AP NH3 Manuale utente

Ammonia Detector - Manual NH3/ENH3 April.10

Automatikprodukter

Electrochemical Transmitter

1 Intendedforuse

2 FunctionalDescription

3 Mounting

3.1 Mountinginstructions

3.2 Installation

4 ElectricalConnection

4.1 Instruction

5 Commissioning

5.1 Calibration

5.2 ManualCalibration

5.2.1 Zero-point

5.2.2 Gain

5.2.3 CalculationofControlVoltage

5.3 CalibrationwithGCD-05ServiceTool

5.4 CalibrationwithGCD-05ConfigurationandCalibrationSoftware

5.5 Addressing,onlyforGCD-05_BusMode

5.6 Optionrelayoutput

6InspectionandService

6.1 Inspection

6.2 Calibration

6.3 Exchangeofsensorelement

7 Troubleshooting

7.1 AnalogeMode

7.2 GCD-05_BusMode

8Cross-sensitivityData

9Specifications

10 Figures

11 Notes and General Information

11.1 Intendedproductapplication

11.2 Installers’responsibilities

11.3 Maintenance

11.4 Limitedwarranty

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Ammonia detector - Manual NH3/ENH3 April.10

Electrochemical Transmitter

ElectrochemicalAmmoniaTransmitter

1 IntendedforUse

The NH3analog transmitter with digital processing of the measured values and temperature compensation is used

to detect leakages of ammonia in the ambient air.

The sites intended for use are all areas being directly connected to the public low voltage supply, e.g. domestic,

commercial and industrial ranges as well as small enterprises (acc. to EN 50 082).

The NH3analog transmitter is not suitable for the application in areas exposed to explosive hazards.

2 FunctionalDescription

2.1 Control Mode

In addition to the analog output the transmitter is equipped with a serial interface RS-485 for the connection to the

GCD-05 system.

Analog mode:

The analog output can be selected as current signal with (0)4-20 mA or as voltage signal (0)2-10 V.

In the 4-20 mA mode and without any supplementary options, the NH3/ENH3 also works in the 2-wire technique.

DGC-05_Bus mode:

The transmitter can be connected to the GCD-05 system via the RS-485 interface.

In this mode there is an analog input for the connection of an additional 4-20 mA transmitter.

The two measuring values are transmitted via the RS-485 interface to the gas controller.

The cable topology for the RS-485 bus can be taken from the ”Guidelines for wiring and commissioning of the

GCD-05 hardware”.

The two control modes are available in parallel.

2.2 Sensor

The sensor portion of the transmitter is a sealed micro-fuel cell with three electrodes, sensing, counter and reference.

The ambient air enters the cell through a diffusion barrier into the liquid electrolyte of the sensor.

The chemical process of the measurement is one of reduction where one molecule of the target gas is exchanged

for one molecule of oxygen.

The reaction drives the oxygen molecule to the counter electrode, generating a DC microampere signal between the

sensing and counter electrodes.

This signal is linear to the volume concentration of the sensed gas.

The signal is evaluated by the connected amplifier and transformed into a linear output signal.

Electrochemical processes always lead by-and-by to a loss of sensitivity.

Therefore regular calibration of the zero-point and of the gain is necessary. See also section 6.

Caution:

Avoid any force (e.g. by thumb) on the sensor element during operation or installation.

This could destroy the sensor element.

There is a small quantity of corrosive liquid in the sensor element.

If in case of damage persons or objects encounter the liquid, you have to clean the affected areas as fast and carefully

as possible with tap water.

Out of use sensors must be disposed in the same way as batteries.

Ammonia Detector - Manual NH3/ENH3 April.10

Automatikprodukter

Electrochemical Transmitter

3 Installation

Note:

Electronics can be destroyed by static electricity.

Therefore, do not touch the equipment without a wrist strap connected to ground or without standing on a conductive

floor.

3.1 Mountinginstructions

•The specific weight of carbon monoxide is lower than that of air (factor 0.59).

Installation at the highest point possible with a distance of cirka 300mm to the ceiling.

•Select the location of the sensor according to local regulations.

•Consider the ventilation conditions!

Do not mount the transmitter in the center of the airflow (air passages, suction holes)

•Mount the transmitter at a location with minimum vibration and minimum variation in temperature (avoid direct

sunlight).

•Avoid locations where water, oil etc. may influence proper operation and where mechanical damage might be

possible.

• Provide adequate space around the sensor for maintenance and calibration work.

Duct mounting

•Mount only in a straight section of duct with minimum air vortex.

Keep a minimum distance of 1 m (3,5 feet) from any curve or obstacle.

• Mount only in a duct system with a maximum air velocity of 10 m/s (2000 ft/min) or less.

• Mounting must be performed so that the airflow is in line with probe openings.

