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2. Installation

2.1 Installation

overview

Sperian Instrumentation’s gas detection
systems are fully tested and calibrated
before they leave the factory. Following
installation, Sperian strongly
recommends that full testing and
verification of proper operation be
carried out before the system is placed
in service.

Repair of system components damaged
as a result of improper installation can
be expensive. NXP Gas Detector Head
installation, initial setup, and/or system
modification should only be undertaken
by individuals who are qualified and
authorized to do so. Call Sperian’s
Instrument Service Department at (860)
344-1079 or 800-711-6776 if you need
help or have any questions.

Case and Mounting Dimensions (inches [mm])

Oxygen detector assemblies are available
in both standard (non-explosion-proof) and
remote explosion-proof (XPR) housings.

Toxic gas sensors are available in standard
(non-explosion-proof) housings, and certain
toxic sensors are also available in remote
explosion-proof (XPR) housings.

Remote detector assemblies for
combustible gas are only available in
explosion-proof (XPR) housings.

NXP Gas Detector Heads are equipped to
provide a 4-20 mA output that is used to

communicate with a remotely located
controller or PLC system. Each detector
head also has a built-in LCD readout for
local display of gas type and concentration.
When used in this type of configuration,
power is supplied to the detector by the
controller.

When used as a stand-alone detector,
power can be supplied to the detector
from a standard wall cube that is included
with the detector, or from an external
power supply with an output of 13-30

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Содержание Biosystems NXP

Страница 1: ... Fixed Gas Detector Head Reference Manual Sperian Instrumentation 651 South Main Street Middletown CT 06457 800 711 6776 860 344 1079 Fax 860 344 1068 Part Number 13 345 Version 1 01 10SEP2009 http www biosystems com ...

Страница 2: ...2 ...

Страница 3: ...REFERENCE MANUAL BE READ FULLY UNDERSTOOD AND FOLLOWED Biosystems NXP Reference Manual Sperian Instrumentation Part Number 13 345 Version 1 01 Copyright 2009 by Sperian Protection Instrumentation LLC Middletown Connecticut 06457 All rights reserved No page or part of this operation manual may be reproduced in any form without written permission of the copyright owner shown above Sperian reserves t...

Страница 4: ...10 1 8 Fault Conditions 10 1 9 Remote Sensors 10 1 10 4 20 mA Current Loop 11 1 11 Event Logger 11 1 12 Firmware Upgrades 11 2 Installation 12 2 1 Installation overview 12 2 2 Cautions 13 2 3 NXP Detector Head Environmental Ratings 13 2 4 Siting of detector heads 13 2 5 Wiring requirements 13 2 5 1 Grounding 14 2 6 Output Specifications 14 2 7 External Wiring 14 2 8 Remote Sensor Installation 16 2...

Страница 5: ...22 4 2 4 Accuracy of Toxic and LEL Sensors 23 4 3 Fresh air calibration 23 4 4 Span calibration of Toxic and LEL sensors 24 4 5 Test Mode 25 4 6 Calibration Failures 26 4 6 1 Fresh Air Calibration Failure 26 4 6 2 Span Calibration Failure 26 5 Configuration 28 5 1 Accessing the Setup menu and Submenus 28 5 2 Setup Submenu Flow Chart 29 5 3 Set Date and Time 30 5 4 Set Loop Range 30 5 5 Set Alarm L...

Страница 6: ... 11 Audible Alarm Test 35 7 Service 36 Returning your NXP to Sperian Instrumentation for service or repair 36 Appendices 37 Appendix A NXP Toxic Sensor Cross Sensitivity Data 37 Appendix B Fault Conditions 38 Appendix C Calibration Frequency Recommendation 39 Appendix D Sperian Instrumentation Warranty Gas Detection Products 40 ...

Страница 7: ...ardous area Modification of Sperian Instrumentation Products Any unauthorized modification of any Sperian Instrumentation product may compromise the certification and the safety of the product and may lead to serious personal injury or death Modification of any part or component of a Sperian Instrumentation product requires the express written approval of both the appropriate certification agency ...

