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monitors the pressure created by the flow from the pump and the restriction
created by the orifice. Should pressure fall, a flow failure is detected, and signal
is sent to the electronics.

Figure 2 Pneumatics Diagram

Infrared Bench:

Refer to the figure 3 for Infrared Bench diagram. The infrared

bench  has  an  integrated  source  circuit  with  infrared  source  at  one  end  and  an
integrated  detector  circuit  with  filter  and  detector  at  the  other.    Presence  of
refrigerant in the sample air will cause a change in the output of the detector.

Figure 3 Infrared Bench

Control Electronics:

Refer to the figure 4 for control electronics block diagram.

The  signal  from  the  infrared  bench  is  analyzed  by  the  control  circuit  and
converted into a digital measurement in ppm (parts per million).  The ppm level is
compared to trip points set for Low, Main and High alarm levels.  If the ppm level
exceeds the Low alarm threshold, the “Leak Wait” algorithm is used to determine

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Содержание IR-SNIF-1

Страница 1: ...SenTech Corporation 5745 Progress Road Indianapolis Indiana 46241 888 248 1988 FAX 317 248 2014 INSTALLATION AND OPERATION MANUAL ENVIRONMENTAL SYSTEM IR SNIF SINGLE ZONE MONITOR MODEL IR SNIF 1 2 3 ...

Страница 2: ...2 3 press the key This will display momentary screens that provide contact information for SenTech Corporation the software version and any options enabled in the monitor If your monitor has a version that is older than 4093 smaller version number such as 3017 a version specific appendix A Programming and Operator Interface is available It can be downloaded from the SenTech Corporation website www...

Страница 3: ... PROGRAMMING 14 Apply Power 14 Initial Screens 14 Normal Operation 15 Initial Programming 15 FINAL TESTS 21 Monitor Sequencing 21 Integration with External Devices 21 Response to Refrigerant 22 End to End System Test 24 Documentation 24 PREVENTIVE MAINTENANCE REPAIR 26 Preventive Maintenance 26 Commonly Ordered Parts 26 Monitor Repair 26 APPENDIX A Programming and Operator Interface 27 Summary 27 ...

Страница 4: ...hat the terminal must be connected to earth ground before operation of the equipment Caution This sign calls attention to a procedure or practice which if not adhered to could result in damage or destruction to a part of the product Other information and precautions Input Power Power should be supplied through a two pole circuit breaker located in a reasonable proximity to the equipment Ensure tha...

Страница 5: ...pa Equipment rated for indoor use only Range 10 1000 ppm Standard Tube Length 0 250 ft 0 76 m Trip Point Low Alarm 0 1000 ppm Main Alarm 0 1000 ppm High Alarm 0 1000 ppm Leak Wait Varies from seven 7 seconds to three 3 minutes depending on refrigerant concentration Alarm Output Low Main and High alarm relays each with four 4 form C contacts rated 5 amps maximum Analog Output 0 10 volt proportional...

Страница 6: ...ect the environment Functional Description The refrigerant monitor is composed of four major functional blocks Pneumatics Infrared Bench Control Electronics and Power Supply Refer to figure 1 for an overall block diagram Figure 1 Overall Block Diagram Pneumatics Refer to the figure 2 for pneumatics block diagram Tubing from the area to be monitored and from a reference air source either fresh outs...

Страница 7: ...integrated detector circuit with filter and detector at the other Presence of refrigerant in the sample air will cause a change in the output of the detector Figure 3 Infrared Bench Control Electronics Refer to the figure 4 for control electronics block diagram The signal from the infrared bench is analyzed by the control circuit and converted into a digital measurement in ppm parts per million Th...

Страница 8: ...ill remain in that mode until the problem is cleared and the system is reset Figure 4 Control Electronics Diagram Power Supply Refer to the figure 5 for Power Supply diagram Power is supplied to the monitor through terminals 1 2 and 3 of the terminal board Line voltage is fed through the fuse on the left side of the monitor not shown and to the diaphragm pump and power supply The power supply conv...

Страница 9: ...gnal then also in the sample The ppm level is based on the ratio of the sample to the reference This ratio eliminates the effect of any variations and eliminates the need to periodically calibrate a monitor in the field PPM vs Leak Rate The relationship between the actual amount of product lost and the resulting ppm level refrigerant in the air is complex There is no direct relationship between th...

Страница 10: ...ntech Corporation for assistance Identify Location for Monitor Sample Points and Alarms Monitor Location ASHRAE 15 specifies that the refrigerant monitor is to be located in the mechanical room There are two interpretations of this the unit itself is to be installed in the mechanical room or the sample point is to be located in the mechanical room Because the IR SNIF 1 2 3 is an active air draw mo...

