Casella CEL Sensus data logger unit User Manual
SENSUS Digital Data Logger -
Users Handbook
Digital Data Logger
Users Handbook
April 2002
SENSUS
HB3290-01
COPYRIGHT
The copyright in this document which contains proprietary information is vested in
CASELLA CEL LIMITED. The contents of this document must not be used for purposes
other than that for which it has been supplied or reproduced or disclosed wholly or in
part without the prior written permission of
CASELLA CEL LIMITED
CASELLA CEL
Regent House
Wolseley Road
Kempston
Bedford
MK42 7JY U.K.
Phone: +44 (0) 1234 844 100
Fax: +44 (0) 1234 841 490
E-mail info@casellagroup.com
Web: www.casellagroup.com
CASELLA USA
17 Old Nashua Road #15
Amherst
NH 03031
U.S.A.
Toll Free: +1 800 366 2966
Fax: +1 603 672 8053
e-mail: info@casellausa.com
Web: www.casellausa.com
.
SENSUS Digital Data Logger -
Users Handbook
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SENSUS Digital Data Logger -
Users Handbook
Warnings
WARNINGS !
The SENSUS Logger contains no user serviceable
components. If an electrical fault is suspected the
instrument must be returned to Casella CEL Ltd for repair.
The Logger should not be dropped or subjected to
mechanical shock. Failure to comply will render the
warranty invalid.
The warranty DOES NOT extend to cleaning or general
servicing of the instrument.
Page 3 of 44
Getting Started
SENSUS Digital Data Logger -
Users Handbook
GETTING STARTED
The easiest way to get the Sensus Logger up and running
is to transfer a new profile from the PC application
software Online Pro. With just a few mouse clicks the
Sensus Logger can be tailored to match the sensors used
and begin recording data within minutes.
Page 4 of 44
SENSUS Digital Data Logger -
Users Handbook
Contents
TABLE OF CONTENTS ...........Page
1. DESCRIPTION ..................... 7
2. OPERATION ...................... 8
2.1 Getting Started . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Menu Interface . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Auto Transmit Mode . . . . . . . . . . . . . . . . . . . . 10
2.5 Command Line Interface . . . . . . . . . . . . . . . . . 10
2.6 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.1 Sleep Mode . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.2 LCD and Keys . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.3 Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3. COMMANDS ..................... 13
3.1 Data Channels . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.1 Channel Type . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.3 Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.4 Display Format Specifier . . . . . . . . . . . . . . . . . . 13
3.1.5 Polynomial . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1.6 Applied Function . . . . . . . . . . . . . . . . . . . . . . 14
3.1.7 Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2 Type Specific Configuration . . . . . . . . . . . . . . . . 16
3.2.1 Input Channel . . . . . . . . . . . . . . . . . . . . . . . 16
3.2.2 Single-ended or Differential . . . . . . . . . . . . . . . . 17
3.2.3 Gain Setting . . . . . . . . . . . . . . . . . . . . . . . . 17
3.2.4 Report Count or Frequency . . . . . . . . . . . . . . . . 17
3.2.5 Counter Reset Mode . . . . . . . . . . . . . . . . . . . 17
3.2.6 Select Instrument Type . . . . . . . . . . . . . . . . . . 17
3.2.7 Set Data Value . . . . . . . . . . . . . . . . . . . . . . . 17
4. LOGGING ....................... 18
4.1 Log Rate . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 What Gets Logged ? . . . . . . . . . . . . . . . . . . . . 18
4.3 Internal Capacity . . . . . . . . . . . . . . . . . . . . . . 18
4.4 External Capacity . . . . . . . . . . . . . . . . . . . . . 19
5. INPUT CONNECTIONS ................ 20
5.1 Wire Preparation and Insertion . . . . . . . . . . . . . . 21
