Delta DO 9704 User Manual

DO 9704

INSTRUCTIONS MANUAL

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DO 9704

67

DO 9704

PRESSURE AND TEMPERATURE - DATA-LOGGER

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1 Input A, DIN 8-pole connector for pressure, flow rate or temperature.
2 Display.
3 Negative symbol input A.
4 HOLD symbol.
5Hsymbol: flashes during RECORD function, permanently lit if the battery is running low.
6 Negative symbol input B.
7 The display shows the Mean values.
8 REL symbol, indicates that the instrument is making a relative measurement.
9 Memory/Serial Out. Fixed symbol: the instrument is storing. Flashing symbol: serial output is

enabled.

10 Measurement units that may be selected at input A.
11 Measurement unit selected at input A.
12 HOLD key for blocking the reading.
13 REL key, the value shown is related to the indication at the moment in which the REL key was

pressed.

14 A-B key. The instrument displays the difference between the inputs.
15 Unit A: Key for selecting the measurement unit for input A.
16 Serial Output: enables unloading of data at the RS 232C serial output.
17 Prog: this key is pressed to enter the routine for programming the various functions of the

instrument.

18skey. When enabled, this key increases the displayed parameter.
19 Output for RS 232C (SUB D male 9-pole).
20 Input B, DIN 8-pole connector for pressure, flow rate or temperature.
21 Input A indication.
22 Multiplication channel for channel A 10

3

.

23 Multiplication channel for channel A 10

–3

.

24 Input B indication.
25 Multiplication channel for channel B 10

3

.

26 Multiplication channel for channel B 10

–3

.

27 The display shows the Maximum values.
28 The display shows the difference in value between inputs A or B.
29 The display shows the Minimum values.
30 Measurement units that may be selected at input B.
31 Measurement unit selected at input B.
32 Key for switching the instrument on and off.
33 Unit B. Key for selecting the measurement unit for input B.
34 When pressed in sequence, the display indicates the Maximum peak value, the Minimum value

and the Mean value.

35 The key has various functions: it starts and stops storage, confirms the set parameters.
36tkey. When enabled, this key decreases the displayed values, starts and stops the RECORD

function.

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INTRODUCTION

The DELTA OHM DO 9704 pressure gauge and data logger has been designed for detecting pres-
sure, flow rate and temperature, physical values which are very important in industrial and chemical
processes.
The instrument has two inputs, A and B, and automatically recognises the probes connected,
whether they be pressure or temperature probes or turbines for measuring flow rate, and displays
the difference between the two inputs.
As the probes are interchangeable, it is possible to choose the most suitable combination for all
applications without having to recalibrate the instrument. The operating principle of the pressure
sensor is based on the bending of a membrane in a watertight chamber in contact with the flow of
which you want to measure the pressure. The flow may be liquid or gas. The flow rate measure­ment is based on the number of impulses or the frequency of a small fan.
The DO 9704 is able to measure differential or relative pressure for air or non corrosive gases,
absolute and relative pressure for measurements in contact with liquids or gases, in 6 different
measurement units; temperature (in °C or °F); flow rate in the range for 2 to 2000 litres/minute with
a turbine in the measurement units LPM (litres per minute) or IGPM (Imperial Gallons per Minute).

The instrument’s Data Logger function enables it to store up to 30,000 readings. The sampling
period is variable from 1 second to 12 hours.
The data acquired may later be transferred to a Personal Computer or a printer by means of the
opto-insulated serial line RS 232C. For each value stored the date and time of acquisition are indi­cated; each acquisition block is ended with a report which provides the maximum (peak), minimum
and mean values

With the Serial Output function it is possible to obtain the instantaneous values measured by the
instrument at the output of the serial line RS 232C, in order to send them to a printer or a computer.

Other functions such as HOLD (which blocks the display), REL (for taking relative measurements)
and RECORD (for storing the maximum, minimum and mean values) further enrich the instrument’s
performance.

Thanks to its versatility and to its storage capacity, the instrument is particularly suitable for pressu­re measurements in hydraulics, fluidodynamics, in chemical plants and process controls, in pum­ping plants; it is also useful in particular sectors such as moulding and presses for plastics and
thermosetting materials, chimney draught, compressors; it may also be used for flow rate and level
measurements.

