Dwyer DL7 User Manual

Bulletin E-90-DL7

INPUT JACK FOR INTERFACE CABLE

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SECURITY

EYELET

Series DL7 Differential Pressure Logger

Specifications - Installation and Operating Instructions

GENERAL

The Series DL7 Dataloggers are easy-to use battery-powered
data loggers that can monitor pressure and temperature. Each
unit can reliably record time-based data for later analysis, by
Trendreader software and any IBM PC or 100% compatible com­puter.

Series DL dataloggers run continuously--constantly measuring
and recording readings from any enabled channel. Self-powered
by a long life lithium battery that will provide years of reliable oper­ation, your logger can work independently from any external
power supply or computer. Each Series DL7 Datalogger has an
on-board thermistor that can be used to monitor and record ambi­ent temperature.

GENERAL INSTALLATION

The Trendreader software must be installed on your computer
prior to the use of any data logger described in this reference.
NOTE: The Series DL7 Differential Pressure Data Logger has
additional features not found on some of the other DL Series log­gers. This manual describes some of the unique features of the
DL7. For additional information on graph manipulation, custom
equations, modem setup, and sample rate tables, consult the
Trendreader software manual.

SETUP

To setup your datalogger you must first have Trendreader software
installed and running on your computer. You can then configure
your logger with various options by plugging into your computer
via the interface cable. From the Communicate menu, choose
Preferred Logger SR+. To access the logger window, double click
on the logger icon or click Communicate on the menu bar and
choose the highlighted Open COM from the menu.

PHYSICAL DATA

No. of Channels: Two; internal

thermistor, and a differential
pressure sensor.
Media: Dry air and noncorrosive
gases.
Max. Pressure Rating: 5x
rated pressure

Accuracy: ±0.05” w.c.
Resolution: ±0.01”w.c.
Nonlinearity: ±0.05% FS

(BFSL)

Hysteresis and Repeatability:

±0.05% FS.
Internal Thermistor Range: ­40 to 158°F (-40 to 70°C)

Internal Thermistor
Resolution: 0.7°F (0.4°C), R25

value equal to 10,000Ω [10kΩ @
25°C (77°F)]

Compensated Temp Range:

32 to 158°F (0 to 70°C)

Thermal Accuracy: ±0.5% FS.
Memory Size: 21,500 readings
Resolution: 12 bits (1 in 4096).
Stability: ±0.5% FS/yr.

Sampling Methods:

Continuous (First-out: not avail­able from 40 ms to 8 sec.), Stop
when full (Fill-then-stop), or
Delayed start.
Sampling Rates: Selectable
from 0.04 seconds to 8 hours.
Power: Built-in 3.6V Lithium
battery, 1 Amp-hour.
Power Consumption: 5-10 µA,
continuous.
Clock Accuracy: ±2 sec/day
plus one sampling interval.
Ambient Operating Temp: -40
to 158°F (-40 to 70°C), 0 to
95% RH, non-condensing.
Connection: Two 1/8’ I.D. per­manent protective tubing.
Computer Requirements: IBM
compatible 386 or above and
Windows™ 3.1 or later with
2mB RAM and 2mB hard drive
disk space, one serial port.

Housing: Noryl™
Weight: 4 oz (110 g).

EQUATION #

Model

Number

DL70 ±0.5˝ w.c. (1.2 mbar) 13
DL71 ±1˝ w.c. (2.5 mbar) 13
DL72 ±2.5˝ w.c. (6.2 mbar) 88
DL75 ±5˝ w.c. (12.4 mbar) 37

DL710 ±10˝ w.c.(24.9 mbar) 37

Pressure Range Equation #

TABLE 1

DWYER INSTRUMENTS, INC.

P.O. Box 373 • Michigan City, IN 46361-0373, U.S.A. Fax: [phone] e-mail: [e-mail]

Phone: [phone] www.dwyer-inst.com

If more than one logger icon appears on the screen or more than
one Open COM is highlighted on the Communicate menu, this
means you have more than one COM port available on your
computer. Choose the port that the particular logger is connect­ed to.

The logger window will display the serial number of the logger
Trendreader software is communicating with. See Figure 1. To
contact another logger connected to the compuet. 1. Double­click the serial number displayed to highlight it. 2. Type the serial
number of the logger you want to contact. 3. Click the Contact
button.

FIGURE 1

Filename

You cannot name the file during setup. Name the file when you
are backing up the logger.

Current Time

Make sure the current time is correct. To change the time,
access the Program manager on your computer and follow
instructions in your computer setup manual.

Stop When Full Continuous Mode

The logger can be set to stop taking readings when the memory
is full, or to continue to take readings when the memory is full.
To choose the first option, click the box in front of Stop When
Full so that there is an “X” in it. To choose the continuous mode,
click the box in front of Stop When Full so there is no “X” in it.
The logger will continue to take readings when the memory is
full, discarding the oldest reading as it records new readings.

Stopping Realtime

When the logger window is opened, the logger is operating in
realtime mode, which means current readings are being dis­played in the window. Before changing any settings, click Edit
Setup.

Enabling and Disabling Channels

Enabling a channel activates that channel and it will continually
record and store readings in memory. In the channel ON col­umn, Yes means the channel is active, No means it is not. Click
on the channel being changed to toggle between yes and no.
Disable any channels not required to conserve memory space.

Equation Numbers

Equations are calculations the software uses to convert raw log­ger data to understandable units. Refer to page one (Table 1) for
the appropriate equation number.