5.2 Differential/Single-ended . . . . . . . . . . . . . . . . . 21
5.3 Analog 4-way Connectors . . . . . . . . . . . . . . . . . 22
5.4 Analog 5-way Connectors . . . . . . . . . . . . . . . . . 22
5.5 Counter 3-way Connectors . . . . . . . . . . . . . . . . 23
5.6 Connection Examples . . . . . . . . . . . . . . . . . . . 23
5.6.1 Differential Input . . . . . . . . . . . . . . . . . . . . . . 23
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Contents
SENSUS Digital Data Logger -
Users Handbook
TABLE OF CONTENTS (Continued) .... Page
5.6.2 Single-ended Inputs . . . . . . . . . . . . . . . . . . . 23
5.6.3 4 to 20 mA Current . . . . . . . . . . . . . . . . . . . . 24
5.6.4 4-Wire Resistive . . . . . . . . . . . . . . . . . . . . . 24
5.6.5 Counter.......................... 24
6. COMMUNICATIONS ................. 25
6.1 RS 232 Command . . . . . . . . . . . . . . . . . . . . 25
6.2 SleepMode ....................... 26
6.3 RS 232 Instrument . . . . . . . . . . . . . . . . . . . . 26
6.4 RS 485 Command Alternate . . . . . . . . . . . . . . . 27
6.5 Modems ......................... 27
7. COMPACTFLASH CARDS ............. 28
8. ALARMS ....................... 30
8.1 IDText .......................... 30
8.2 Input Channel . . . . . . . . . . . . . . . . . . . . . . 30
8.3 TestMode ........................ 30
8.4 Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.5 Action . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.6 On/Off Delays . . . . . . . . . . . . . . . . . . . . . . 31
8.7 On/Off Values . . . . . . . . . . . . . . . . . . . . . . 31
8.8 Output Channel . . . . . . . . . . . . . . . . . . . . . 31
8.9 Digital Output . . . . . . . . . . . . . . . . . . . . . . 32
8.10 FastLogMode...................... 32
8.11 Modem.......................... 32
8.12 Phone Number . . . . . . . . . . . . . . . . . . . . . . 32
8.13 SMS Phone Numbers . . . . . . . . . . . . . . . . . . 32
8.14 Channel List . . . . . . . . . . . . . . . . . . . . . . . 32
8.15 Alarm Flags . . . . . . . . . . . . . . . . . . . . . . . . 33
9. ANALOG OUTPUT .................. 34
10. INTEGRATED SENSORS ............... 35
10.1 Temperature . . . . . . . . . . . . . . . . . . . . . . . 35
10.2 Barometric Pressure . . . . . . . . . . . . . . . . . . . 35
11. POWER SUPPLIES .................. 37
11.1 Solar Power . . . . . . . . . . . . . . . . . . . . . . . 37
11.2 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . 37
12. SERVICING ...................... 38
13. SPECIFICATION ................... 39
13.1 Channel Information . . . . . . . . . . . . . . . . . . . 39
13.2 Display and Keypad . . . . . . . . . . . . . . . . . . . 42
13.3 General.......................... 42
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SENSUS Digital Data Logger -
Users Handbook
Description
1. DESCRIPTION
The SENSUS Digital Data Logger from Casella CEL is a professional
instrument specifically designed to monitor and record measurements from a
comprehensive array of sensor technologies, whether measuring process
temperatures using simple resistance thermometers or airport traffic noise
levels from a sound level meter the SENSUS Logger is more than capable.
From beginning to end the SENSUS has been designed with the
user in mind.
Figure 1: The Sensus Data Logger
Secure spring loaded connector blocks attach the all-important
sensor outputs to the SENSUS input stage, precision analog circuitry
transfers these values to the high-speed microprocessor which processes
and stores the data in reliable Flash memory.
A comprehensive set of alarm functions allow the Sensus Logger to
make decisions based on a wide range of input data, the results of these
decisions can then be broadcast to other computer/control systems via
modem or to specified operators using a GSM modem/SMS service.
