Sensitron P User manual

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USER MANUAL FOR
SMART “P” GAS DETECTORS
SENSITRON S.r.l. Viale della Repubblica, 48
20010 CORNAREDO MI - Italy
Ph: + 39 02 93548155 Fax: + 39 02 93548089
E-MAIL: [email protected]

Technical Manual SMART P
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Warning
THIS MANUAL MUST BE CAREFULLY READ BY ALL PERSONS WHO HAVE OR
WILL HAVE THE RESPONSIBILITY FOR INSTALLING, USING OR SERVICING THIS
PRODUCT.
Like any equipment, this product will perform as designed only if installed, used and
serviced in accordance with the manufacturer’s instructions. OTHERWISE, IT COULD
FAIL TO PERFORM AS DESIGNED AND PERSONS WHO RELY ON THIS PRODUCT
FOR THEIR SAFETY COULD SUFFER SEVERE PERSONAL INJURY OR DEATH.
The warranties made by Sensitron s.r.l. with respect to this product are voided if the
product is not installed, used and serviced in accordance with the instructions in this
user guide. Please protect yourself and others by following them.
We recommend our customers to write or call regarding this equipment prior to use or
for any additional information relative to use or repair.

Technical Manual SMART P
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INDEX
1) DESCRIPTION...................................................................................................................................... 4
1.1) TECHNICAL SPECIFICATIONS.............................................................................................................. 5
2) INSTALLATION.................................................................................................................................... 6
2.1) CIRCUIT LAYOUT............................................................................................................................... 7
2.2) ELECTRIC WIRING............................................................................................................................. 8
2.3) DETECTOR POWER ON..................................................................................................................... 9
2.4) TESTING AND USE ............................................................................................................................ 9
2.5) HANDHELD CALIBRATION KEYPAD ST.S/CKD PK............................................................................... 9

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1) DESCRIPTION
SMART P gas detectors come in the following versions based on the type of gas to be
detected:
CO, range 0-300 ppm, 3 pin industrial cell
NO2, range 0-30 ppm, 3 pin industrial cell
Detectors with dual sensor were manufactured to optimise installation costs, coupled with the
CO-NO2 and CO-PETROL VAPOUR sensor in a single case.
SMART P use high performance sensor cells and test all functions including a self test for
CO cell reliability.
SMART P detectors are set for 4-wire connections: 2 for power and 2 for data communications
via RS485 serial to the MULTISCAN++PK unit.
SMART P provide fast and safe installation as well as easy maintenance and field calibration
via the STS/CKD-PK calibration keypad.
Detectors run on 12-24 Vdc power and sold in IP55 metallic cases.
SMART P-1
Designed to fulfil the new European Standard
for gas detection in car parks, the SMART P-1
gas detectors provide a serial RS485.
The SMART P-1 employ electrochemical cells
for the detection of CO or NO2.
To meet with the standard in full, these
detectors are to be connected to
MULTISCAN++PARK gas control panels.
SMART P-1 detectors for Carbon Monoxide and NO2
CODE
DESCRIPTION
CAT.
€
S2398CO
CO detector for car parks RS485 serial outputs. Range 0-300
ppm.
B
240,00
S2399ND
NO2 detector for car parks, RS485 serial outputs. Range 0-30
ppm.
B
320,00
SMART P-2
Designed to fulfil the new European Standard
for gas detection in car parks, the SMART P-2
gas detectors offer the simultaneous detection
of CO and NO2 or Petrol vapours integrated in
the same detector.
The SMART P-2 provide a serial RS485.
To meet with the standard in full, these
detectors are to be connected to
MULTISCAN++PARK gas control panels.

