Loligo Systems OXY-REG Oxygen Analyzer and Regulator System User Manual

OXY-REG Oxygen Analyzer and Regulator System
User Manual

OXY-REG with DO-SET (optional) Oxygen Analyzer and Regulator System
User manual version 2.4.1

The OXY-REG system is used for monitoring and regulating dissolved oxygen content of sea or fresh water in fish tanks, respirometers, aquaria etc.

LIST OF PARTS

1. Controller instrument
2. Data cable
3. MINI-DO galvanic cell oxygen probe
4. Maintenance kit for O2 probe
5. Membrane tool 6) Power cord
6. Converter piece
7. User manual
8. DO-SET (OPTIONAL)
   – Solenoid valve with w/push-in fittings
   – PU tubing – Air stone

SETUP

Connect the MINI-DO galvanic oxygen probe to the input labeled IN on the front side of the OXY-REG instrument. Now connect the power cord to the input labeled POWER on the backside of the OXY-REG instrument. The OXY-REG will now turn on and start reading oxygen values. There are two relays on the backside of the instrument which can be used to control the activity of a solenoid valve to regulate oxygen saturation in the water. Also, there is a button labeled 0-cal, this button is used for zero calibration only.

CONFIGURATION / OPERATING THE FUNCTION KEYS

The OXY-REG is a menu-driven instrument. The front panel has three buttons for operation, e.g. two arrow buttons ( ∧ and ∨ ) and one OK button. Use these three buttons to scroll through the menu and accept instrument settings. For each menu there is a scrolling help text which is automatically shown in the display, this starts after five seconds if no key has been activated. Use the menu to calibrate the oxygen probe, and set relay action and level of control.
∧ will increase the numerical value or choose the next parameter.
V will decrease the numerical value or choose the previous parameter.
OK will accept the chosen value and end the menu.
To summarize, the ∧ and ∨ buttons are used to toggle between options. The OK button is used to accept settings and go to the next option. Press and hold the OK button for 0.5 seconds, to get the last option available. Once the entire configuration has been entered, the display will show “—-“.
The following two pages show the complete menu routing diagram and scrolling help texts.
NB! Please note that the OXY-REG is password protected. The Password is 1234. The OXY-REG is calibrated from Loligo Systems to the MINI-DO. The RE1 is set to act on a decreasing signal, the RE2 is set to act on an increasing signal. Use the fast set point adjustment to adjust the set point.

FAST SET POINT ADJUSTMENT

It is possible to quickly change set point values without having to scroll through the whole instrument menu.
With the instrument turned on, press the button once. Now choose relay 1 (or 2), and press the OK button. Then change the set point value using the arrow buttons. Finish by pressing the OK button.
Test relay functions, by pressing both arrow buttons simultaneously. The LED diode will toggle its state. When done, press the OK button several times until the display reads “—-“.

SCROLLING HELP TEXT

CALIBRATING THE OXYGEN PROBE

A galvanic type oxygen probe is stable and quite rugged, but it sometimes needs re-calibration like all other oxygen sensors in order to adjust for signal drift.
Standard two-point calibration procedure

1. Connect the probe to the oxygen instrument and turn on the instrument.

2. Place the tip of the probe in a mixed air-equilibrated water sample. This can be achieved by purging atmospheric air into sample water, e.g. with an air pump and air stone.

3. Wait for the reading to stabilize, and then press the OK button until the display reads CA.HI. Use the ∧ and ∨ button to toggle to YES, and press the OK button to accept the current probe signal for the high calibration value. If you cannot perform the CA.HI calibration, or if you experience calibration issues, try doing the CA.LO calibration first (see step 8), and then the CA.HI calibration.

4. Press the OK button until the display reads DI.HI. and the ∧ and ∨ button to adjust the high calibration value to 100 (% air saturation). Press the OK button to accept the value.

5. Then press the OK button several times, until the display reads “—-” to finish the high calibration.

6. Next, place the tip of the probe in an oxygen-free water sample. This can be achieved by purging nitrogen gas into sample water or by dissolving approximately 10 grams of Na2SO3 in 500 mL of distilled water.