Страница 11: ...f the fresh air reference is routed outdoors the following criteria should be used 1 The tube end filter must be protected from the elements Water ice or insects can partially obstruct the tube end filter and change the reference signal 2 The tube end filter must be located such that it can be inspected as part of the recommended quarterly preventive maintenance 3 The tube end filters must not be ...

Страница 12: ...l or Common to TB1 3 Caution Verify that the monitor is designed for the appropriate line voltage Connection of the incorrect voltage will damage the unit It is strongly recommended that power be supplied from a two pole circuit breaker located in reasonable proximity to the system Power MUST NOT be supplied by plugging into a wall socket The unit is a continuous monitor and as a continuous monito...

Страница 13: ...4 Caution Ensure that external relay connections do not touch relay control terminals 7 and 8 A short circuit from the exhaust fan wiring to the relay control wiring could damage the monitor the alarms or both Fan to Relay Connection The IR SNIF 1 2 3 monitor alarm relay can support a load of up to 5 amps at line voltage The typical high speed exhaust fan will have a startup current in excess of t...

Страница 14: ... optional remote analog display at the entrance to the room This signal could be used to provide an analog input to building management systems for remote monitoring of the ppm level and for trending of levels This signal should NOT be used as a replacement for discrete alarm relay connections to a BMS Analog output connections are as follows 1 Use twisted pair wire for analog 1 connection or four...

Страница 15: ...5 Remote Control Panel Interface the RS 485 interface allows for complete remote control and monitoring of multiple refrigerant monitors in the same facility To identify whether a monitor has rs 485 interface installed examine the control board installed on the door of the monitor Locate the connectors labeled P6 and P8 Connector P6 is located on the upper left corner of the board as you look at t...

Страница 16: ...al optional inputs or outputs The control circuit in the monitor is versatile and can accommodate additional analog or discrete measurement and control signals This circuit also has the capability to provide additional discrete control signals Please contact SenTech Corporation technical support to determine whether specific requirements can be provided ...

Страница 17: ...ay this screen on initial application of power Following memory initialization the monitor will display the copyright screen The monitor will next display two Contact and Model Information screens Note these screens can be accessed anytime during normal operation by pressing the key Following display of the contact and model information screens the IR SNIF 1 2 3 will restore any alarms that have b...

Страница 18: ...g the time of day and the refrigerant programmed for the sample area Initial Programming Once the IR SNIF 1 2 3 has completed warm up and entered Auto Zero it can be programmed While in Auto Zero or Auto Sample modes press the ENT key to access the main menu Key selections 1 2 and 3 are used to display current alarms manually initiate Auto Zero and enter the Manual Override mode These functions ar...

Страница 19: ...fault configuration Increasing this number will allow the monitor to skip the autozero cycle if the raw measurement from the IR Bench has not changed significantly That is if the raw signal varies by less than plus or minus 10 millivolts and the autozero flag is set to 10 the monitor will not perform an autozero cycle NOTE This is effectively reducing the extreme low level sensitivity of the monit...

Страница 20: ...l falling Set this flag to the factory default of 50 if no large levels are expected Set this flag lower if large levels are expected Press the ENT key to move the cursor to the TWA ALARM flag This flag is reserved for future implementation of TWA measurement This flag should be left at the factory default of 0 Press the ENT key to move the cursor to the FULL SCALE flag This flag is used to adjust...

Страница 21: ...more than one alarm level is provided the additional alarms may be self resetting Care must be used when implementing this feature as the alarm level that corresponds to the ASHRAE 15 required alarm MUST be a latching alarm If there are any questions regarding the correct implementation of this feature call SenTech technical support Press the ENT key to move the cursor to the next entry When all e...

Страница 22: ...e and the Low Main and High alarm thresholds for each sample area Note that different settings can be programmed for each area and that every area must be programmed for proper operation The first setup screen will display 1 to enter parameters or 2 to enable or disable sample areas Press the 1 key to setup parameters for each area Press the left or right arrow keys to change from one sample area ...

Страница 23: ...xposure level These are recommended settings only Refer to local codes and regulations for the appropriate settings for a given application Once the gas code distance and alarm settings have been entered press the ABORT key to return to the Setup Menu If any of the available sample ports are not used press the 2 key to enter the enable disable screen Press the left or right arrow keys to change fr...

Страница 24: ...e are no other sources of halogen vapors in the room contact SenTech technical support Integration with External Devices Once a monitor has been connected to external alarms fans and building systems integration can be checked using the Alarm test function of the monitor The Alarm test screen is found in the System Setup menus described previously in the start up and programming section of this ma...

