T02.0.4X.6C-11

Measuring transducer for air oxygen

as of version V1.3

operating manual

OXY 3690 MP

OXY 3690 MP - LO

WEEE-Reg.-Nr. DE 93889386

GHM Messtechnik GmbH • Standort Greisinger

Hans-SachsStr. 26 • D-93128 Regenstauf



+49 (0) 9402 / 9383-0



+49 (0) 9402 / 9383-33

 [email protected]

T02.0.4X.6C-11 page 2 of 6

Safety instructions:

This device has been designed and tested in accordance with the safety regulations for electronic devices.

However, its trouble-free operation and reliability cannot be guaranteed unless the standard safety measures and special safety advises given in this manual will be adhered to when using the device.

1. Trouble-free operation and reliability of the device can only be guaranteed if the device is not subjected to any other climatic conditions than those stated under "Specification". If the device is transported from a cold to a warm environment condensation may cause in a failure of the function. In such a case make sure the device temperature has adjusted to the ambient temperature before trying a new start-up.

2. General instructions and safety regulations for electric, light and heavy current plants, including domestic safety regulations (e.g. VDE), have to be observed.

3. If device is to be connected to other devices (e.g. via PC) the circuitry has to be designed most carefully. Internal connection in third party devices (e.g. connection GND and earth) may result in not-permissible voltages impairing or destroying the device or another device connected.

4. If there is a risk whatsoever involved in running it, the device has to be switched off immediately and to be marked accordingly to avoid re-starting.

Operator safety may be a risk if:

- there is visible damage to the device

- the device is not working as specified

- the device has been stored under unsuitable conditions for a longer time.

In case of doubt, please return device to manufacturer for repair or maintenance.

5. This device only serves as supervision by the monitoring of essential or other for the customer important systems.

It must not be used instead of compulsory approval monitoring devices and it is not designed for that purpose. If this device is used for the monitoring of such systems on its own, the manufacturer will not assume liability for damages whatsoever.

6. Caution, acid! The sensor contains KOH. This can cause severe chemical burns. If leaking, avoid contact!

If there was contact:

- to skin: Flush contacted area with large amounts of water for several minutes.

- to clothing: remove contaminated clothing.

- to eyes: Flush with large amounts of water for several

minutes, obtain medical treatment.

After swallowing:

- give large volumes of water. DO NOT induce vomiting!

- Obtain medical treatment.

7. Warning:

Do not use these product as safety or emergency stop devices, or in any other application where failure of the product could result in personal injury or material damage.

Failure to comply with these instructions could result in death or serious injury and material damage.

Disposal notes

This device and the sensor must not be disposed as ‘residual waste’.

According to the ElektroG (law for bringing into market, the return and the environmentally friendly disposal of electronic equipment) we accept the return of this device and/or the sensor, please send it directly to us (adequately stamped). We will dispose it appropriately and environmentally friendly.

T02.0.4X.6C-11

Assignment of elbow-type plug:

2-wire connection (4-20mA) 3-wire connection (voltage) 4-wire connection (voltage) page 3 of 6

1 = supply voltage +Vs

2 = GND / signal

1 = signal +

3 = supply voltage +Vs

(4)

= supply voltage -Vs

signal -

1 = signal +

2 = signal -

3 = supply voltage +Vs

(4) = supply voltage -Vs

General installation instructions:

To mount the connection cable (2-, 3-, or 4-wire depending on type of device) the elbow-type plug screw has to be loosened and the coupling insert has to be removed by means of a screw driver at the position indicated (arrow).

Pull out connection cable through PG glanding and connect to the loose coupling insert as described in the wiring diagram.

Replace loose coupling insert onto the pins at the transducer housing and turn cover cap with PG glanding in the direction desired till it snaps on (4 different starting positions at 90° intervals). Re-tighten the screw at the angle plug.

Display functions:

During normal operation the oxygen content of the air is displayed in the unit [%] . By pressing the Key 2 (down) the temperature at the sensor can be shown, pressing key 3 (up) shows the electrode rating in [%] . The electrode rating is calculated and stored during the calibration (see below). The displays of the rating and the temperature of the sensor are marked by small arrows at the upper end of the display. After 5 seconds the transducer display switches automatically back to the oxygen value. display dissolved oxygen

Calibration of the sensor:

display sensor temperature display electrode rating

Expose sensor to the ambient air, wait until the temperature has adopted to the ambient conditions.

Press key "SET" for 2 sec., The display shows "CAL".

After approx. 10 sec’s the transducer is calibrated or a referring error message will be shown:

Display Meaning

CFE.1 temperature out of allowed range sensor error

CFE.3 wrong signal: to low

CFE.4 wrong signal: to high

CFE.6 instable signal

Possible fault causes Remedy temperature has to be within 5 to

40°C temperature sensing defective sensor element used up calibrate again at correct temperature check cable & connection, replace sensor if necessary replace sensor element calibration surrounding not valid check Calibration surrounding calibration surrounding not valid check Calibration surrounding

During calibration the rating of the electrode is evaluated: 100% means perfect state, 40 % means e.g. sensor element has a weak output signal and needs to be replaced soon (p.r.t. sensor manual). The electrode rating can be displayed with key 3 (down).