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70

ON/OFF

HOLD + ON/OFF

HOLD

ON/OFF key. Press this key
repeatedly to switch the instru­ment on or off.
The instrument has a cut-out
system (Auto Power Off) which
switches off automatically after
about 8 minutes.

HOLD and ON/OFF key. If this
key is pressed and held down
together with the ON/OFF key
while switching on, for the dura­tion of the switching-on routine,
the self cut-out function (Auto
Power Off) is disactivated.
The battery symbol flashes at a
frequency of 1 Hz.
The instrument can be switched
off only by pressing the ON/OFF
key.

When this key is pressed during
normal operation the value shown
on the display is frozen and the
HOLD symbol lights up; updating
of the internal data continues.
When the key is pressed for the
second time the instrument
returns to normal operation and
the HOLD symbol goes off.

All the symbols are lit for a few
seconds after pressing the
ON/OFF key.
Complete display.

The Hsymbol flashes to indicate
that Auto Power Off is disabled.

KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

KEYBOARD

+

REL

UNIT A

UNIT B

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

The REL key allows you to
display or store relative values or
send them immediately onto the
serial line.
The values for comparison are
stored at the precise moment in
which the key is pressed.
Data may be stored when the
REL button is active.
After data has been sent onto the
serial line, in immediate or remote
mode from the instrument’s inter­nal memory, obtained with the
REL function active, a report will
be provided giving the maximum,
minimum and mean relative
values and the reference values
on which the calculation of the
relative values was based.

When the Unit A key is pressed,
input A, any of the following mea­surement units may be chosen:
kPa, bar, mmHg, atm, mmH2O,
psi, l/m, IGPM. The led corre­sponding to the unit chosen lights
up. The indication at the top of the
display corresponds to input A.

When the Unit B key is pressed,
input B, any of the following mea­surement units may be chosen:
kPa, bar, mmHg, atm, mmH2O,
psi, l/m, IGPM. The led corre­sponding to the unit chosen lights
up. The indication at the top of the
display corresponds to input B.

REL

3

10

3

10

A-B

SERIAL OUTPUT

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

Pressing A-B obtains the differen­ce between the values indicated
for input A minus the values of
input B. The full-scale value of

the two probes must be the
same and they must be opera­ting with the same measure­ment units, otherwise an ERR
message is given. The value of

the difference appears at the bot­tom of the display.

Serial Output key. The Serial
Output key sends the data being
acquired onto the serial line
immediately, according to the set
programming parameters. The
Serial Out symbol flashes.

Note:

The choice of the Baud Rate
influences the speed at which the
data are sent onto the serial line.
With a data transmission speed of
300 Baud (the character being
composed of 10 bit: 1 start bit + 8
character bit + 1 stop bit), the time
taken to send 80 characters on
the serial line is: 80 / (300/10) =

2.7 sec.

Serial

Out

Memory

3

10

3

10

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

P0+

+

+

There is therefore a limit on the
minimum time that may be set as
a function of the Baud Rate cho­sen:

- P0 -

When ENTER is pressed with P0
on the display, the instrument
returns to normal operating mode
without storing any parameter.
Press the PROG key to move on
to step P1.

When the skey is pressed with
P0 on the channel A display it
resets the offset of the connected
probe (only for probes for relati-

ve or differential measure­ments).

When the tkey is pressed with
P0 on the channel B display it
resets the offset of the connected
probe (only for probes for relati-

ve or differential measure­ments).

BAUD
RATE

300 Baud
600 Baud

> 600 Baud

MINIMUM

SETTABLE

TIME

4 sec.
2 sec.
1 sec.

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

P1+ = data dump

- P1 -

When ENTER is pressed with P1
on the display, the data stored in
the memory of the instrument are
unloaded (DUMP); press the
PROG key to move on to step P2.
During data dumping the messa­ge P1 appears on the upper
display of the instrument. At the
end the instrument automatically
returns to normal operating mode.

The unloading of data from the
instrument memory may be
momentarily stopped by pressing
the ENTER key. Press the
ENTER key again to reactivate
data unloading.
When the PROG key is pressed,
data unloading is finally conclu­ded.
At the end of each block the
report is sent with the maximum
(peak), minimum and mean
values calculated on the block.
During the DUMP phase the
instrument does not switch off
automatically, all the key functions
are disabled except the ENTER,
PROG and ON/OFF keys.