Страница 8: ...before further use Failure to check accuracy can lead to inaccurate and potentially dangerous readings 6 A sensor that cannot be calibrated or is found to be out of tolerance should be replaced immediately An instrument that fails calibration may not be used until testing with known concentration test gas determines that accuracy has been restored and the instrument is once again fit for use 7 Do ...

Страница 9: ...y sent to the controller The NXP Gas Detector head may be installed at a substantial distance from the controller The maximum distance between the head and the controller is 2000 feet when using the proper cable Wiring requirements are discussed in detail in section 2 5 1 3 Sensor options NXP Gas Detector Heads can be configured to detect a number of different atmospheric hazards Each NXP uses a s...

Страница 10: ...Figure 2 5 Once powered up and running the NXP is intended for continuous monitoring If it is necessary to power down the NXP power should be removed from the wall cube or controller that is supplying power to the NXP 1 7 Alarms and Alarm Logic NXP Gas Detector Heads have been designed for the detection of dangerous atmospheric conditions An alarm condition indicates the presence of a potentially ...

Страница 11: ... and the audible alarm will sound Any external devices controlled by means of the NXP s alarm relay contacts will also be activated Latching Alarms NXP alarms are normally self resetting When readings drop back below the pre set alarm levels the instrument returns to normal operation and the alarms and relay contacts are turned off It is possible to set NXP s alarms so that they latch During latch...

Страница 12: ...ntacts can be used to operate external alarms or larger relays that drive other equipment such as ventilation systems See Figure 2 5 for relay connection locations The relay contacts in the NXP do not supply power to the external accessories They act as switch contacts only External alarms relays and contactors require their own power supplies The maximum rating of the NXP s relay contacts is 30 V...

Страница 13: ...s data associated with alarm conditions Each event alarm includes the following data Event Start time Event End time Duration of the event Minimum reading during event Maximum reading during event Average reading during event Temperature at end of event Sensor type Flags for In calibration warning alarm danger alarm and temperature alarm during event Time event was acknowledged The NXP stores the ...

Страница 14: ...s inches mm Oxygen detector assemblies are available in both standard non explosion proof and remote explosion proof XPR housings Toxic gas sensors are available in standard non explosion proof housings and certain toxic sensors are also available in remote explosion proof XPR housings Remote detector assemblies for combustible gas are only available in explosion proof XPR housings NXP Gas Detecto...

Страница 15: ... than air may collect There are many circumstances that may modify this general advice It is beyond the scope of this manual to attempt to describe all of the potential situations that could cause this advice to be modified but a single example follows The molecular weight of nitrogen MW 28 is very close to that of air MW 29 When nitrogen is at the same temperature as the air into which it is intr...

Страница 16: ...ading 100 LEL or a full scale oxygen or toxic gas reading The NXP is shipped in Source Mode meaning it acts as the source of the loop current It can be switched to Sink Mode if necessary by moving the jumper from J10 to J9 on the communication board and connecting the signal wire to pin 2 instead of pin 3 on J1 see Figure 2 5 When used as a stand alone instrument whether powered by a wall cube or ...

Страница 17: ... PCB Reinstall the electronics assembly and push until it is fully seated against the standoffs to which it mounts 8 Apply power to the NXP and ensure correct operation Make sure the cover gasket is seated close the cover and tighten the cover screws securely Figure 2 5 NXP detector wiring diagram ...

Страница 18: ...ing Do not tighten the nut yet Connect the cable to the PCB connector where the sensor cable was removed Be sure to observe the correct polarity when connecting the cable When it is connected replace the electronics assembly in the housing pushing firmly so that it seats on its mounting points Make sure that there are a few inches of slack in the cable inside the housing and then tighten the strai...

Страница 19: ...the conduit to the location of the remote sensor Inside the sensor connection box connect the cable to the sensor connector observing the polarity of the connectors Close the connection box and tighten the cover securely Make sure any required conduit seals are in place Apply power to the instrument and check for proper operation Figure 2 8 Non explosion proof remote sensor assembly ...