7. Wait for the reading to stabilize, and then press the OK button until the display reads CA.LO. Use the ∧ and ∨ button to toggle to YES, and press the OK button to accept the current probe signal for the low calibration value.

8. Press the OK button until the display reads DI.LO. and the ∧ and ∨ button to adjust the low calibration value to 0 (% air saturation). Press the OK button to accept the value.
   Usually, it is not necessary to perform a zero calibration procedure like described above (6-8) when using galvanic-type oxygen sensors. An easy alternative is to short-circuit the signal wires by using the 0-cal button on the front of the OXYREG instrument. Press and hold this button for approximately 20 seconds to allow the signal to stabilize and then accept by pressing the OK button at the same time.

9. Finally press the OK button several times, until the display reads “—-” to finish the zero calibration.

10. Rinse the probe with distilled water.

11. Place the probe into the sample, and record the sample oxygen saturation when the reading is stable.

MAINTENANCE

Between sample measurements, immerse the tip of the probe in distilled water. For long-time storage keep the probe in a dark and moist environment to avoid the very small volume of electrolyte fluid (c. 0.1 ml) from evaporating and to protect the membrane from direct sunlight. It is also a good idea to short- circuit the two signal wires to avoid deterioration of the probe anode.

RENOVATING PROBE

Renovating the probe should only be necessary if used under extreme conditions, or if the probe dried completely out during long-term storage.
Even changing the membrane should not be necessary during normal use, unless it has been damaged or got very dirty. However, a damaged or dirty membrane will result in poor performance and erroneous readings and eventually will require changing.

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1. Place the ring, chamfered edge down, into the base
2. Place a new membrane on the base above the ring.
3. Place the guide over the base, and
4. place the cap in the hole in the guide
5. Press the cap firmly down by hand
6. Fill the cap with electrolyte fluid and screw it slowly up onto the probe
7. Excess electrolyte fluid should dribble from the thread

USING THE RELAYS

The OXY-REG instrument has two independent relays to control the activity of solenoid valves. For each relay choose a set point and a hysteresis value. Now decide if the relay should be activated when the signal drops below a set point (DECR), or if it should be activated when it rises above (INCR), e.g. for hypoxic control the relay should act on an increasing (INCR) signal since oxygen saturation will increase above the set point due to atmospheric re- equilibration.
Graphic depiction of the relay function setpoint:
Example ­ how to keep oxygen saturation high despite fish respiration
Set up the OXY-REG system in the following way, to keep oxygen saturation at say 90% in aquaria with fish consuming oxygen at high rates.

1. Connect the solenoid valve to relay 1 on the back side of the OXY-REG instrument (relay 2 is not used in this example).
2. Connect a supply of air or pure oxygen gas to the solenoid valve input labeled P, using the blue PU tubing.
3. Connect the large air stone to the solenoid valve output labeled A, using the blue PU tubing.
4. Place the air stone in the aquarium. Now, when the relay turns on, the solenoid valve will open, and air or pure oxygen will bubble through the water and increase oxygen saturation in the water.
5. Press the OK button several times until the display reads REL1. Wait for one second, and the display now reads SET, or toggle using arrow buttons until it reads SET, and then press OK.
6. Now use the ∧ OR ∨ buttons to increase or decrease the set point value. Set it to 90 (% air saturation), and then press OK.
7. Set the action of the relay to DECR, and then press OK.
8. Now enter the hysteresis value. Use arrow buttons to set the value to 1%, and then press OK.
9. Press the OK button several times, until the display reads “—-” to finish.

Relay 1 will be activated every time oxygen saturation drops below 90%, allowing air or pure oxygen gas to pass the valve, tube, and air stone into the water. This will cause the oxygen saturation of the water to increase, and as it reaches 91% the relay de-activates. After some time oxygen saturation will drop below 90% again due to fish respiration, and relay 1 is activated once more.
In this way, oxygen saturation in the aquarium is automatically kept at 90-91% air saturation at all times.