Note:

The block is defined at the
moment of storage as a group of
consecutive recordings. The first
interruption of storage ends and
determines the block.

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

When the skey (MEMORY
CLEAR sub-function) is pressed
with P1 on the display, all the sto­red data are erased.
The instrument will display the
message P1. At the end the
instrument automatically returns
to normal operating mode.

- P2 -

When ENTER is pressed with P2
on the display, the storage time
parameter may be modified.
This parameter is used for the fol­lowing two functions:

1. Logging time, or time elapsing
between two consecutive data
storages in the internal memory
of the instrument.

2. Data dump interval, or time ela­psing between two immediate
data dumps on the serial line.

The sand tkeys are used to
define the desired intervention
time.
At bottom right of the display the
instrument indicates the seconds
(1 - 59).
At top right of the display the
instrument indicates the minutes
(1 - 59).
At top left of the display the instru­ment indicates the hours (1 - 12).

P1+ = erase memory

storage

P2+ = interval

programming

hours minutes

seconds

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

After defining the storage time,
press ENTER to return to normal
operation, or press the PROG key
to move on to step P3.

In the storage function the instru­ment is able to store more than
30,000 acquisitions.
The indicative time taken to fill the
memory completely is a function
of the recording interval and may
be obtained from the following
table:

Once the memory has been filled
the instrument automatically stops
and quits storage status. The fla­shing FUL message appears. The
instrument switches off after 8
minutes.

RECORDING INTERVAL

1 sec
1 min

1 hour

TIME TO FILL

THE MEMORY

8 hours
20 days

1250 days

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

P3+ = set Baud Rate

P4+ = set year

- P3 -

When ENTER is pressed with P3
on the display, the Baud Rate of
the RS 232C serial transmission
may be modified.
The sand tkeys are used to
select the desired value.
The possible values are:

19.2 = 19200 Baud

9.6 = 9600 Baud

4.8 = 4800 Baud

2.4 = 2400 Baud

1.2 = 1200 Baud

0.6 = 600 Baud

0.3 = 300 Baud

Finally press ENTER to return to
normal operation, or press the
PROG key to move on to step P4.

- P4 -

When ENTER is pressed with P4
on the display, the year value may
be set or changed.
The sand tkeys are used to
select the desired year.
Then press PROG to move on to
step P5 (the ENTER key is not
active).

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

P5+ = set month

P6+ = set day

- P5 -

When ENTER is pressed with P5
on the display, the month may be
set or changed..
The sand tkeys are used to
select the desired month.
Then press PROG to move on to
step P6 (the ENTER key is not
active).

- P6 -

When ENTER is pressed with P6
on the display, the day may be set
or changed.
The sand tkeys are used to
select the desired day.
Then press PROG to move on to
step P7 (the ENTER key is not
active).

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

P7+ = set hours

P8+ = set minutes

- P7 -

When ENTER is pressed with P7
on the display, the hour may be
set or changed.
The sand tkeys are used to
select the desired hour.
Then press PROG to move on to
step P8 (the ENTER key is not
active).

- P8 -

When ENTER is pressed with P8
on the display, the minutes may
be set or changed.
The sand tkeys are used to
select the desired minutes.
Then press ENTER to return to
normal operating mode or PROG
to move on to step P9, without
updating the internal clock.

Quitting with the ENTER key
updates the internal clock with
the date and time just set, set­ting the seconds at zero at the
time of quitting.

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

P9+ =

enable/disable
self cut-out

- P9 -

When ENTER is pressed with P9
on the display, the instrument
enters the program which enables
or disables the self cut-out func­tion when it is in storage mode
and with a set storage interval
higher than or equal to 1 minute.

The sand tkeys are used to
select the value 00 or 01.
00 With a set storage interval

lower than 1 minute, the
instrument does not switch off
automatically; it always
remains lit.
When the ON/OFF key is
pressed, storage stops and
the instrument switches off.

00 With a set storage interval

higher than 1 minute, the
display switches off automati­cally after about 8 minutes. At
each set storage interval there
is a beep and the display swit­ches on for a few seconds..
The display can be switched
on or off by pressing the
ON/OFF key. The instrument
keeps on storing if you keep it
switched on. The display swit­ches off automatically after
about 8 minutes.
To stop storage, press the
ON/OFF key (if the instrument
is off). Press the ENTER key.

