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The Dryden Aqua DIN rail mounted single oxygen
transmitter will accept an input directly from our Oxygen Probes. If
you want to display and alarm for both oxygen and temperature (PT100
sensors) then two transmitters will be required. The
transmitter can then send the value back out as a voltage ( e.g. 0 to 10v)
or analogue out-put, (0 to 20mamps, or 4 to 20mamps). There are also
two programmable relay out-puts and a display.
The transmitters are provided with a clip
on front display which is used to program the transmitter for different
functions. The display gives the raw data out-put from the oxygen probe.
It is useful to display the raw data, especially if you are using PLC based
systems. The display can also be used to calibrated the unit to display the
data as dissolved oxygen ( units will be shown as mv). This makes for a very low cost multi-channel
dissolved oxygen monitor.
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Electrical connections 
Transmitter connections
- Check the mv out-put from the oxygen probe,
with the probe in air the reading will be approx 80mv +/- 30mv
- Connect the Dryden dissolved oxygen probe to
terminals 42 ( blue wire from oxygen probe) and 44 ( brown wire from
oxygen probe (red if a PT100 oxygen probe))
- Connect the power supply to 31 and 33. The
input power supply voltage is Universal, the transmitter will accept 20 to
240v ac or dc supply, 50 to 60 Hz. Insure
that the power supply is isolated while you make the electrical
connections, especially if a high voltage is used to power up the
equipment. Once the electrically connections are in place, and
electrically safe, you may turn on the power to the transmitter
Programming
You will need to set up each transmitter to read
oxygen levels as follows;
- Turn the power supply ON
- The display will flash SE.BR
- Press the OK button twice to display NO (Adv Set),
press OK again followed by the UP arrow key until VOLT (In-type) is
displayed. Press OK to accept.
- Use the UP arrow key to scroll through the Volt in
ranges, select Volt 0 to 1 and press OK
- The unit will now ask you what units to display,
press the down arrow key to select the unit type, select mV ( milli volts)
and press OK
- Decimal point selection, the unit will
display 111.1, press OK to accept the default value.
- The display now reads DISP (lo) The display
low value is zero by default, press OK to accept ( see addition note
(a) below) The Display high will be 100mv by default. Press the up
arrow key until it reads 200mv, then press OK to accept. The unit is
now scaled between 0mv and 200mv. See note below about changing the units
to display mg/l of Dissolved Oxygen, note (b) or %sat note (c)
- The relay out puts R1 & R2 can now be set, set
relays in DISP mode, if you have set the unit to display in mg/l,
then the value DISPlayed for the relay set points will related the mg/l of
dissolved oxygen or %sat.
- The action of the relays is displayed in the third
line of the transmitter. You can set the action of the relay on an
increasing or decreasing value, you can set the hysetresis and the on off
time in seconds. Once you have set the relays, your will then be asked to
set the analogue out-put.
- Select the Out-put you want from the transmitter by
pressing the UP arrow key. Normally it will be a CURR current analogue
out-put between 0 and 20mV or 4 to 20mV. The transmitter also permits a
voltage analogue out-put. Press OK to accept the analogue out-put.
Calibration
- The unit now needs to be calibrated. You will
need an accurate calibration source which gives 10mv to 200mv.
However if you do not have an accurate mv calibration source, you
may use an accurate mV meter and measure the out-put from a Dryden Oxygen
probe. The mV out-put from the probe will be around 90mv with the
probe suspended in air at a temperature of 20 deg C. Do not move or
touch the probe during a calibration, keep out of direct sunlight, see
note (b) for additional information. Connect the probe the
transmitter, and measure the mV across terminal 42 and 44. Press OK to
show NO Adva Set and press the up arrow key to change to YES Adv Set then
OK to accept.
- Press the up arrow key to show Cal set-up and
press OK
- The display shows No Cal lo, press OK. The display
now show No Cal Hi, press the up arrow key to change to YES Cal Hi and
then OK to accept. Enter the mv value for the oxygen probe or the
mg/l value for dissolved oxygen ( see note (b)., press OK to accept.
- No User Cal is now displayed, press the up arrow
key to change to Yes User Cal and press OK to accept. The unit will
now display the value from the probe, displayed as mV. If you want the
value to be displayed at mg/l dissolved oxygen go to Note (b) below, or
for percentage saturation go to note (c)
Notes
(a) If you press yes for DISP (low) or YES for Cal lo, the
transmitter will use the mv value of the source connected to the
transmitter. If an oxygen probe is connected then the value set at Low
will become the same as the probe out-put which will be around 90mv.