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SMART P-2 detector for Carbon Monoxide and Nitrogen Dioxide/Petrol
Vapours
CODE
DESCRIPTION
CAT.
€
S2400CO-ND
CARBON MONOXIDE & NITROGEN DIOXIDE detector for car
parks, RS485 serial output. Range 0-300 ppm CO and 0-30
ppm NO2.
B
400,00
S2400CO-VB
CARBON MONOXIDE & PETROL VAPOURS detector for car
parks, RS485 serial output. Range 0-300 ppm CO and 0-
100%LEL Petrol Vapours.
B
420,00
CALIBRATION TOOLS for SMART P
CODE
DESCRIPTION
CAT.
€
STS/CKD-PK
Handheld calibration keypad to be connected to the detector to
adjust the Zero, Span and 4-20mA values.
A
200,00
1.1) Technical specifications
Typical use
To be used with MULTISCAN++PK
256/128/64/32 type units to monitor toxic gas in
car parks and garages
Detectable gas
Carbon Monoxide 0-300 ppm.
Nitric dioxide 0 - 30 ppm
Petrol Vapours 0-100% LEL
Sensor used
Electrochemical cell for CO and NO2. Catalytic
for Petrol Vapour.
Power
12-24 Vdc (-20% +15%)
Proportional output
RS485 serial
Absorption at
12-24Vdc
CO max 70mA
NO2 max 70mA
CO+NO2 max 80mA
CO+PETROL VAPOUR max 110 mA
Repeatability
5% FS
Storage temp.
-25 / + 60 °C
Working temperature
-20 / + 60 °C
Relative humidity
20-90 % non condensed RH/40°C
IP protection level
IP55
Weight
600 gr.
Dimensions
L. 100, H. 180, D. 65 mm
Estimated sensor life
4 years for CO and PETROL VAPOUR sensors
3 years for NO2 sensor

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2) INSTALLATION
At the mounting and installation phase be sure all safety precautions have been
considered.
Always consider how important it is the correct positioning of gas detectors to get the
optimum response. Be careful never to install gas detectors close to air intakes or fans
causing strong air currents.
Be sure the detectors are attached to a firm base to prevent vibration that can damage
them, producing unreliable results.
Although the electronics comply with the electromagnetic compatibility rules, it is
advised to keep the detectors at a distance from any radio frequency senders (such as
radio links or similar).
Please be also sure that detectors are placed in a convenient location for future
maintenance and calibration requirements.
We recommend you mount the Smart P detector at nose level (about 150 cm off the ground)
since this is the position suited to detect CO and NO2. The Petrol Vapour detector should, on
the other hand, be installed about 30 cm off the ground. the CO+PETROL VAPOUR detector
comes with an extension kit to mount the Petrol Vapour sensor 30 cm off the ground.
Also remember that correct detector positioning is essential to ensure prompt and accurate
detection.
The gas detector is always to be mounted with the sensing element placed downward.
For no reasons at all the enclosure can be drilled.
Wall mount the detectors by employing the existing holes
150mm
front back

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2.1) Circuit layout
1
2 3
4
+
-
A
B
Connections terminal block
Morsettiera collegamento
Scheda elettronica rilevatore
Detector electronic board
Sensor Head 2 connection (E.C. Electr. Cell or Cat sensor) Testa sensore 2 (E.C. Cella Elettrochimica o sensore catalitico)
Jp10 Rs485 End of Line 120 Ohm resistor Closed: resistor Open: no resistor
Jp10 resistenza fine linea Rs485 (120 Ohm) Closed: resistenza ins. Open: no resistenza
Sensor Head1 connection (E.C. Electr. Cell)
Testa sensore 1 (E.C. Cella Elettrochimica)
Jp8 selezione baudrate Rs485 comm
APERTO:9600 Bps / : 115000 Bps
Jp8 Rs485baud rate selection
OPEN:9600 Bps /CLOSED : 115000 Bps
Jp7 connection of hand held calibration keypad Jp7 collegamento tastiera calibrazione
Dl2 Led Green: detector activity. Repeat the various detector status
Led Verde Dl1: attività dispositivo. Ripete i diversi stati del rilevatore
Dl3 Led Red: Rs485 monitor Lit in communication Led Rosso Dl3: monitor Rs485. Accesso in comunicazione
Dl2 LedRed: Rs485 Watch dog monitor. Serious problem Led ON
Led Rosso Dl2: monitor Watch dog Led ON guasto dispositivo
CHIUSO