Страница 20: ...ven in either percent LEL LEL or percent volume methane CH4 3 1 Modes of operation Press the MODE button to scroll through the screens The current gas reading screen is shown during normal operation Detector heads equipped with toxic gas sensors will display gas readings in parts per million PPM Some sensors will resolve readings to tenths of a part per million Detector heads equipped with oxygen ...

Страница 21: ...ion Due Warnings When the NXP is due for calibration the triangular warning symbol is shown in the current gas readings screen and the calibration icon and green LED will blink In addition every 30 seconds the CAL dUE reminder will appear on the display and the red LEDs will flash 3 2 Clearing the MAX reading If it becomes necessary to clear the MAX reading press and hold the MODE button for 4 sec...

Страница 22: ...ially poisoned LEL sensor might still respond accurately to propane while showing a dangerously reduced response to methane Sperian s Propane Equivalent calibration gas mixtures have been developed to eliminate this potentially dangerous source of calibration error Sperian s Propane Equivalent mixtures are based on methane so any loss of sensitivity to methane is detected and can be corrected imme...

Страница 23: ...r by pulling it straight out of the housing do not twist If the sensor did not come out with the collar remove it separately 4 Notice the small hole on the end surface of the collar Re insert the collar lining up the hole with the pin on the sensor adapter board Make sure the collar is fully inserted 5 Line up the key on the new sensor with the slot in the collar and push the sensor into the colla...

Страница 24: ...or head during calibrations and bump tests For detector heads that are used as part of a detection system with a controller it is necessary to calibrate both the controller and the gas detector head when the system is first put into use Once the system has been properly calibrated the accuracy of the gas detector head should be regularly verified by exposure of the sensor to known concentration te...

Страница 25: ...ven on the gas cylinder If readings are accurate then the instrument requires no further adjustment Toxic and LEL readings that do not fall between 90 and 120 of the value on the cylinder are considered inaccurate and indicate that the sensor must be calibrated before further use as discussed in sections 4 3 and 4 4 4 3 Fresh air calibration As discussed in section 4 2 2 fixed systems are often us...

Страница 26: ...l Connect the cylinder with the span calibration gas to the detector and flow gas to the sensor Customers are strongly urged to use only Sperian calibration materials when calibrating the NXP Use of non standard calibration gas and or calibration kit components when calibrating the NXP can lead to inaccurate and potentially dangerous readings and may void the standard Sperian warranty The expected...

Страница 27: ...test While the instrument is in Test Mode it will not go into alarm despite the fact that the instrument may detect levels of gas that exceed the alarm threshold For detectors that are used with a controller during Test Mode the detector will send a signal to the controller that mimics a fresh air reading to keep the controller from registering an alarm condition While in test mode the green and y...

Страница 28: ...y void the standard Sperian warranty Sperian Instrumentation offers calibration kits and long lasting cylinders of test gas specifically developed for easy NXP calibration Press MODE to end the test and resume normal gas reading mode The detector will then return to the current gas reading screen The warning icon will be lit to show that the alarms are off until the readings fall below the alarm l...

Страница 29: ... cylinder is different from the instrument s calibration gas setting the calibration gas setting must be changed to match the new value or the correct value calibration gas must be obtained Calibration gas value can be changed by accessing the setup menu with the MODE button as discussed in section 5 5 LEL only Wrong type of combustible calibration gas LEL calibration gas may be based on several d...

Страница 30: ...eading screen The operating logic in the submenus is the same as the operating logic in the main menu In each of the submenus press the MODE button to go deeper into the submenu or to make changes Do nothing to move on to the next submenu item without making changes Once the final item in a submenu is reached the NXP will return to the next higher submenu 5 1 Accessing the Setup menu and Submenus ...

Страница 31: ...ormation Enter Setup Menu Back to gas reading Set Date Time see 5 3 Set Loop Range see 5 4 Set Alarm Levels see 5 5 Set Alarm Latch see 5 6 Set Combustible Sensor Display see 5 7 Set Calibration Gas Level see 5 8 Set Calibration Interval see 5 9 Set Bump Test Interval see 5 10 After the Bump Interval menu the display will return to the current gas reading ...