3.2 Installation

•Open cover of enclosure.

•Unplug basic PCB from terminal blocks.

•Fix bottom part by screws vertically to the wall (terminal blocks to the ground).

•Plug in the basic PCB at X4 and X5.

•Replace the cover.

4 ElectricalConnection

Instruction

Consider static electricity! See 3. Mounting

•Installation of the electrical wiring should only be performed by a trained specialist according to the connection

diagram, without any power applied to conductors and according to the corresponding regulations!

•Avoid any influence of external interference by using a shielded cable.

•Recommended cable: J-Y(St)Y 2x2x0.8LG (18 AWG), maximum resistance 73 Ω/1000 m (20.8 Ω/1000 ft)

•When the PCB is mounted, it is important to ensure that the wire shields or any bare wires do not short the

PCB.

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Ammonia detector - Manual NH3/ENH3 April.10

Electrochemical Transmitter

4.1 Wiring connection

•Unscrew cover of enclosure.

•Unplug basic PCB from terminal blocks.

•Connect cable leads to terminal block X4.

•Plug the PCB in the fixed terminal blocks on base.

•Screw cover on base

5 Commissioning

Consider commisioning instructions at any exchange of sensor elements.

Only trained technicians should perform the following:

•Check mounting location.

•Select output signal form: Current or voltage, and starting point 0 o 20%. See fig.4

•Check supply voltage.

•Check PCB for proper mounting at X4 and X5.

•Check for correct sensor element at terminal X3 PCB EC-S.

•Addressing of the transmitter in the GCD-05_Bus mode..

•Calibration of the transmitter (if not factory-calibrated).

Note:

Prior to calibration the sensor element must be fully stabilized by applying power voltage for at least 18 hours

without interruption.

Please observe proper handling procedures for test gas bottles according to TRGS 220!

NH3calibration gas is toxic, never inhale the gas!

Symptoms at high concentrations: Loss of motility and consciousness.

Procedure if exposed: Get the victim into fresh air at once, consult doctor.

5.1 Calibration

Depending on the version and the control mode there are three different possibilities to calibrate the transmitter:

Manual calibration

Manual calibration is only possible if the transmitter is equipped with the push-button ”Zero” and the potentiometer

”Gain” (= version for manual calibration).

Manual calibration is possible both in analog mode and in DGC-05_Bus mode.

In the GCD-05_Bus mode the jumper V-A has to be set before manual calibration.

Only by doing so the control voltage is available at the test pins X6.

Remove the jumper after calibration

Calibration with the Service Tool DGC-05

In the standard version (equipped with the communication connector X12) the transmitter is delivered for tool and/

or software calibration.

In the analog mode the service tool calibration is only possible with the 3-wire technique of the transmitter!

In the GCD-05_Bus mode calibration is always possible.

Ammonia Detector - Manual NH3/ENH3 April.10

Automatikprodukter

Electrochemical Transmitter

Software calibration via PC

In the standard version (equipped with the communication connector X12) calibration can also be done by means of the

configuration and calibration software.

Software calibration is possible for both control modes.

5.2 Manual Calibration

5.2.1 Zero-point

•Connect the calibration adapter carefully to the sensor element.

•Apply zero calibration gas, (0,3 l/min; 1 Bar ± 10%), or other clean air source to the sensor element.

•Wait 3 minutes until the signal is about 40 mV and stable, then press the button Zero for 5 seconds. Finished!

After successful calibration the measuring signal is corrected automatically.

Depending on the selected signal starting point the measuring signal shows the following values:

Signal start at 2 V or 4 mA 40 mV = 0 ppm

Signal start at 0 V or 0 mA 0 mV = 0 ppm

If the zero-point is out of the admissible range (> 20 mV at starting point 0% / > 60 mV at starting point 20%)

before calibration, there is no correction of the measuring signal.

The sensor has to be replaced.

•Remove calibration adapter carefully by turning lightly. Inspect close seat of sensor element!

5.2.2 Gain

•Connect calibration adapter carefully to the sensor element.

•Apply test gas NH3(20 to 70 % of the measurement range) to the sensor (0,3 l/min; 1 Bar ± 10%)

•Wait 3 minutes until the sensor is stable, adjust signal with gain potentiometer ”Gain” until the signal corresponds

to the appropriate mVDC ± 3 mV (see calculation control voltage 5.3) and is stable.

•Remove calibration adapter with a careful light turn. Inspect the correct mounting of the sensor element.

By limiting the gain factor, calibration will not be possible any more when the sensitivity of the sensor reaches a

residual sensitivity of 30 %.

Then the sensor has to be replaced.