To see a list of standard equations available, double click one of
the equation numbers in the Eqn column. The Select an
Equation dialog box will appear, enabling you to scroll through
the standard equations. If you want to choose one of the equa­tions on the list, click it to highlight, and click Accept (or Enter).
You can also choose an equation by typing the number in the
selected Equation Number box and clicking Accept (or Enter).

Custom equations can be created and assigned to specific log­ger channels. For additional information on creating custom
equations, please refer to the instruction manual included with
the Trendreader software.

Calibrations

The calibration values displayed in the low, med, high columns
are factory set and match the sensor supplied.

Viewing Realtime Readings

The realtime function allows the user to view measurements as
they are being recorded. Viewing current readings can be useful
when monitoring remote loggers by modem. In realtime mode,
the logger reads and displays the variable every 8 seconds. If
the sample rate is greater than 8-seconds, the average value for
the sample interval is stored (based on 8-second readings).

Do not leave realtime running if you want to perform other tasks
in Trendreader or if you want to switch to another Windows
application. The operation of Trendreader of other Windows pro­gram will be slowed considerably with realtime funning. To stop
or start realtime, click the Edit Setup button. Stopping realtime
has no effect on the logger’s information gathering.

Units of Measure

The units of measure can be changed to fit your particular
needs. To change the units displayed in Realtime and on the
logged data choose the Options menu, hightlight Units, and
highlight the parameter being measured. The units appropriate
for that particular parameter will be displayed in the units win­dow. Select the box corresponding to the desired units of mea­sure and press Enter.

Clearing Stored Data

To empty stored data, click Clear Stored Data.

When viewing in realtime, the new units will be displayed at the
next update interval. The standard unit of measure will be desig­nated with a 1 in the Scale column. When selecting a different
unit of measure, make sure the conversion from the standard is
correct.

FAST READ MODE

Choose Fast Read Mode when:

1. You need a sample rate of less than 8-seconds, and /or

2. You want to delay the logger’s start time but do not want to
specify the start time until after the logger has been setup.

Choosing a Sample Rate

The sample rate is the frequency that the logger takes readings.
The current sample rate is always displayed. to change the sam­ple rate: 1. Click the current rate. The sample rate dialog box
appears. The dialog box displays current sample rate, the num­ber of active channels, and the length of time it will take to fill the
memory using the number of active channels and rate. (To
determine the loggers capacity, enable the number of channels
required before choosing a sample rate). 2. Click the down
arrow to see available sample rates from 8 seconds to 8 hours in
Continuous and Stop When Full modes. Scroll if necessary, and
click on the desired rate. In Fast Read mode, sample rates less
than 8 seconds are available. 3. Click Accept. The new sample
rate will apply to all active channels. If you do not want to
change the sample rate, click cancel.

Delaying Starting Time

Make sure the correct time is displayed in the logger window
before using this function. Once the logger has been setup, click
Save Setup, and the logger will start gathering data. To delay
the start time: 1. Double click in the Start Delay box to open the
Select a Time dialog box. 2. Set the time and/or date for the
logger to start taking readings. 3. Click Accept. The logger can
be set for a delayed start time of up to two years.

Number of Readings

The maximum number of readings the DL7 logger can store is
21,500. If fewer readings are desired, change the number (in
increments of 500).

Fast Read Mode allows you to choose sample rates from 0.04
seconds (25 readings per second) to 2 minutes. The sample
rate must be in increments of 0.04 seconds. NOTE: A separate
power source is required when using Fast Read Mode. Power
can be supplied from the computer the logger is connected to or
a separate battery pack (BP-100). If using the battery pack, the
logger will start taking reading as soon as the battery is connect­ed.

The logger cannot work in continuous Mode when using Fast
Read Mode. The logger will stop taking readings as soon as the
memory is full. The logger will also interrupt readings when it is
connected to Trendreader software.

To delay start in Fast Read Mode:

1. Set the delay time in seconds in the start Delay box. Use this
method when the logger will remain connected to a computer or
battery pack.

2. If the battery pack will be connected at a later time, follow this
procedure before disconnecting the logger from the computer:
Before clicking Save Setup, set Start Delay for long enough that
you can save the setup and disconnect the logger while it is
asleep. The logger must be asleep (on start delay) when it is dis­connected to be able to start taking readings when the battery is
connected to it. NOTE: You must set a minimum start delay of
16 seconds before you disconnect the logger from the computer.
the logger must be disconnected from the computer within 8­seconds of setting the delay. If these steps are omitted, the log­ger will not start when the battery is connected.

To calculate the number of readings a particular time span will
need, divide the time span by the sample rate (making sure both
are in seconds or minutes). If you are taking readings at 8-sec­ond intervals for 24-hours, and need to know the number of
readings, convert 24-hours to seconds (86400) and divide by the
sample rate of 8-seconds to get 10,800 readings. When back­ing up the logger, it will stop at the specified number of readings.

Saving Changes

When you have finished setting up your logger, click Save Setup.
A dialog box will appear asking to clear the logger and save
setup. (Setting up a logger erases all the previously gathered
data). Click OK.

Do not contact a logger in Fast Read Mode until you are going to
back it up. Contacting the logger will stop it from taking read­ings. You can contact a logger by clicking Contact or by open­ing the window once it has been closed.

BACKING UP A LOGGER

Copying data from a logger to your computer requires an IC-100
or IC-200 Interface cable. to backup a single logger use the IC­100 Interface Module. The IC-200 Interface Module can be used
to backup several loggers. Backing up a logger can take a num­ber of minutes depending on the speed of your computer and
the amount of data being transferred.