Page 7 of 44
Operation
SENSUS Digital Data Logger -
Users Handbook
2. OPERATION
2.1 Getting Started
The easiest way to get the Sensus Logger up and running is to transfer a
new profile from the PC application Online Pro. With just a few mouse clicks
the Sensus Logger can be tailored to match the sensors used and begin
recording data within minutes.
2.2 Introduction
The Sensus is designed to start processing/logging data as soon as power is
applied to it and to continue to do so until power is removed. This means that
should power to the logger be interrupted for any reason, the unit will recover
and continue collecting data when power is restored without any user
intervention.
When the Sensus Logger is powered-up, it re-configures itself
automatically, based upon a set of operating parameters held in its internal
profile. Once the contents of the profile have been processed the logger
begins its task of collecting/logging data.
Most aspects of the loggers operation can be changed by the user,
either via the menu system or via the command line interface. Both of these
configuration tools are accessible via the RS232 command interface.
The factory default setting for the RS232 command interface is 9600
baud, 8 data bits, 1 stop bit, no parity and no handshake. The configuration
tools can be accessed manually using any terminal interface program, (such
as Hyperterm, as supplied with the WindowsTM operating system).
The menu system is more useful for manual reconfiguration where
a few parameters are to be changed or a new sensor added. The command
line interface is of more use where an automatic configuration is needed and
it is this approach that is used by the Online Pro application to provide
automated configuration. The menu system is activated by default but it can
switch between the two as and when required.
While the Sensus Logger is running it is at all times performing a
series of tasks in the background.
Sensor scanning: This task is performed at regular intervals
determined by the period set in the
profile. Each time it runs fresh data is
collected from the attached sensors, this
data is in turn processed to provide the
values logged by the system and used in
alarm comparisons.
Logging: Again, this task is performed at an interval
defined in the profile. While running, all
data values marked to be logged are
moved to a holding buffer then written
either to the internal memory or to
external CompactFlash card.
Alarms: At fixed intervals current data values are
compared against active alarm channels
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SENSUS Digital Data Logger -
Users Handbook
and alarm states and actions are updated
at this time.
Operation
2.3 Menu Interface
This interface is the default selection when the Sensus Logger is switched
on. The clear and easy to follow structure allows the user to redefine most
aspects of the loggers configuration with ease.
When navigating around the menu system the following rules apply.
Action Result
Pressing the Escape key This cancels the current operation and
causes the menu system to step back a
level without making any changes.
This can be done at any prompt.
Pressing the Backspace key
Deletes the last character entered from
the input buffer.
The Logger responds with Backspace-
Space-Backspace to remove character
from display.
Type a menu option number and press the Enter key
Executes the function associated with
that menu option number.
Typing text All typed text should be in lowercase
except where the text is contained in
quotes , here mixed case text can be
used.
All prompts limit the amount of text that
can be entered by the user, when this
limit is reached further characters are
ignored.
Typing an empty string Where a blank string needs to be entered
(for example, to clear the loggers ID text)
this can be achieved by typing a pair of
double quotes without any spaces
between ( ).
To read a value Select the menu option number for that
value, the menu system always prints the
current value before the prompt to
change it.
Once displayed press the Escape key.
To change a value Select the menu option number for that
value and when prompted for a new
value type it in and press the Enter key.
Continuous output Where the menu system is continuously
outputting values (data display option)
pressing the Escape key will terminate
the option and return control to the parent
menu.
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Operation
No activity If the menu system detects no user
activity for more than 60 seconds then it
will automatically terminate the current
option and return control to the parent
menu.
This ensures the menu system will return
to a safe state if communication should
fail. The only exception to this is where
the user has selected continuous output.
SENSUS Digital Data Logger -
Users Handbook
2.4 Auto Transmit Mode
A special feature of the menu interface, is the availability of an Auto Transmit
mode, for use where data must be sent by the Sensus at regular intervals
without further user intervention.