This will not allow the transmitter to work. To calibrate to Low value,
disconnect he oxygen probe and place a wire loop between inputs 42 & 44. On
the transmitter go to Cal (low) select YES and press OK to calibrate the
unit to 0mv input. Select No for Cal high value. Remove the wire
between 42 & 44 and start again with the calibration.
(b) To display Dissolved Oxygen as mg/l on the
transmitter, set the Display Scale from 0 to 20 (mv) as opposed to 0 to
200 (mv). Next enter the Adv Set-up and go to Cal (Hi) and enter the
dissolved oxygen value at the Oxygen probe. You can obtain this value
from the Tables by doing a standard calibration of our dissolved oxygen
probe ( click
hear for Calibration procedure), or you can use an accurate portable
dissolved oxygen meter to measure the oxygen reading at the probe, and then
simply enter this value in mg/l into the transmitter. Please note that the
transmitter will display the reading in the units specified, e.g mv,
however the value will equate with mg/l of oxygen. Then select YES for
use CAL (c) In order to display the reading in percentage
saturation %sat, please order %sat membranes for the probe. By default we
will always supply mg/l membranes. Set the Display Scale to 0 to 200 (mv).
Next enter the Adv Set-up and go to Cal (Hi) and enter the dissolved oxygen
value at the Oxygen probe. If you are calibrating the probe in air,
simply suspended the probe in air ( out of direct sunlight) for at least 30
minutes, you van then assume that this value is equal to 100% sat, then
simply enter this value into the transmitter. Alternatively you may
suspended to probe in a small tank of strongly aerated water, again you are
making the assumption that the water is 100% saturated with oxygen. |
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Electrical connections
Please note that the transmitter will only accept one
input, if you are using a pt100 oxygen probe and you wish to monitor and
display both oxygen and temperature, you will require two transmitters per
probe.
Oxygen probe with pt100 sensor
- 1 +ve dissolved
oxygen ( red)
- 2 -ve dissolved
oxygen connection ( blue)
- 3 connected to the
other side of the PT100 ( black)
- 4 & 5 joined together on one side of the PT100 ( green
& yellow)
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 The
Dryden Aqua oxygen probe with Temp sensors type PT100
- Connect the Dryden dissolved oxygen probe to
terminals 42 ( blue wire from oxygen probe) and 44 ( red wire from
oxygen probe), on a second transmitter you can now connect the temperature
sensor.
- Connect PT 100 wire ( wire 3 black onto 43),
wire 4 green onto 41, wire 5 yellow onto 42.
- Connect the power supply to 31 and 33. The
input power supply voltage is Universal, the transmitter will accept 20v
to 240v ac or dc supply, 50 to 60 Hz. Insure that the power supply
is isolated while you make the electrical connections, especially if a
high voltage is used to power up the equipment. Once the electrically
connections are in place, and electrically safe, you may turn on the power
to the transmitter
Programming
- Turn the power supply ON
- The transmitter will automatically detect the probe
and display the temperature in Deg C. The alarm relay set points,
hysteresis and analogue out-puts can not be set from the display module.
Program steps for temperature, also check out the pdf
manual
Click here for manual
- 1. press OK "NOadv set" is now displayed, press OK
to select
- 2. The input type is now display , press up arrow
key to select temp then press OK
- 3. Press up arrow key to select type of temp
sensor, select PT, then select PT100, then select 3 Wire, then select DegC
or Deg F
- 4. Setup R1 function, relay out-put 1, press OK to
select, then use up arrow key to select normally open or normally closed
action.
- 5. R1 set temperature is down displayed, the
default is 50 degC, you can now change the value by using the up / down
arrow key.press OK to select the temp
- 6. You now have an option to set the relay to
activate on an increasing INCR or decreasing DECR temperature, press OK to
select
- 7. You now have the option to set the hysteresis or
"dead band" around the switching point. the default is 1 deg C, it can be
changed in 0.1 deg c increments.
- 8. You can now set the error action, the default
condition is NONE
- 9. You can now select the on or off relay delay
time in seconds, the default is zero secods.
- 10 Relay 2, R2 is now displayed, repeat the above
the set Relay No 2.
- 11. Analogue out-put is now displayed, you can now
select a voltage or mv output, press OK to select.
- 12. The display will now program the transmitter,
and then display the temp value. If you do not need to see the
temperature, you can now remove the transmitter and use it the program the
next unit.
We are working on sorting out the display on the
transmitter to give as units of mg/l and %sat, for the time being the units
will be displayed as mv |