5.2.3 Calculation of Control Voltage

Control voltage (mV) = 160 (mV) x test gas concentration NH3(ppm) + 40 (mV)

measuring range NH3(ppm)

Example_

Measuring range NH3300 ppm 1000 ppm

Test gas concentration NH3205 ppm 405 ppm

Control voltage 149 mV 105 mV

160 (mV) x 205 (ppm) + 40 (mV) = 149 mV.

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Ammonia detector - Manual NH3/ENH3 April.10

Electrochemical Transmitter

5.3 Calibration with GCD-05 Service Tool

•Connect the GCD-05 Service Tool to the transmitter, open menu ”Calibration”.

•Enter measuring range and test gas concentration.

•Connect calibration adapter carefully to the sensor element

•Apply synthetic air (150 ml/min; 1 Bar (14.5 psi ) ± 10%), or NH3-free ambient air.

•Wait until the measuring value is stable, and then perform automatic zero calibration.

•Apply calibration test gas NH3(20 to 70 % of the measurement range) to the sensor (0,3 l/min; 1 Bar ± 10%).

•Wait until the measuring value is stable, and then perform automatic gain calibration.

•Remove calibration adapter carefully by turning lightly. Check the sensor for correct mounting!

By limiting the gain factor, calibration will not be possible any more when the sensitivity of the sensor reaches

a residual sensitivity of 30 %. In this case the sensor has to be replaced.

Further information can be taken from the user manual of the GCD-05 Service Tool.

5.4 Calibration with GCD-05 Configuration and Calibration Software

•Connect the PC via USB/RS-485 communication set to the transmitter, open menu ”Calibration”.

•Enter measuring range and test gas concentration.

•Connect calibration adapter carefully to the sensor element

•Apply synthetic air (150 ml/min; 1 Bar (14.5 psi ) ± 10%), or NH3-free ambient air.

•Wait until the measuring value is stable, and then perform automatic zero calibration.

•Apply calibration test gas NH3(20 to 70 % of the measurement range) to the sensor (0,3 l/min; 1 Bar ± 10%).

•Wait until the measuring value is stable, and then perform automatic gain calibration.

•Remove calibration adapter carefully by turning lightly. Check the sensor for correct mounting!

By limiting the gain factor, calibration will not be possible any more when the sensitivity of the sensor reaches a

residual sensitivity of 30 %. In this case the sensor has to be replaced.

Further information can be taken from the user manual of the GCD-05 Configuration and Calibration Software.

Ammonia Detector - Manual NH3/ENH3 April.10

Automatikprodukter

Electrochemical Transmitter

5.5 Addressing, only for GCD-05_Bus Mode

In the GCD-05_Bus mode each transmitter gets its communication address.

In the standard version with the communication connector X12, addressing is done by means of the GCD-05 Service

Tool or by the GCD-05 Configuration and Calibration Software.

See user manual of the Service Tool or of the Configuration and Calibration Software.

In the manual addressing version which can be identified by the address switch being equipped, there is a maximum

of 60 addresses to be selected. See fig. 3.

The jumper is responsible to define the address group and the switch to define the address according to the following

table

Switch Jumper pos. 01 Jumper pos. 02 Jumper pos. 03 Jumper pos. 04

position = address = address = address = address

0 inactive inactive inactive inactive

1 011631 46

2 021732 47

3 031833 48

4 041934 49

5 052035 50

6 062136 51

7 072237 52

8 082338 53

9 092439 54

A 102540 55

B 112641 56

C 122742 57

D 132843 58

E 142944 59

F 153045 60

5.6 Option Relay Output

The two relays are activated in dependence of the gas concentration. If the gas concentration exceeds the adjusted

alarm threshold, the corresponding relay switches on.

If the gas concentration falls below the threshold minus hysteresis, the relay switches off again.

The contact function for relay 2, NC (normally closed) or NO (normally open), can be selected via the jumper NO/

NC. See fig 1 and 3. Relay 1 is equipped with a change-over contact.

Via the ModBus interface the two alarm thresholds and the hysteresis are freely adjustable at the PC within the

measuring range.

The procedure can be read from the user manual ”ModBus Software”.

The following parameters are factory-set.

Alarm threshold 1 = Relay 1: 80 ppm

Alarm threshold 2 = Relay 2: 250 ppm

Switching hysteresis: 15 ppm

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Ammonia detector - Manual NH3/ENH3 April.10

Electrochemical Transmitter

6 ServiceandInspection

6.1 Inspections

Inspection, service and calibration of the transmitters have to be done by trained technicians and executed at

regular intervals.

We therefore recommend to conclude a service contract with AP or one of their authorized partners.

6.2 Calibration

(See section 5.1 and 5.2)

•At commissioning and at periodic intervals determined by the person responsible for the gas detection system

(recommendation: every 6 months)

•After exchange of the sensor

•If in case of operational or climatic influences the sensitivity of the sensor falls below 30 % in operation, calibration

will not be possible any more.

Then the sensor has to be replaced.