PASSWORD PROTECTION

Using a password will stop access to some of the menu and parameters. There are two levels of password protection. Passwords between 0000-4999 will allow access to the fast set point adjustment and relay test. (Using this password stops access to all other parts of the menu). Passwords between 5000-9999 stop access to all parts of the menu, fast set point, and relay test. (Current set point is still shown). By using the master password 2008, all configuration menus are available.
If you want to enable password protection, press the OK button several times, until the display reads E.PAS. Use an arrow button to choose YES, and then press OK. Now set the password using the arrow buttons, and press OK when done. If you want to disable password protection, go to the menu option E.PAS. again and set it to NO. Finish by pressing the OK button.

DEFAULT SETTINGS

The OXY-REG instrument is delivered with the following default settings:

INPUT TYPE:
DECIMAL POINT:
DISPLAY LOW VALUE:
DISPLAY HIGH VALUE:
RELAY 1 UNIT:| POTMETER
111.1
0.0
100.0
DISP
---|---
REL1
SETP
ACT
HYS
ON.DE
OF.DE| 50.0
DECR
1.0
0
0
REL2
SETP
ACT
HYS
ON.DE
OF.DE| 50.0
INCR
1.0
0
0
ANALOG OUTPUT:
RESP
E.PASS
N.PASS| 4-20 (converted into a 0-5V instrument output)
0.4
YES
1234

USING THE CONTROLLER FOR DATA ACQUISITION

The instrument produces a 0-5 Volts analog output signal for data acquisition purposes. Connect the data cable to the socket marked Out on the backside of the OXY-REG instrument. Connector pin 1 is positive (+), connector pin 4 is 0 (zero).
The low instrument value (DI.LO) corresponds to a 0 V output, and the high value (DI.HI) corresponds to a 5 V output. This means, that the gain becomes HI value/5 V. With the default values the gain is then 20% air saturation/V, e.g. if the output voltage is 4 V, the calculated % air saturation value is 80%.

CHANGE OXYGEN UNITS

It is possible to measure and control oxygen in other units than % air saturation. In this case, the high display value (DI.HI) should be changed accordingly, e.g. for oxygen measurements in mmHg the DI.HI, the value should be changed to a value close to 160 mm depending on the calibration conditions etc.
Please note, that when using oxygen units other than % air saturation, it is important to keep the water temperature and salinity constant.

OXY-REG SPECIFICATIONS

Supply voltage (universal):
Internal consumption:
Max. consumption:
Isolation voltage (test / operation):
Signal- / noise ratio:
Response time, programmable:
Calibration temperature:
Accuracy:
Temperature Coefficient:
EMC immunity influence:
Potentiometer input, min:
Potentiometer input, max:
Relay function:
Hysteresis, in % / display, counts:
On and Off delay:
Sensor error detection:
Max. voltage:
Max. current:
Max. AC power:
Max. a current at 24 VDC:| 21.6-253 VAC, 50-60 Hz or 19.2-300 VDC
3.2 W
3.5 W
2.3 HVAC / 250 VAC
Min. 60 dB (0-100 kHz)
0.4-60 s
20-28°C
≤±0.1% of reading
≤±0.01% of reading/ °C
≤±0.5% of reading
10 Ω
100 kΩ
Setpoint
0.1-25% / 1-2999
0-3600 s
Make / Break / Hold
250 VRMS
2 A / AC
500 VA
1 A
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IMPORTANT: DO NOT connect relays to >500W equipment (max 2 A, 250 V).
Marine approval
Det Norske Veritas, Ships & Offshore Standard for Certification No. 2.4
Observed authority requirements:
Standard: EMC 2004/108/EC
Emission and immunity
EN 61326
LVD 73/23/EEC
EN 61010-1
UL, Standard for Safety UL 508

MINI-DO SPECIFICATIONS

temp
Cable| 3 m, other lengths available on request
Measuring range| 0-200%
Accuracy|  typically better than ± 1% of the measured value, depending on the calibration
Repeatability|  typically better than ± 0.5% of the measured value
Response time| T90 (90% of end value) is <20 sec

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