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2.2) Electric wiring
The connection of the detectors to RS485 bus lines should be performed by using a 4-wire
cable, 1 pair for the RS485 bus and 1 for the power supply.
Wiring between the detectors and the control panel should be made by using connection cable
EIA RS485: 2 core wires with section 0.22 / 0.35 mm2 and shield (twisted pair). Nominal
capacity between the wires <50pF/m, nominal impedance 120 ohm.
These features can be found in BELDEN cable 9842 or similar (data transmission cable in EIA
RS485).
Using this wiring, the total length of the line should not exceed m 1000.
Detectors and output modules are to be wired in daisy chain mode. We recommend avoiding
star or tree mode connection as interference immunity would be reduced.
Make sure that a 120 Ohm end line resistor is placed at the beginning and at the end (on the
last detector or output module) of the bus line.
For the detectors' power supply connection we recommend to use a 2-wire cable with suitable
section according to the distance and number of detectors.
Once the installation has been completed, verify that each detector reaches at least 12 Vdc.
Each Smart P detector connected on the unit line must have a univocal address. Use the
specific STS/CKD PK keypad to set the detector address. See the specific paragraph below in
the manual.
+
-
A B
S2
S1
1
6
A
B
+
-
Detector
+
-
A B
S2
S1
1
6
A
B
+
-
Detector
+
-
A B
S2 S1
1
6
A
B
+
-
Detector
Al rilevatore successivo (*)
to the next detector (*)
Dalla centrale
From the control panel
note: if the detector (or the module)
is the last of the line: close
the 120 ohm resistor jumper
nota: se il rilevatore (o il modulo uscite)
è l’ultimo sulla linea: chiudere
il jumper della resistenza da 120 ohm
+-
A B
ST.G/OUT16 module

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2.3) Detector power ON
When the detector is powered on, the green LED DL1 on the motherboard starts blinking at
slow intermittence.
After nearly two minutes, the red LED flash rate is equivalent to the detector working status (see
table below).
Once the warm-up phase is over, the detector can work correctly, although the optimal
performances will be achieved after two hours.
2.4) Testing and Use
Detectors are factory calibrated for the specific gas required by the customers. Future
adjustment of the preset calibration can be carried out by employing the calibration keypad.
Testing should be carried out by using a gas mixture in the appropriate range, along with our
calibration kit.
The green DL1 LED on the electronic board flashes to indicate detector status as illustrated in
the table below.
LED DL1 (green) shows the detector's operative status (mS= milliseconds)
Warm-Up
Flashing 750 mS ON; 250 mS OFF
Fault low
Lit fixed
Allarm 1
Flashing 250 mS ON; 1750 mS OFF
Allarm 2
Flashing 250 mS ON; 250 mS OFF; 250 mS ON; 1250 mS OFF
Allarm 3
Flashing 250 mS ON; 250 mS OFF; 250 mS ON; 250 mS OFF
250 mS ON; 750 mS OFF
Fault high
Flashing 250 mS ON; 250 mS OFF
Normal status
Flashing 1 sec. ON; 1 sec. OFF
2.5) Handheld calibration keypad ST.S/CKD PK
Smart P gas detectors offer a field adjustment for the Zero, Span (response to gas) and the
serial address (for the RS485 bus).
By operating with the handheld calibration keypad, pressing ENTER, ESC, Arrow UP and Arrow
DOWN, the Zero, Span and serial Address shall be accomplished.
The keypad can be connected when the detector is powered ON and operating. Before opening
the detector enclosure, be sure all safety precautions have been considered.
Insert the female connector of the keypad at the edge of the flat cable into the male connector
on the Smart P main board.
Once connected, the keypad will display the gas concentration being measured.