T02.0.4X.6C-11 page 4 of 6

Configuration of the device

For the correct function of the device in its application, it has to be configured to meaningful settings. For doing this the cover has to be removed. Then the jumper J1 right above of key 2 has to be set.

Then use following configuration procedure:

1. Press key one more than 4 sec’s until PAbS appears in the display

Now PAbS and the referring setting are shown alternating

I.) Average ambient absolute pressure „PAbS“

(function of the altitude above sea level):

Necessary for a correct evaluation of the electrode rating. If the application works for example at an altitude of 275 m above sea level, 980mbar is a correct setting.

Please refer to Appendix A

2. Enter the desired value by using keys 3 (up) and 2 (down).

Input range: 500...2000 mbar

3. Acknowledge the value with key 1 (set).

4. The settings are stored. The unit starts up again. (8888 in display)

Attention: Bring back the jumper j1 to the ‚parking position‘ after configuration (one contact connected, the second contact ‚on air‘)!

Then the device can be calibrated by key 1 and the configuration data is protected.

Error and System Messages

Display Description Possible fault cause Remedy

FE 1 measuring range exceeded Calibration is wrong

FE 2

FE 7

FE 9

8.8.8.8

Measuring values below measuring range

System fault

Input signal is not valid

Segment test

Input signal is not valid

Recalibrate the transducer.

Wrong signal

Error in device

Check the connections, cable and sensor.

Disconnect from supply and reconnect. If error remains: return to manufacturer

Sensor not connected or

cable defective

Temperature out of range

Check sensor, cable and connections

Check temperature

The transducer performs a display test for 2 seconds after power up. After that it will change to the display of the measuring.

Sensor not connected Check sensor, cable and connections

Permissible input range is exceeded

Check if not a wrong sensor is connected.

Replace sensor.

Appendix A: abs. ambient pressure as a function of the altitude above sea level

Altitude [m]

-100

0

100

200

300

400

500

Pabs [mbar)

1025

1013

1001

989

977

966

954

Values between are to be interpolated

Altitude [m]

600

700

800

900

1000

1200

1400

Pabs [mbar)

943

932

920

909

898

877

856

Altitude [m]

1600

1800

2000

2500

3000

4000

Pabs [mbar)

835

814

794

746

701

616

T02.0.4X.6C-11 page 5 of 6

Appendix B: oxygen sensor

General information about the oxygen sensors

I.) Lifetime:

At the end of life time the sensor signal drops relatively fast. The electrode evaluation in % therefore just can be used for orientation. An evaluation of 70% does not mean that 70% of life time are remaining, but 70% of the reference signal are available, which happens normally at the end of life time.

Note: The electrode evaluation is updated by the instrument every time, when the calibration of the sensor was performed successfully. (please also see the referring manual of the instrument)

The nominal life time can be shortened significantly by usage. Influencing factors are:

- Storage- / Operation temperature

- Humidity of measured gas: If permanently used with dry gases (technical gases, bottled gas) the life time decreases considerably.

It helps, if the sensor is brought to normal humid ambient air in measuring breaks (“flush” system with fresh air).

II.) Operating position:

The optimum operation position is with the sensor inlet pointing downwards, maximum differential pressure to ambient is

250 mbar.

III.) Measuring precision:

The measuring precision can be influenced by:

- Liquids at the sensor inlet. Rinse the inlet and dry with lint-free cloth.

Attention: avoid liquids of any kind at the contacts

- Gas and sensor temperature have to be at same level. Best precision, when calibrated at measuring temperature.

- Pressure fluctuations: The sensor is originally a partial pressure sensor, i.e. changes in the absolute pressure are influencing the measuring result directly proportional. A pressure change of 1% will cause a additional measuring error of 1%!

For optimum precision calibrate at the same conditions at which You want to measure.

Application of the different sensor types GGO... /MU

(standard)

and GOO... / MU

(option)

GGO... (closed sensor)

For measurements at atmosphere and in systems without over or under pressure the GGO is sufficient. Additionally the

GGO can be screwed impermeable to systems with low over or under pressure.

Attention! If the sensor cannot be calibrated at exactly the same pressure, the measurement will be faulty! For such applications we have integrated a manual pressure compensation. Then the GGO can be connected to systems with a known pressure (Attention: please note the specified operating pressure for one-sided strain). The pressure can be entered to the device an will compensated by the device such no additional measuring error will occur.

GOO... (open sensor)

The sensor is equipped with drillings at the end and because of its special construction the measuring gas streams optimally around the sensor. No pressure can appear while gas blows to the sensor, which otherwise would result in erroneous measures.

