Omega Products DPG4000-SW Installation Manual

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User ’s Guide

M-4934/0710

DPG4000-SW Data Logging Software

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WARNING: These products are not designed for use in, and should not be used for, human applications.

1. Introduction

This Manual describes the data logging capability and operation of the
pressure gauge, plus the operation of the related DPG4000-SW
Microsoft Windows application. All DPG4000's with firmware with
revision 3.0 or higher are capable of data logging when used with the
DPG4000-SW software. This manual complements and extends the
user manual received with the pressure gauge. Please refer to the
gauge manual for additional information on its operation.

The DPG4000-SW Data Logging Software application is used to
configure logging parameters in the gauge, and to retrieve logged data
from the gauge for storage and analysis on a personal computer.
Before you start check to make sure your data logging kit came with
the following items:

1) DPG4000-SW CD

2) RS -232 Cable with stereo style jack (this end plugs into the gauge)

3) RS -232 to USB adapter (with mini-CD) for newer computers that
only have USB ports. Refer to the instructions packaged with the
USB adapter to load the driver and operate the adapter.

4) Users manual

Refer to figure 1 to see how to connect the RS-232 cable to the Gauge.

Figure 1

2. Description

The gauge can log multiple sets of data, each of which is identified by
a sequential run number. Data logging runs are started and stopped
using new items inserted into the gauge's CONFIG menu sequence.
Logging parameters can be changed from one data logging run to the
next, and data logging runs may be as short as a single sample or as

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long as desired subject to the maximum storage capacity of the gauge.
The gauge can log pressure only for each sample, or it can log

pressure and temperature for each sample. This selection applies to
all runs and must be made prior to starting the first run.

When logging pressure only, the gauge has a capacity of 8500 data
records for storing run identification data and log sample data. Each
new data logging run requires 7 records for run identification overhead.
One record is required to log each sample, except for the triple value
case (average, minimum, maximum) where 3 records are required to
log each sample set.

Assuming a single run, the maximum capacity for all but the triple
value case is 8493 samples, and the maximum capacity for the triple
value case is 2831 sample sets.

When logging pressure and temperature, the gauge has a capacity of
5100 data records for storing run identification data and log sample
data. Each new data logging run requires 7 records for run
identification overhead. One record is required to log each sample,
except for the triple value case (average, minimum, maximum) where 3
records are required to log each sample set.

Assuming a single run, the maximum capacity for all but the triple
value case is 5093 samples, and the maximum capacity for the triple
value case is 1697 sample sets.

The interval time setting determines the frequency of sample
calculation and storage. Eleven discrete interval times are available,
ranging from 1 second to 1 hour.

A sample value is calculated at the end of each interval based on all of
the pressure measurements made during that interval. The sample
value may be the last measurement made in the interval, or it may be
the average, minimum, maximum, or median of all of the
measurements made during that interval.

A sample value may be stored for every interval during the run, only for
those intervals where the sample value exceeds a specified high or low
limit, or only for those intervals where the pressure differential during
the interval exceeds a maximum span.

The data logging function is disabled by default in all new gauges.
The DPG4000-SW application is used to enable and disable the data
log function in a gauge.

Two data logging modes are available, Download and Demand.
Multiple log runs are allowed in either mode, with the potential number
of runs dependent on the number of samples logged in each run and
the capacity of the gauge.

When the data logging mode is set to Download, the DPG4000-SW
application is used to enter or change the data logging parameters and

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send them to the gauge. The gauge remains in this mode until either
the DPG4000-SW application or the gauge 'CLEAr DATA' function is
used clear the logged data in the gauge, at which time the mode is set
to Demand. In Download mode none of the parameters may be
changed using the gauge menus and the downloaded values are
always used for each new log run. The DPG4000-SW application may
be used to change the logging parameters between runs without
affecting previously logged data stored in memory. The Download
mode data logging parameters are:

• Interval time selection:

- 1, 2, 5, 10, 30 seconds

- 1, 2, 5, 10, 30 minutes

- 1 hour

• Maximum number of samples to store per run. This may range from

1 to the full capacity of the gauge.

