sensitron SMART P Gas Detector for Car Parks User Manual

SMART P
Gas Detector for Car Parks User Manual

SMART P Gas Detector for Car Parks

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 us regarding this equipment prior to use or for any additional information relative to use or repair.

Introduction

SMART P gas detectors are used to detect the presence of combustible (%LFL) and toxic (ppm) gases in non classified areas. It has been especially designed and tested according to the European Standard EN 50545-1 for carbon monoxide, nitrogen dioxide and petrol vapours detection in underground car park applications. The catalytic sensor employed for the detection of flammable compounds offers a great precision and selectivity, thus avoiding false alarms. The electrochemical cells employed for the detection of toxic gases allow the measurement of toxic compounds at very low concentrations. SMART P gas detectors provide a serial RS485 output. To check the detector’s calibration use the calibration keypad STS/CKD+ or STS/CKD-OLED.
To protect and increase the stability and accuracy of the gas detector, the microprocessor present on the internal electric circuit board, is programmed with the following software algorithms:
I. Self diagnostic procedure to control the detector main operational parts, both hardware and sensing element.
II. Zero point tracking to maintain the zero parameter of the sensor apart from possible drifts due to thermal or physical variations of the sensor.
III. Digital filter employed in the digital analysis of the analogue values sampled. It is designed to prevent the effects of transients, which may cause instability or incorrect readings with possible false alarms.
IV. Hysteresis cycle applied to the digital outputs to eliminate continuous switching close to the preset alarm thresholds.
V. Watch-dog for the microprocessor control. In case of intervention, the RS485 output communication will be interrupted, while the red LED stops blinking and remains on.
Table 1
SMART P gas detectors
1.1 GAS DETECTORS IDENTIFICATION

Table 2
TECHNICAL SPECIFICATIONS
1.2 Technical specifications of SMART P gas detectors

Application| To be used with MULTISCAN++PK 256/128/64/32/16 type units to monitor toxic and flammable gas in car parks and garages (non-classified areas only)
---|---
Sensing element| Electrochemical cell for CO and NO2 Catalytic sensor for Petrol Vapour
Measurement range| Carbon Monoxide 0-300 ppm Nitrogen dioxide 0 – 30 ppm Petrol Vapours 0-100% LFL
Predicted life of the sensing element| Catalytic: 4/5 years Electrochemical cell: 2/3 years
Power supply| 12- 24 Vdc (- 20% + 15%)
Absorption at 12-24Vdc| CO , NO, 34 mA at 24 Vdc
CO + NO, 32 mA at 24 Vdc
CO + Petrol Vapours 63 mA at 24 Vdc
Visual indications| Flickering LED on the PCB
Output| serial RS485 for MULTISCAN++PK
Repeatability| from ±2% to ±5% FS (depending on sensor type)
Accuracy
Warm-up time
Stabilization time
Storage temperature| from ±2% to ±5% FS (depending on sensor type) <120 s
60 min
Catalytic sensor -20 / +60°C
Electrochemical cell: 0 / +20°C up to 6 months
Operating temperature| Catalytic sensor: -20 / +60°C Electrochemical cell: -30 / +50°C
Operating humidity| Catalytic sensor 0 / 95% RH non condensing Electrochemical cell: 15 / 90% RH non condensing
IP Grade| IP55
Cable entrance| 2 x M20
Weight| 250 g
Dimension| Box: 100 x 100 x 52 mm Cover:105.8 x 105.8 x 7.8 mm
Positioning| The sensor head must be mounted downwards

1.3 CERTIFICATION DETAILS
SMART P gas detector has been designed to fulfil the European Standard for gas detection in car parks. It has been certified by TÜV Nord to be in compliance with EN 50545-1 along with MULTISCAN++PK panels.

Installation site prearrangement

Figure 1
SMART P with extension kit 2.1 GENERAL PRECAUTIONS
At the mounting and installation phase, be sure all safety precautions have been considered. Always remember how important the correct positioning of gas detectors is to get the optimum response.
Be careful:
I. Never to install gas detectors close to air intakes or fans causing strong air currents.
II. 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).
III. That detectors are placed in a convenient location for future maintenance and calibration requirements.
2.2 PRECAUTIONS BASED ON THE GAS TO DETECT AND ENVIRONMENTAL INHIBITORS
When preparing the installation site, it is necessary to take into account the nature of the gas to be detected and the presence of chemical agents in the environment:
I. Petrol vapours and NO2 are gases heavier than air and tend to spread downwards; the detector should be placed at 30 cm from the floor to maximise the effectiveness of the detection. CO has a specific weight similar to air’s; it is a very toxic gas and to get a reliable protection, the detector should be placed at the breathing level, approximately 1.50 m above the floor. The CO+PETROL VAPOUR detector comes with an extension kit to mount the Petrol Vapour sensor 30 cm off the ground and the CO head at nose level. Correct detector positioning is essential to ensure prompt and accurate detection.
II. atalytic sensors (Pellistors) offer excellent output linearity up to 100% LFL and have an estimated lifetime of 4 years. Catalytic sensor performance may be altered by the presence of some substances that, when present in the atmosphere being analysed, can considerably change the response of the sensor and even damage it irremediably. The presence of inhibitors or poisons is the most common cause of problems in the gas detection and, for this reason, it is necessary to pay attention in order to avoid any contamination. Among the most common poisons or inhibitors we can list silicones, tetraethyl lead, sulphurous compounds (hydrogen sulphide), chlorinated compounds (carbon tetrachloride), trichloroethylene and halogenated hydrocarbons.