The temperature compensation speed of the sensor also is optimised by this design. The measuring gas escapes into the air. Especially the measuring of gases from compressed gas bottles, where the expansion of the gas leaving the bottle lowers the temperature, is optimised with regard to the temperature compensation and pressure errors. The gas flow should be chosen in a suitable range, where no overpressure can happen, esp. if the sensor is connected directly to the source e.g. by means of a tube.

Oxygen measuring notes

Calibration and measuring are depending of the absolute pressure at the sensor.

Therefore check the absolute pressure before calibration and measuring.

Sensor temperature and gas temperature should be the same.

Temperature differences may cause additional measuring errors! In worst case conditions it may take up to several hours until both temperatures are adjusted. A suitable flow of the gas around the sensor element increases the adjustment significantly.

T02.0.4X.6C-11 page 6 of 6

Specification: OXY 3690 MP

Display range: 0,0 ... 100,0 % air oxygen

Rec. sensor meas. range: 0,0 ... 100,0 % air oxygen

OXY 3690 MP - LO

0,0 ... 100,0 % air oxygen

0,0 ... 25,0 % air oxygen

Sensor name:

Sensor type:

(Standard) GGO 370 / MU electrochemical partial oxygen pressure sensor

Meas. range O

2

-Concentration : 0,0 ... 100,0 % O

2

(gaseous)

GGO 380 / MU electrochemical partial oxygen pressure sensor

0,0 ... 25,0 % O

2

(gaseous)

Electrolyte: basic acid

Response time:

Linearity: < 2 % O

2

< 25 % O

2

> 25 % O

2

Cross sensitivities:

90% at <10sec., depending on temperature 90% at <15sec., depending on temperature

± 0.2 % O

± 0.5 % O

2

± 1.0 % O

2

2

± 0.1 % O

2

± 0.5 % O

2 not specified signal of <0.1 % O

15% CO

2

2 in N

2

, 10% CO

at

1000ppm Benzene in N

2 in N

2

, 3000ppm NO in N

2

, 100% CO

2

, 100% CO, 3000ppm NO in N

2

,

3000ppm C

3

H

8

in N

2

, 500ppm H

2

S in N

2

, signal of <0.002 % O

1000ppm H

2

2000ppm SO

in N

2

2

in N

2

at:

, 100% C

3

H

8

, 2000ppm H

2

S

2

, 1000ppm Benzene in N

2 in N

2

,

Working temperature: 0 ... +50 °C 0 ... +45 °C

Operating pressure:

Warranty period:

Nominal sensor life:

0.5 to 2.0 bar absolute (at one-sided strain: max. 0.25 bar over-/under-pressure)

12 months ( assuming appropriate usage according to the manual) approx. 2 years at nominal condition

Temperature compensation: integrated in oxygen sensor

Sensor connection: 5-pole screwable socket

Device accuracy:

Display add. output signal:

±0,1% oxygen ±1digit (adjusted device, at nominal temperature = 25°C)

±0,2 % FS

Output signal:

Connection: refer to type plate

4 - 20 mA (2-wire)

Voltage (3- or 4-wire)

Auxiliary energy: ( supply voltage

) Uv = 12 - 30 V DC (4-20mA)

Uv = 18 - 30 V DC (0-10V) or refer to type plate

Electric isolation: input electrically isolated

Reverse voltage protection: 50V permanent

Perm. impedance

(at 4-20mA)

: R

A

(Ohm) < ( (Uv - 12V) / 0.02A )

Example: for Uv = 18V: R

A

< (18V - 12V) / 0.02A => R

A

< 300 Ohm

Permissible load (at 0-...V) : R

L

(Ohm) > 3000 Ohm

Display:

Working conditions:

Storage temperature: approx. 10 mm high, 4-digit LCD-display

0 ... 45°C, 0 ... 95 %RH (non-condensing)

-20 ... 70°C (sensor: -15 ... 50°C)

Housing:

Dimensions:

Mounting:

Mounting distance:

Sensor dimensions:

Electric connection:

EMC:

ABS (IP65 - with the exception of sensor and temperature probe connection sockets)

82 x 80 x 55 mm (without elbow-type plug and sensor sockets) with fixing holes for wall mounting (in housing - accessible after cover has been removed )

50 x 70mm, max. shaft diameter of mounting screws is 4 mm.

GGO3x0..: approx. Ø 36 mm x 95 mm (150 mm incl. anti-buckling glanding),

GOO3x0..: approx. Ø 40 mm x 105 mm (160 mm incl. anti-buckling glanding)

Housing with M16 x 1-screw thread (sensor can be connected to line tubes by means of an additional adapter ) elbow-type plug conforming to DIN 43650 (IP65), max. wire cross section: 1.5 mm², wire/cable diameter from 4.5 to 7 mm

The device corresponds to the essential protection ratings established in the Regulations of the

Council for the Approximation of Legislation for the member countries regarding electromagnetic compatibility (2004/108/EG). In accordance with EN50081-1 and EN50082-1

Additional error: <1%