Страница 25: ...ease an amount of refrigerant into the environment through the exhaust port of the monitor Caution Follow all national and local codes for safe handling of refrigerants Because the IR SNIF 1 2 3 is factory calibrated and no field calibration is necessary the refrigerant sample is not required to be of a known level A calibrated test gas kit is available from SenTech Corporation should the user des...

Страница 26: ... on the front panel display of the monitor Press the 3 key to enter Manual Override Place the 1 4 inch tube into the sample container and connect it to the sample inlet to simulate a concentration of refrigerant in the air Caution Never connect a pressurized refrigerant bottle directly to the monitor The unit is designed to operate only at atmospheric pressure Doing so can damage the unit After ap...

Страница 27: ...al correct operation When a relay is programmed for an audible alarm and energizes the external horn should sound if so equipped and the bottom line of the display should change to RESET to Silence This instructs the operator to push the RESET key to silence the Horn If the Horn has been silenced the fourth line of the display should change to RESET to Clr Alarms This instructs the operator to cle...

Страница 28: ...s now complete The unit should be on line and monitoring The remainder of this manual includes further information on operational characteristics programming preventive maintenance troubleshooting parts lists and a detailed wiring diagram ...

Страница 29: ... the filters Quarterly Performance Check Once per quarter perform the End to End system test described in the Final Checks Procedure on page 12 Commonly Ordered Parts P N Description 422050 Filter 1 2 3 Coarse Tube 410136 GRAY Orifice 016 410224 Diaphragm Pump Monitor Repair Most monitor repairs can be performed in the field by the typical service technician Refer to the Troubleshooting Guide foun...

Страница 30: ...opyright The Copyright screen will be displayed on completion memory initialization Contact Screens The Contact Screens display the company name phone number and website After a short pause a second screen is displayed to identify the Model Version and Options installed in the software of the monitor Optics Warm Up The Optics Warm Up Screen is displayed while the monitor is stabilizing internal te...

Страница 31: ...ill instruct the operator to press the RESET key to silence the horn If the monitor is in alarm the fourth line will instruct the operator to press the reset key to clear alarms Leak Wait When the monitor is in Auto sample mode and first senses a change in PPM it enters Leak Wait mode This ensures the monitor truly detects a leak before activating the Low Alarm relay and the Main Alarm relay The l...

Страница 32: ...e is useful to temporarily measure without processing alarms It displays the ppm level the refrigerant and the current time Alarm processing is suspended during Manual Override Manual Override mode is entered by via the menus described later in this document Menu Screens The Menu Screens can be accessed from any Operational Screen by pressing the ENT or enter key In the first menu the operator is ...

Страница 33: ...yed if the monitor detects a flow failure Rezero The monitor can be switched into Auto zero Mode manually by pressing the 2 key On completion of the manually initiated Auto zero the unit will return to normal operation Manual Override The monitor can be switched into Manual Override mode manually by pressing the 3 key The unit will return to normal operation if the ENT enter key is pressed or afte...

Страница 34: ... refrigerants Once the appropriate gas is displayed press the ENT key to move the cursor from line two to line three As of January 1 2003 the standard IR SNIF monitor is capable of detecting and responding to the following list of refrigerants R 11 R 12 R 13 R 22 R 113 R 114 R 123 R 134A R 401A R 401B R 402B HP81 R 404A HP62 R 407A AC9000 R 408A R 409A R 410A AZ20 R 500 R 502 R 503 R 507 AZ50 Ente...

Страница 35: ... screens The system flag screen will display information for five settings displayed on two screens Press the ENT key to move the cursor from one line to the next and press the left arrow key to move from one line to the previous Autozero Flag The autozero flag can be used to limit the frequency of autozero cycles It can be set between 0 and 100 If a 0 is entered the monitor will enter an autozero...

Страница 36: ...flag is set to 1 by default Press the ENT key to move the cursor to the next entry When all entries have been viewed press the ENT key again to display the second system flag screen Slope Flag The slope flag is used for circumstances where an individual zone might be exposed to large levels of refrigerant This flag will hold the monitor in its current mode whether it be autosample or autozero if t...

Страница 37: ...resetting or are latched If the LATCH FLAG is set to 0 the alarms will function as a conventional latching alarm If the LATCH Flag is set to 1 the LOW and MAIN alarms will function as self resetting alarms The HIGH alarm will always be a latching alarm NOTE The ASHRAE 15 standard specifies that an alarm relay must be latched but that if more than one alarm level is provided the additional alarms m...

