connected to
ANALOG Ground
G X Acceleration +
H X Acceleration -
J Shield Connection Connected to
ANALOG Ground
K Z Channel Range
Indicator
L Y Channel Range
Indicator
M X Channel Range
Indicator
N ANALOG Ground
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EPISENSOR2USER MANUAL DOCUMENT 305801,REVISION A
P CAL Enable Line
(Logic Level)
R AUTOZERO Enable Line
(Logic Level)
S RESET Enable Line
(Logic Level)
T RANGE Enable Line
(Logic Level)
U Enable Return
V CAL Input +
W CAL Input -
X RS-232 TX
Y RS-232 RX
Z RS-232 GND
a Power Bundle Shield/CASE Ground
b Input Power + (9-36V)
c Input Power Return
Table 1: Connections to sensor through Souriau 851-07C16-26P50-A7-44 receptacle.
Note that the shield connections (pins C, F, and J) are provided for redundancy, in specially-designed
cables. Within the standard sensor cabling, these connections are not propagated into the cables, at the
sensor end. Rather, the shield connections are made (only) at the digitizer end of the cable.
The digital enable lines (P, R, S, T, relative to U) are fully-isolated from other lines in the system. They
operate over an approximate 2V to 10V input range. The RS-232 interface (on pins X, Y, and Z) is fully
isolated as well.
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EPISENSOR2USER MANUAL DOCUMENT 305801,REVISION A
The power inputs (pins b and c) require voltage range of 9-36V at the sensor input. This galvanically-
isolated input has reverse-polarity protection, as well as overcurrent protection.
The ANALOG ground line (Pin N) is the common mode voltage reference for the differential signal lines
(pins A-B, D-E, and G-H). It also serves as the reference ground for the range voltage signals (pins K, L,
and M).
The calibration (CAL) input (pins V and W) is differential, with a +/-15V range. The common mode
reference for these signals is ANALOG ground (pin N).
EpiSensor2 Cabling
The standard cable for the EpiSensor2 is shown in Figure 2. This 6 meter long cable (PN: “Epi2.0 320001-
6”) connects to the sensor and to the digitizer. The 10-shell plug in the Y-extension, at the digitizer end,
is dedicated to the isolated RS-232 connection.
Kinemetrics can also supply a simple RS-232 connection cable (PN “Epi2.0 320002-1.5). It connects, as
shown in Figure 3, to the 10-shell plug.
Among other cable options are ones without the RS-232 takeout. This can be used when RS-232 control
is not desired, or when the cable run is beyond the practical limit of RS-232 communications (typically
15 meters).
Kinemetrics can also supply “pigtailed” (connectorless) cables. The maximum cable length is 125 meters,
owing to limitations related to digitizer power sourcing (mainly its voltage) and series resistance in the
power lines contained within the cabling. Operating power for the sensor is generally expected to come
from the digitizer (via pins b and c).
The connections within the standard cable (PN: “Epi2.0 320001-6.”) are listed in Table 2.
For users wishing to create their own cables, Kinemetrics can supply a standard, right-angle, solder-cup,
plug (with cable clamp) that will connect directly to the EpiSensor2. The commercial part number for
this item is Souriau 851-08EC16-26S50-44. This plug, and the connection details in Table 1, are all that
users will need to make connection to the sensor.
Please contact Kinemetrics to discuss specific cable requirements.
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