• Log type selection:

- Continuous. This is the most commonly used log type where a

sample is stored at every interval during the run. The sample
value stored is defined by the sample type selection below. The
run can be stopped manually, or stops automatically when the
log memory is full or the maximum number of samples per run is
logged.

- Trip high, where interval samples are stored during the run only

when the sample values exceed a high limit. Sample storage
starts when an interval's sample value becomes greater than the
trip setpoint, and continues at every interval until a subsequent
interval's sample value becomes less than the trip reset. Sample
storage then stops until a sample value again becomes greater
than the trip setpoint. The sample value stored, and used for
comparison, is defined by the sample type selection below. The
run can be stopped manually, or stops automatically when the
log memory is full or the maximum number of samples per run is
logged.

- Trip low, where interval samples are stored during the run only

when the sample values exceed a low limit. Sample storage
starts when an interval's sample value becomes less than the trip
setpoint, and continues at every interval until a subsequent
interval's sample value becomes greater than the trip reset.
Sample storage then stops until a sample value again becomes
less than the trip setpoint. The sample value stored, and used for
comparison, is defined by the sample type selection below. The
run can be stopped manually, or stops automatically when the
log memory is full or the maximum number of samples per run is
logged.

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- Trip Range, where interval samples are stored during the run

only when the pressure differential during the interval exceeds a
maximum span or range of values. Sample storage starts when
the difference between an interval's maximum and minimum
measurements becomes greater than the trip setpoint, and
continues at every interval until a subsequent interval's difference
becomes less than the trip reset. Sample storage then stops until
an interval's difference again becomes greater than the trip
setpoint. The run can be stopped manually, or stops
automatically when the log memory is full or the maximum
number of samples per run is logged.

• Sample type selection:

- Last measurement made in the sample interval.

- Average of all measurements made in the sample interval.

- Minimum of all measurements made in the sample interval.

- Maximum of all measurements made in the sample interval.

- Median of all the measurements made in the sample interval, the

midpoint between minimum to maximum measurements.

- Average, minimum, and maximum of all measurements made in

the sample interval. This requires 3 records of storage per
logged sample set and reduces capacity by a factor of 3.

• Log pressure unit selection. All supported pressure units including

custom.

• Trip setpoint expressed in log unit selection.

• Trip reset expressed in log unit selection.

• Log custom pressure unit factor.

When the data logging mode is set to the Demand mode the user can
set the gauge up to data log without the need to first connect it to the
computer. The gauge menus are used to enter and change some data
logging parameters, while the remaining parameters default to fixed
values. The gauge menus may be used to change the logging
parameters between runs without affecting previously logged data
stored in memory. The demand mode data logging parameters are:

• Interval time selection:

- 1, 2, 5, 10, 30 seconds

- 1, 2, 5, 10, 30 minutes

- 1 hour

• Maximum number of samples to log. This may range from 1 to the

full capacity of the gauge.

• Log type selection fixed at 'Continuous'.

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• Sample type selection fixed at 'Last measurement made in the

sample interval'.

• Log pressure unit selection. The unit is selected with the existing

configuration function before the log run is started.

• Trip setpoint not used.

• Trip reset not used.

• Log custom pressure unit factor. The factor is selected with the

existing configuration function before the log run is started

The gauge does not have real time clock capability, so the time stamp
on all samples in a run is elapsed days, hours, minutes and seconds
from run start. The DPG4000-SW application provides a feature for
relating each uploaded run start point to a real time base date and
time. When this feature is used, all uploaded elapsed time stamps in
the run are recalculated accordingly to get true time stamps of the form
year, month, day, hour, minute, second.