6.3 Exchange of Sensor Element

Consider static electricity! See point 3.

Sensor should always be installed without voltage applied.

•Unplug basic PCB carefully from the terminal blocks on base.

•Unplug old sensor element from the PCB.

•Take new sensor element out of original packing.

•Plug in sensor element into the PCB at X3.

•Plug in carefully the PCB into terminal block X4, X5.

•Calibrate according to section 5.

7 Troubleshooting

7.1 Analog Mode

Trouble Cause Solution

Output signal < 3 mA / 1,5 V Jumper 0-20 % not set Check jumper position

and/or control voltage < 30 mV

only for starting signal 2V/4 mA Power voltage not applied Measure tension at X4:

Two-wire: Pin 1 (+) and 4 (-)

Three-wire: Pin 1 (+) and 2 (-)

PCB not plugged in correctly

at X4 and X5 Replug PCB correctly

Wire break Check the wiring

____________________________________________________________________________________________________

Output signal > 22 mA /220 mV Short-circuit Check the wiring

_________________________________________________________________________________________________

Control voltage does not reach

the calculated value Sensor element not calibrated Calibrate sensor element

Sensor sensitivity < 30 % Replace sensor element

___________________________________________________________________________________________________

No reaction of the output signal

in spite of gas concentration Power voltage not applied Measure tension at X4

Signal (Pin 4) not wired correctly Check the wiring

Ammonia Detector - Manual NH3/ENH3 April.10

Automatikprodukter

Electrochemical Transmitter

7.2 GCD-05_BusMode

Trouble Cause Solution

Yellow LED not shining Power voltage not applied Measure tension at X4:Pin 1 (+) and 2 (-)

PCB not plugged in correctly at X4/X5 Replug PCB correctly

Wire break Check wiring

_________________________________________________________________________________________________

Yellow LED not flashing No communication at the transmitter Transmitter not addressed, check bus wiring

incl. topology and termination

Voltage < 16 V

__________________________________________________________________________________________________

No control voltage at calibration Jumper V-A not set Set the jumper. Remove it after calibration!

2 CrossSensitivityData

The cross sensivity depends on the used transmitter type and can be read from the table Technical Data (see 9.).

Other gases can have an influence on the sensivity, too.

The table does not claim to be complete.

The indicated sensivity data are only standard values referring to new sensor elements.

Automatikprodukter

Ammonia detector - Manual NH3/ENH3 April.10

Electrochemical Transmitter

9 TechnicalData

General sensor performances

Gastype Ammonia(NH3)

Sensorelement Electrochemical,diffusion

Measuringrange 0 - 300 ppm / 0 - 1000 ppm

Pressurerange Atmosphere ± 15 %

Humidity 15 – 90 % RH non condensing

Storagetemperaturerange 5 °C to 20 °C

Storage time Max.3months

_____________________________________________________________________________

Type NH3

Accuracy 4 ppm

Repeatability < 3 % of reading

Zero-point 0 ppm ± 16 ppm

Long-termoutputdrift <5%signalloss/6months

Responsetime t90 < 35 sec.

Temperaturerange -10 °C to + 40 °C

Lifeexpectancy > 2 years/normal operating environment

Crosssensitivity* Concentration Reaction

Carbon monoxide; CO 300 ppm 0 ppm

HydrogenH2 200 ppm 0 ppm

Sulphur dioxide SO2 20 ppm - 7 ppm

HydrogensulphideH2S 20 ppm 7 ppm

NitratemonoxideNO 20 ppm - 1 ppm

Nitrogen dioxide NO2 20 ppm - 20 ppm

Chlorine Cl2 20 ppm - 55 ppm

Carbon dioxide CO2 2% vol 0 ppm

_____________________________________________________________________________

Type ENH3

Accuracy < 15 ppm

Repeatability < 5 % of reading

Zero-point 0 ppm ± 15 ppm

Long-termsensitivityoutputdrift <10%signalloss/6months

Responsetime t90 < 120 sec.; t50 < 20 sec.

Temperaturerange -40 °C to + 10 °C

Lifeexpectancy > 18 months/normal operating environment

Crosssensitivity* Concentration Reaction

Carbon monoxide; CO 100 ppm 95 ppm

HydrogenH2 3000 ppm 3000 ppm

Sulphurdioxide SO2 20 ppm 5 ppm

HydrogensulphideH2S 20 ppm 40 ppm

Phosphates 300 ppm 0 ppm

Nitrogen dioxide NO2 10 ppm 0 ppm

Chlorine Cl2 5 ppm 0 ppm

HydrogenchlorideHCl 10 ppm 0 ppm

Carbon dioxide CO2 0,5 % vol 0 ppm

Alcohols 1000 ppm yes

Amine —- yes

Arsines 0,2 ppm 0 ppm

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