Installation

Warning
It’s strictly recommended the use of personal protective equipment (PPE) during operations inside the enclosure.
3.1 CORRECT MOUNTING
The gas detector is always to be mounted with the sensing element placed downwards. For no reasons at all the enclosure can be drilled. Wall mount the detectors by employing the existing holes.
3.2 MAIN BOARD LAYOUT
Figure 2
Detector circuit layout 3.3 DETECTOR OUTPUT CONNECTION
The connection of SMART P 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. It is also necessary that:
I. 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 Ω. These features can be found in BELDEN cable 9842 or similar (data transmission cable in EIA RS485).
II. Using this wiring, the total length of the line should not exceed 1000 m.
III. 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.
IV. Make sure that a 120 Ω end line resistor is placed at the beginning and at the end (on the last detector or output module) of the bus line by closing JP10 on the base board.
V. For the detectors’ power supply connection, we recommend using a 2-wire cable with suitable section according to the distance and number of detectors.
VI. 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 STS/CKD+ or STS/CKD-OLED keypad to set the detector address. See the specific manual for further details.
Figure 3
Detector connection to RS485 bus lines

Testing and use

4.1 POWER ON
When the detector is powered on, the green LED on the motherboard starts blinking at slow intermittent. After almost two minutes, the green LED flash rate is equivalent to the detector normal working status. Once the warm-up phase is over, the detector works correctly, although the optimal performances will be achieved after two hours.
4.2 TESTING
Detectors are factory calibrated for the specific gas required by the customers. Future adjustment of the pre-set calibration can be carried out by employing the calibration keypad. Testing / initial checking and calibration should be carried out by using a gas mixture in the appropriate range, along with our calibration kit.
In order to execute this operation, the user has to ask for the proper test gas bottle and connect to this the valve with flowmeter. Connect a pipe with adequate diameter, which connects to the calibration adapter for the gas detector. The calibration of the detector is made by handheld calibration keypad. Refer to the specific technical manuals for further information.
4.3 USE
The detector works autonomously and automatically. Once adequately connected, no further operations are required. The flashing green LED on the motherboard indicates the detector’s working condition. During normal status, the LED blinks with the frequency 1s ON – 1s OFF.

Maintenance

5.1 PREVENTIVE MAINTENANCE ROUTINES
Sensitron racommends a check of permance through a test gas with the proper calibration kit. If the gas detector is equipped with an electrochemical cell or a pellistor sensor, the check must be biannual. If required, during these tests perform the Zero and Span calibration. Moreover, Sensitron recommends to perform the same tests when the detector reports a gas reading above an alarm threshold. Test results should be recorded into a suitable book to be shown to the Authority in case of inspection. For further information, refer to the kit calibration manual MT894.
5.2 CORRECTIVE MAINTENANCE ROUTINES
For any anomaly found during the functional test, please check the tests performance as described in paragraph 4. If during the preventive maintenance routine, the detector does not react to the gas it has been calibrated for, please return the instrument to your supplier that on his turn will return it to the manufacturer for repair. It is possible to adjust the calibration parameters by employing the calibration keypad available on request.
5.3 SENSOR HEAD SUBSTITUTION
If necessary, the sensor head can be substituted. The user must ask Sensitron for a proper kit and instructions.

Disassembly instructions

Power the unit off, disconnect the wires on the terminals and dismount the housing from any blocking systems.

Restorations

Restorations are not allowed; the user has to give the entire equipment to the manufacturer with the warranty coupon for repairing oh paragraph 11.

Packing instructions

To grant a stout protection against impacts we recommend using the original package or protect the device with bubble wrap sheets.

Accessories

Table 3
Table of available accessories that can be purchased separately. Please contact Sensitron for further information.

sensor head

Instructions for disposal

When the device reaches the end of its life, it should be disposed of in accordance with local waste management requirements and environmental legislation. Employed materials are subdivided into the following categories:
I. Detector enclosure: Plastic
II. Sensor head enclosure: stainless steel
III. Base board: Waste Electrical & Electronic Equipment (WEEE)
IV. Sensing element: Waste Electrical & Electronic Equipment (WEEE)
Sensitron has a policy of continuous development and improvement of its products. As such the specification for the device outlined in this document may be changed without notice. In case of modification of the product, Sensitron disclaims all liability. Data may change, as well as legislation and you are strongly advised to obtain copies of the most recently issued regulations, standards and guidelines. This publication is not intended to form the basis of a contract. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of Sensitron.

Warranty coupon for repairing

Warranty on Sensitron products is valid two years from the manufacturing date placed on the product and it is extended of one year from the date of the installation on condition that the installation is performed within the first year of life of the product. As proof will be considered the stamp and date of the installer placed on the present coupon which is to be duly kept by the user and returned to the installer in case of any working tests and repairs.
Warning
Please be aware that all perishables installed in our products (sensors, buffer batteries, etc.) benefit only of the warranty conditions stated by the original manufacturer.

• Use one single coupon for every installation date
  Installation date*…………………………..
  Model(s)………………………………………
  Part Number(s)………………………………
  Installer Stamp………………………….
  Installer signature………………………….

A Halma Company
MT3481
Smart P
SENSITRON S.R.L.
All rights reserved
www.sensitron.it
Viale della Repubblica, 48
20007 Cornaredo (MI) – ITALY
+39 0293548155
sales@sensitron.it
sensitron.it
Sensitron S.r.l.
Sensitron S.r.l., Viale della Repubblica 48, Cornaredo (MI)
sales@sensitron.it
TEL. +390293548155 FAX. +390293548089

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