Страница 38: ...PM enter the hour as 14 rather than 2 When the date and time have been entered press the ENT key to return to the system setup screen Trending The Trending screens enable the end user to track measured levels over time This feature will be helpful in isolating low level intermittent alarms Trending currently saves the peak ppm level measured in each zone periodically at a user defined rate and tim...

Страница 39: ...59 For Weekly trend rate the monitor will request Day of week 0 6 Hour 0 23 Minute 0 59 For Daily trend rate the monitor will request Hour 0 23 Minute 0 59 For Hourly trend rate the monitor will request Minute 0 59 ...

Страница 40: ...5 is virtually unpredictable therefore in all calculations it is assumed that the leaking refrigerant will expand to fill the room with an even distribution of refrigerant This assumption will yield safer conservative calculations If the monitor sample and reference locations have been appropriately chosen the monitor will see a higher concentration than calculated from the ideal formulas Formula ...

Страница 41: ...cessary to cause a measurement of 25 ppm Given air turnover of 100cfm calculate the fresh air volume in cuft hr Air flow cuft hr air flow cfm x 60 min 1 hr Air flow cuft hr 100cfm x 60 min hr 6000 cuft hr Given 6000 cuft hr calculate the leak rate that is required to maintain a measurement of 25 ppm Leak rate min cuft hr parts per million million x fresh volume cuft hr Leak rate min cuft hr 25 ppm...

Страница 42: ...fore in all calculations it is assumed that the leaking refrigerant will expand to fill the room with an even distribution of refrigerant This assumption will yield safer conservative calculations If the monitor sample and reference locations have been appropriately chosen the monitor will see a higher concentration than calculated from the ideal formulas Formula Definitions ppm refrigerant concen...

Страница 43: ...cessary to cause a measurement of 25 ppm Given air turnover of 225cubic meter hr calculate the leak rate that is required to maintain a measurement of 25 ppm Leak rate min cubic meter hr parts per million million x fresh volume cubic meter hr Leak rate min cubic meter hr 25 ppm 1 000 000 x 225 cubic meter hr Leak rate min cubic meter hr 005625 cubic meter hr Given 005625 cubic meter hr calculate t...

Страница 44: ...9 410136 Gray Orifice 016 not shown 10 422010 IR Bench IR SNIF 1 2 3 11 422031 Control Board 12 421036 Display not shown 13 421031 Keypad IR SNIF MCD and IR SNIF 1 2 3 not shown 14 422040 Socket Relay IR SNIF 1 2 3 15 422087 Relay 24VDC IR SNIF 1 2 3 16 421072 Terminal Board 8 Position 17 410033 Fuse Holder not shown 18 410034 Fuse 3A not shown 19 422036 Power Supply Triple Output Figure C1 Parts ...

Страница 45: ...1 24 AWG White rs 485 Transmit optional 16 TB1 7 A1 P8 3 24 AWG White Analog 2 16 TB1 7 A1 P6 3 24 AWG White rs 485 Ground optional 17 TB1 8 A1 P8 4 24 AWG White Analog Ground 17 TB1 8 A1 P6 4 24 AWG White rs 485 Receive optional 18a TB1 1 BOX GND 22 AWG Green Yellow Earth Ground 18b TB1 1 PS GND 22 AWG Green Yellow Earth Ground 19 TB1 2 F1 1 22 AWG Black AC Line In 20 TB1 4 F1 2 22 AWG Black Fuse...

Страница 46: ... control board Another light should be lit in the center right area of the board This will be either the red light labeled RYL5 or RLY6 Following Optics Warm up the controller will alternate between RLY6 fresh air and RLY5 sample air at approximate two minute intervals If no power lights are lit there is a DC power fault If the power lights are lit but the neither RLY5 nor RLY6 are lit or the cont...

Страница 47: ...ating and replace if it has failed b Check that the tubing inside the monitor has not come loose from any fitting or become kinked at any point c Check that the orifice or tube end filter have not become clogged or restricted d Check that the tubes connected to the sample air inlet and fresh air inlet have not become clogged or restricted e Check that the solenoid valves are switching Verify that ...

Страница 48: ...endix A b Verify that the alarm settings are not set too low Refer to Startup and Programming section of this manual for instructions c Inspect the area for the presence of halogenated organic chemicals Some degreasers and cleaning agents are made of organic chemicals containing chlorine fluorine or bromine Such chemicals might cause an alarm d Inspect the area for oil leaks Oil can contain trace ...

Страница 49: ...ual or has been subject to misuse alteration accident damage during transit or delivery or that such part is from a machine on which the serial number has been altered or removed then this warranty is void and of no further force or effect All decisions regarding the existence of defects in material or workmanship or other causes shall be made by SenTech s Factory Representative and shall be final...

Страница 50: ...47 05 20 2008 ...

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