01 With a set storage interval

lower than 1 minute, the
instrument does not switch off

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

P10+ =

select type
of printing

automatically.
When the ON/OFF key is
pressed, storage is interrupted
and the instrument switches
off.

01 With a set storage interval

higher than 1 minute, the
display does not switch off
automatically; it remains
always lit and goes on storing.
When the ON/OFF key is
pressed the display stops till
the next acquisition. Then it
switches on again and
remains lit.
To stop storage, press the
ENTER key.

The ENTER key is used to return
to normal operating mode, while
pressing the PROG key moves on
to step P10.

- P10 -

When ENTER is pressed with
P10 on the display it is possible to
select complete or reduced data
printing.

The sand tkeys are used to
select the desired printing format.
01: complete printing
00: reduced printing
The ENTER key is used to return
to normal operating mode, while
pressing the PROG key moves on
to step P11.

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KEY

SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

DATA CALL

P11+

- P11 -

When ENTER is pressed with
P11 on the display, the instrument
enters the program for calibrating
the instrument.

DATA CALL key (Mean - Max ­Min).
When the DATA CALL key is
pressed repeatedly, the Max
(Peak), Min and Mean values
measured for both measuring
channels are shown on the
display.

s

key. When enabled it increases

the values, in function P0 it

resets the probe offset of chan­nel A (only for relative or differen-

tial probes), with P1 it enables the
memory clear function.

ENTER key (Start-Stop sub-func­tion).
The ENTER key is used alternati­vely to start or stop storage of a
new block of data to be kept in the
memory of the instrument. Data
storage is performed at the rate
set during programming of step
P2.
The data stored between one
start and the following stop form a
block.

+ Start-Stop

3

10

3

10

3

3

10

10

3

10

3

10

MIN

3

10

3

10

Memory

MAX

MED

Serial

Out

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

Different blocks can thus be for­med, all ending (during unloading)
with the report giving the maxi­mum, minimum and mean values.

The Serial Out/Memory symbol
remains lit for the whole storage
period. The Auto Power Off func­tion is active and the instrument
switches itself off after about 8
minutes of inactivity. It is restarted
automatically by the clock inter­rupt control which reactivates the
instrument for only the time nee­ded for all the acquisition and sto­rage operations. Once this has
been done the instrument swit­ches itself off again.
During this phase the instrument
appears to be off, but it is active in
operating mode.
If the Serial Out/Memory symbol
lights up when switching on the
instrument with the ON/OFF key,
this means that the instrument
was in storage status.
In this stage the Serial Out and
PROG keys are not enabled.
When this operative mode
is disactivated the Serial
Out/Memory symbol is not lit.

The total memory capacity availa­ble is 512 kbyte, with the possibi­lity of storing more than 30,000
readings.

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

ENTER

with RCD

During programming this key is
used both to enter the desired
program and to confirm the value
of the parameter considered.

When pressed repeatedly, the

t

key, sub-function RCD, starts and
stops the record function, which
calculates and stores the maxi­mum, minimum and mean values.

When the RCD key is held down
the instrument emits a short beep
followed by a long one. This con­firms that the max., min. and
mean values stored previously
are being erased from the
memory and a new series of
recordings is started which will be
used as the basis on which to cal­culate and store new max., min.
and mean values
After resetting of the max., min.
and mean values, the RCD func­tion has a duration of about
30,000 readings, that is about 4
hours. At the end, the RCD func­tion is automatically interrupted
and the max. min. and mean
values calculated up till then are
maintained.
During RCD mode the Auto
Power Off function is disabled and
the battery symbol flashes at a
frequency of 2 Hz.

Attention:

If the battery symbol does not fla-

10

3

3

10

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KEY SIMBOLS LIT BESIDES

THE NUMBERS

FUNCTION

DESCRIPTION

sh at a frequency of 2 Hz when
the RCD key is pressed, it means
that the RCD function has stored
more than 30,000 acquisitions
and cannot continue any further.
After having taken note of the
max. min. and mean values calcu­lated up till then, reset the RCD
function and restart it.

t

key. During programming or
calibration, this key is used to
decrease the value of the para­meter being considered. In func-

tion P0 it resets the probe off­set of channel B (only for relative

or differential probes).