Страница 32: ...ecalibration of the instrument Changing the loop range will affect the operation of any attached 4 20 mA controller Range adjustment or recalibration of the controller may be necessary 5 5 Set Alarm Levels 5 5 1 Setting alarms for Toxic and Combustible gas sensors Toxic and combustible gas sensors have both Warning Wn and Danger dnG alarm levels They can be set equal to each other but the Warning ...

Страница 33: ... oxygen the Low Danger and Warning alarms must be set to OFF before the High Danger and Warning alarms can be set to the low values 5 6 Set Alarm Latch Press the MODE button within 5 seconds to view the current alarm latch setting Use the MODE switch to toggle the latch between on and off 5 7 Set Combustible Gas Sensor Display The NXP can display combustible gas level in either LEL or CH4 by volum...

Страница 34: ...ntdown for the final menu option if the MODE button is not pressed the NXP will return to the current gas reading screen 6 1 Accessing the Diagnostics menu and Options To access the Diagnostics Menu press and hold the MODE button The current gas reading screen will be replaced with the MAX Clr screen after about 3 seconds Continue to hold the button In a few more seconds Set will be shown Continue...

Страница 35: ... View Sensor Temperature Display see 6 5 Test 4 20 mA Current Loop Output see 6 6 Test Local Relays see 6 7 Test Local 12 Volt Output see 6 8 Test LCD Segments and Backlight see 6 9 Test LEDs see 6 10 Test Audible Alarm Output see 6 11 After the Audible Alarm option the display will return to the current gas reading ...

Страница 36: ...ress will show the power supply voltage Press the MODE button to exit 6 5 Sensor Temperature Display The next menu option is the sensor temperature reading The display will show the temperature at the sensor 6 6 Current Loop Output Test The next menu option is the Current Loop Output Test This test applies a set of output currents to the 4 20 mA loop so that the connection between the NXP and a co...

Страница 37: ...t Test The next option is the LCD test This test will alternately show LCd and all segments of the LCD while also turning the LCD backlight on and off 6 10 LED Test The next option is the LED test This test will show LEd on the display and alternately flash the yellow LEDs and the red LEDs 6 11 Audible Alarm Test The next option is the Audible Alarm test AUd and ALr will alternate on the display a...

Страница 38: ...inal NXP packing materials or other packing materials that similarly protect the instrument and accessories Please contact the Sperian Instrumentation Service Department at 860 344 1079 or 800 711 6776 if you require any additional information Note The return authorization number must be clearly marked on the outside of the box Prominently showing the return authorization number on the outside of ...

Страница 39: ...r the effect can either decrease the signal negative cross sensitivity or increase the signal positive cross sensitivity Each figure represents the reaction of the sensor to 100 ppm of gas thus providing a percentage sensitivity to that gas relative to its target gas Type of Sensor Interfering Gas CO H2S SO2 NO NO2 Cl2 H2 HCN HCl NH3 C2H4 Carbon Monoxide CO 100 10 5 20 15 10 50 15 3 0 50 Hydrogen ...

Страница 40: ...ooted if this fault occurs If the fault persists the instrument should be initialized see Section 7 F5 EEPROM Write Fault This fault occurs when the instrument encounters an error while trying to write to the EEPROM that stores the instrument configuration data The instrument must be rebooted if this fault occurs If the fault persists the instrument should be initialized see Section 7 F11 Power Lo...

Страница 41: ...ntation recommends the following procedure to establish a safe and prudent accuracy check schedule for your Sperian instruments 1 During a period of initial use of at least 10 days in the intended atmosphere check the sensor response daily to be sure there is nothing in the atmosphere that is poisoning the sensor s The period of initial use must be of sufficient duration to ensure that the sensors...

Страница 42: ...PRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND REPRESENTATIONS EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO THE WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE SPERIAN WILL NOT BE LIABLE FOR LOSS OR DAMAGE OF ANY KIND CONNECTED TO THE USE OF ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR OPERATE PROPERLY Instrument Accessory Warranty Periods Product s Warranty Period Biosystems EXP NX...

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