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Adjustments are required whenever either Fault or unjustified Alarms due to environmental
conditions occur (Zero adjustment) or detectors need modifying their response to gas (Span
adjustment).
Span adjustment requires a calibrated gas cylinder, either filled with the same gas the detector
has been calibrated for or a reference gas advised by the manufacturer
For the Zero adjustment, gas detectors are to be in fresh air (without any gas or interfering
compounds) and powered on since 8 hours at least.
Once the routine is over a test with gas is to be made to verify the right working condition.
KEYPAD
Fig. 2.5 a) Connection of the calibration keypad

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Calibration keypad menu
0,0
ZERO SPAN VER ADR
ENT
ENT ENT ENT ENT
ESC
0,0 0,0 0,12 001
rES
ENT
WAIT
Fig. 2.5 b) Calibration keypad main menu
ZERO
When the detector SMART P is turned On for the first time, or when a new kit sensor is
mounted into the instrument, the AUTO ZERO calibration is recommended. This action
has to be done under the following two conditions:
Gas detectors are to be in fresh air (without any gas or interfering compounds) and
powered on since 8 hours at least. Where there is no such certainty of being in clean air
(without gas), calibration Auto zero is necessary to use a special mixture of synthetic air
(79% nitrogen and 20.9% oxygen).
Once the routine is over a test with gas is to be made to verify the right working
condition.
Perform the task of Auto Zero Smart P detector simply by pressing ENT from Auto Zero
menu and follow the steps in the block diagram.
SPAN
The Span allows the instrument calibration and is to be executed if when tested in gas occurred
that the instrument is not properly calibrated. To run the Span is essential the use of a mixture
(cylinder) gas sample with the Target Gases (gas that the tool should detect) or with a reference
gas to which the sensor is sensitive.
To apply the mixture of gases sample at Smart P, Sensitron makes available a dedicated
calibration kit. The calibration KIT, supplied with a carrying case, comprises the necessary
instrumentation to verify in situ the response of Sensitron's gas detectors The calibration cap
can be fitted on all of Sensitron sensing heads by employing, when necessary, the endowed
adaptors.

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Both gaskets and screw threads inside the cap allow an optimum tightness between the sensing
head and the cap. The analysis chamber inside the calibration cap has been designed and
realized to obtain a test method identical to that adopted in our laboratory for the initial factory
calibration.
The valve complete with flow meter is to be mounted on the gas can to allow a gas outlet at a
controlled velocity to obtain accurate data to verify the sensing element status.
rES Reset
Reset of Fault status
VER Version
Detector firmware version
ADR Address
Address of detector for communicating to RS485 bus. Ex. 004

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0,0
ENT
SPAN
ENT
VER
ENT
ADR
ZERO
ENT
ZGL
000,0
0,0
DONE
SGL
200,0
FACT
YES
ZGL Concentrazione gas
per lo Zero: lasciare a “000,0”
per VB, CO, NO ed No2
ZGL Zero Gas Level: let to
“000,0” for VB, CO, NO
and No2
ENT
ENT
ENT
Indicazione del valore attuale
letto dal rilevatore. Per azzerare
lo strumento confermare con ENT
Real time value indication. To
make the Zero adjustment,
confirm by ENT
Taratura di Zero eseguita
Zero adjustement done
SGL: Concentrazione gas
per la taratura della sensibilità.
Inserire il valore della concentrazione
gas della bombola usata
(es. 200 ppm CO)
SGLSpan Gas Level: Gas Level
for the detector sensivity adjustement.
Enter the gas concentration of the
gas bottle used
FACT: fattore relativo nel caso
venga usato un gas di riferimento per
la taratura della sensibilità.Altrimenti
selezionare YES
FACT: Coefficent Factor, to be used
in case a difference reference gas
is used, for the sensivity adjustement.
Otherwise select and confirmYES.
0,0
195,0
A questo punto far fluire allo strumento
il gas di taratura, l’indicazione aumenterà
fino a fermarsi al valore massimo
(in circa 30 secondi).
Premere ENT per confermare.
L’indicazione visualizzata sarà ora
quella della concentrazione del gas di
taratura.
200,0
DONE
0.0.12 004
rES
ENT
WAIT
Fig. 2.5 c) Handheld keypad operation flow chart

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The information in this document are not binding for the
manufacturer and the manufacturer reserves the right to make
any changes deemed helpful in improving the product.
For further informations, please contact:
Sensitron S.r.l.
Tel: [phone]
Fax: [phone]
e-mail: [email protected]