3. Gauge Operation

3.1 Data Logging Disabled

Until data logging functionality is enabled using the DPG4000-SW
application, the gauge operates as described in the user manual
received with the gauge. You must connect the gauge to the

DPG4000-SW software to enable the logging function. This is
true for both Demand and Download modes.

3.2 Download Mode

Once data logging functionality is enabled, a new item is inserted at
the start of the gauge configuration menu tree to direct the user to a
completely separate branch which contains all data logging functions.
This new menu item shows 'LOG' in the main display and 'DATA' in the
secondary display. Press the CONFIG key to proceed to the existing
configuration functions, or press the ENTER key to proceed to the new
data logging branch. The data logging configuration menu sequence
(new branch) is as follows:

1) Start or stop data logging

• Main display: LOG

• Secondary display: FULL if the log memory is full, OFF if not

logging data, else ON if logging data.

• the ▼ and ▲ keys are ignored if the log memory is FULL,

otherwise press either key to toggle between OFF and START if

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not logging data, or to toggle between ON and STOP if logging
data.

• press the CONFIG key to step to the next menu item.

• press the ENTER key to exit configuration if the display is FULL,

ON, or OFF, to stop logging and exit configuration if the display
is STOP, or to start logging and exit configuration if the display is
START.

2) Display number of free log records

• Main display: number of free records

• Secondary display: FREE

• the ▼ and ▲ keys are ignored.

• press the CONFIG key to step to the next menu item if not

logging, otherwise it exits configuration.

• press the ENTER key to exit configuration.

3) Erase all logged data and set to Demand mode

• Main display: CLEAr

• Secondary display: DATA

• the ▼ and ▲ keys are ignored.

• press the ENTER key to step to the next menu item and confirm

erasure.

• press the CONFIG to exit configuration without erasing the data.

4) Confirm erasure of all logged data and set to Demand
mode

• Main display: CLEAr

• Secondary display: CNFRM

• the ▼ and ▲ keys are ignored.

• press the ENTER key to erase the data, set Demand mode, and

exit configuration after briefly displaying CLr to confirm erasure.

• press the CONFIG key to exit configuration without erasing the

data.

While not logging data, the gauge operates as described in the user
manual received with the gauge.

When a log run is started, the pressure unit and custom factor are
forced to the downloaded selections. They are restored to their
original values at the end of the run.

While logging data, the following operating changes occur:

• Pressing the power button causes the log run to be stopped

before power is turned off.

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• Forced power off on low battery detection causes the log run to

be stopped before power is turned off.

• The zero key is active and an event record (including the change

in the zero offset value) is placed in the log.

• Auto off is disabled. It is restored to its original value at the end

of the run.

• The engineering units, damp, sample rate, tare, and custom

factor items on the existing configuration menu are disabled.

• The units field on the display cycles between the units, the text

LOG, and the text RUN at a rate of once per second. This
provides visual feedback that data logging is active, and the
number after the text RUN identifies the run number for later
reference.

3.3 Demand Mode

The Demand mode allows the user to conduct an impromptu data
measurement/log without the need of a computer to configure all of the
logging parameters.

Once data logging functionality is enabled, a new item is inserted at
the start of the configuration menu tree to direct the user to a
completely separate branch which contains all data logging functions.
This new menu item shows 'LOG' in the main display and 'DATA' in the
secondary display. Press the CONFIG key to proceed to the existing
configuration functions, or press the ENTER key to proceed to the new
data logging branch. The data logging configuration menu sequence
(new branch) is as follows:

1) Start or stop data logging

• Main display: LOG

• Secondary display: FULL if the log memory is full, OFF if not

logging data, else ON if logging data.

• the ▼ and ▲ keys are ignored if the log memory is FULL,

otherwise press either key to toggle between OFF and START if
not logging data, or to toggle between ON and STOP if logging
data.

• press the CONFIG key to step to the next menu item.

• press the ENTER key to exit configuration if the display is FULL,

ON, or OFF, to stop logging and exit configuration if the display
is STOP, or to start logging and exit configuration if the display is
START.

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