When enabled, the Sensus will wait at the main menu prompt for a
specified period of inactivity. When this occurs, the current data values are
collected and transmitted over the command interface together with an 8-bit
checksum value. This data collection and transmission sequence is repeated
at a specified rate until command activity is detected, at which time, the main
menu regains control of the interface.
2.5 Command Line Interface
This interface can be activated at any time from an option in the top-level
menu of the menu interface. Once activated the menu system is suspended
until the command line interface is closed, which is achieved by pressing the
Escape key when at the command line prompt.
The command line interface represents itself by displaying a single
greater- than character (>), this is the command line prompt.
Commands are entered in lowercase (except for quoted text which
can have mixed cases). Each command consists of two parts, the command
name and its parameters. The parameters are separated from the command
name by enclosing them in round brackets ( () ).
Typing a question mark ( ? ) allows the user to search for likely
commands followed by some portion of the command name, some
command search examples are given here:
Search pattern Result
>?date setdate
>?rate setscanrate
setfastscanrate
setlograte
setfastlograte
Some examples of command formats are given below.
Command Function
>setloggeridtext(Test field 1) Set the loggers id text to
Test field 1"
>setchandesc(1,Cabinet humidity) Set the channel description
for data channel 1 to
Cabinet humidity
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SENSUS Digital Data Logger -
Users Handbook
>setchanpolynomial(1,0.0,1.23) Set the scaling polynomial
for data channel 1 to
C=0.0, X1=1.23
As with other prompts, if the logger detects no user activity for 60 seconds,
then the command line interface terminates and control returns to the menu
interface, top level.
Operation
2.6 Display
The Sensus Logger supports a
2-line by 20-character LCD
module, 4 keys and a buzzer.
The display provides
information about the internal
status of several of the key
functions of the logger, these
include date/time, active channels
and logging summary.
2.6.1 Sleep Mode
The LCD will always show
something, unless the logging
period has been set to one minute
or more, whereupon an internal
power-save function comes into effect and the LCD becomes blank,
switching on again only as data is logged.
Should the LCD be blank, it can be reactivated immediately (without
having to wait for a log cycle) by pressing any one of the front panel keys.
Key 1 Key 2 Key 3 Key 4
2.6.2 LCD and Keys
The LCD incorporates a back light that is lit for a few seconds on every key
press.
Keys 1 and 4, (the two end keys, see Figure 2) are used to scroll
between the available status screens. This is indicated by the up and down
arrows depicted on the LCD above the corresponding keys. Where further
information is available for viewing, left and right arrows will be added above
keys 2 and 3. Use these keys to display any additional information for the
option. At any time key 1 or key 4 can be used to move to the next/previous
status screen.
Should a selection become necessary, the annotation for key 2 will
change to N (indicating No) and for key 3 to Y (indicating Yes). Figure 3
shows the Sensus menu structure.
2.6.3 Buzzer
The buzzer gives the user an audible indication that a key press has been
recognised. In addition, the buzzer can be assigned to one or more of the
alarm channels, to give an audible indication when the alarm becomes active.
13:45:00
22/12/2001
01096
Figure 2: The layout of the LCD
and keypad.
Page 11 of 44
Operation
13:30:00, 15/12/2001
13:30:00, 15/12/2001
Last record:
Last record:
SENSUS Digital Data Logger -
Users Handbook
02018
995.0 mbar
Ch: 07,
...
Figure 3: Menu Structure of the Sensus data logger
13:45:00
Page12of44
installed in the Casella Nomad weather station
Switching off
N
Y
Switch off ?
22/12/2001
Power control
Supply: 13.6 V
o
Temp.: +22.7 C
80-XXXXXXA-22
System information
03:10:00, 30/06/2001
03:10:00, 30/06/2001
First record
First record
254
254
Int. record count:
Ext. record count:
Logging information
See note 1
(Run)
Enabled (paused)
(Pause)
Enabled
Logging control
(Run)
Disabled (paused)
(Pause)
Disabled
See note 2
Ch:...
...
Ch:...
1.3 m/s
Ch: 02,
0.0 mm
Ch: 01,
Data values
See note 3
CF card ? version ?
CF card ? serial ?
CF card present
CF card detected
CF slot empty
CF card error
CF card full
CF card ? unknown ?
CF card *BUSY*
If a CF card is present in the slot when this option is selected, then the six screens will display information relating to the data stored on the card.
Notes 1.
If there is no card present, the screens will display information relating to data stored internally in the Sensus logger.
If logging is currently enabled, then the top two screens will be shown. When logging is NOT enabled, the bottom two will be shown.
The CF display screens change automatically, depending on the current state of the CF card installed (if any). Apart from inserting or removing a
CF card, the user has no control over which of these screens is displayed.
2.
3.
SENSUS Digital Data Logger -
Users Handbook
Commands
3. COMMANDS
A full and detailed description of all the commands available on the Sensus
Logger is beyond the scope of this handbook. When this information is
essential to your particular application, please contact Casella CEL and
request a copy of the document: Sensus - A Programmers Guide (HB3291).
3.1 Data Channels
The configuration information stored in a data channel controls how input
data is collected, processed and stored by the logger.
3.1.1 Channel Type
The channel type allocated to a data channel controls where the channel will
go in order to obtain real world measurements.
Allowable channel types are detailed below.
Data Channel Type Function
Analog Readings are taken from analog input
signals (differential or single-ended).
Counter Readings are taken from digital counter
inputs.
Data Readings are taken from other data
channels.
Instrument Readings taken from RS232 Inst. interface
Passive This data channel type does not obtain
readings itself, rather it waits to be
updated from other sources (for example
alarms).
Parameter Allows values held in the loggers
parameter space (system variables) to be
processed just like other data.
Options and settings that differ depending on the channel type selected will
be explained in greater detail in Section 2.2, Type Specific Configuration. The
following paragraphs describe options that are common to all channel types.
3.1.2 Description
The text allocated to the data channels description tells the user the physical
property actually being measured by the channel. The text is used to identify
the channel contents in alarm messages and other outputs.
3.1.3 Units
This text identifies the measuring units used when presenting data for the
channel. This is used in alarm messages, logging to CompactFlash cards
and LCD messages.
3.1.4 Display Format Specifier
The text allocated to this parameter controls how data values for the channel
are presented to the user. This specifier controls whether a value is signed,
the field width and the number of decimal places. Character positions are
indicated by the hash ( # ) or zero ( 0 ) characters. Some format specifier
examples are given below.
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Commands
Format Specifier Result
####.# 12.3 (Blank fill, sign optional)
1234.5
-1234.5
-1.2
+####.# +12.3 (Blank fill, sign mandatory)
+1234.5
-1234.5
-1.2
0000.0 0012.3 (Zero fill, sign optional)
1234.5
-1234.5
-0001.2
+0000.0 +0012.3 (Zero fill, sign mandatory)
+1234.5
-1234.5
-0001.2
This determines only how data is presented to the user, data is still
processed and logged with full precision.
SENSUS Digital Data Logger -
Users Handbook
3.1.5 Polynomial
The factors assigned to this polynomial dictate how data values are
scaled/converted from raw voltage/count values to real physical quantities.
Each data channel has room for an 8-term polynomial, one constant and 7
X-terms.
The format for the polynomial is as follows:
C, X-term, X2-term, X3-term, X4-term, X5-term, X6-term, X7-term
The polynomial is calculated as follows:
y=P0+xP1+x2P2+x3P3 + x4P4 + x5P5+x6P6 + x7P7
Where: y = the result
x = the input value
P0 = X-term
Pn = Xn-term (where n = 1 to 7)
Define only those terms required by the conversion in question, all additional
unnecessary terms add to the processing time required for this channel.
3.1.6 Applied Function
The applied function property allows for further processing to be applied to
data values far beyond the scope of simple scaling. Functions exist that allow
averaging, min/max hold and crosswind calculation.
A list of available functions together with examples is given in Table 1 below.
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