SenTech IR-SNIF-1 Installation And Operation Manual
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SenTech IR-SNIF-1 Installation And Operation Manual

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

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  • Page 1 INSTALLATION AND OPERATION MANUAL ENVIRONMENTAL SYSTEM IR-SNIF SINGLE ZONE MONITOR MODEL IR-SNIF-1,2,3 SenTech Corporation 5745 Progress Road Indianapolis, Indiana 46241 888/248-1988 FAX 317/248-2014...
  • Page 2 Specific details of programming and operator interface apply to software version 5327k and later versions. To determine the version of an IR-SNIF-1,2,3, 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.

  • Page 3: Table Of Contents

    APPENDIX A: Programming and Operator Interface..........27 Summary ........................27 Start-up Screens ......................27 Operational Screens ....................28 Menu Screens......................29 APPENDIX B: SenTech Room Volume Considerations ..........37 APPENDIX C: Parts List and Wire List............... 41 TROUBLESHOOTING GUIDE .................. 43 SenTech Manufacturer's Limited Warranty..............46...

  • Page 4: Safety Precautions And Warnings

    Failure to comply with these precautions, given here and elsewhere in the manual violates safety standards of design, manufacture, and intended use. SenTech Corporation assumes no liability for the customer’s failure to comply with these requirements.

  • Page 5: Model Ir-Snif-1,2,3 Specifications

    Model IR-SNIF-1,2,3 Specifications Size: 10” x 12.5” x 4.75” (25.4cm x 31.2cm x 12cm) Weight: 16 lbs. (7.2 kg) Power: 120 or 240 Volt 50/60hz (41 Watts) (voltage must be specified at time of order) Temperature: 32 deg F – 125 deg F (0 deg C – 50 deg C) Humidity: 0 –...

  • Page 6: Introduction And Overview

    INTRODUCTION and OVERVIEW The SenTech Environmental System IR-SNIF-1,2,3 single zone monitor provides an early warning of developing refrigerant leaks. The unit samples ambient air and measures the amount of halogen based refrigerant gas in the air sample. When the proportion of refrigerant present exceeds a trip point, the system goes into alarm mode.
  • Page 7 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.
  • Page 8 whether the monitor has experienced a transient exposure, or a leak truly exists. If the ppm level remains above the Low alarm threshold on completion of leak wait, the Low alarm relay is energized. If the signal continues to increase, the main alarm relay will be energized and ultimately the high alarm relay.

  • Page 9: Sensitivity To Refrigerants

    Factory Calibration and airflow in the room will all affect the actual concentration at the inlet. The IR-SNIF-1,2,3 is calibrated at However, by judicious location of the the factory prior to shipment. inlets (see installation section) and...

  • Page 10: Installation

    Because the Sentech IR-SNIF-1,2,3 is an active air draw monitor, it can be installed nearly Optional Purchases: The IR-SNIF- anywhere in the vicinity of the area 1,2,3 package may also contain the to be monitored.
  • Page 11 Note be taken in choosing a location. The that the IR-SNIF-1,2,3 has visual fresh air reference tube should be indicators of its alarm status. If the routed to a location that will be free monitor is installed at the entrance to of refrigerant.

  • Page 12: Electrical Power Connection

    Electrical Alarm Connections 1 2 3 4 5 6 7 8 Alarm-to-Relay Connection: IR-SNIF-1,2,3 monitor alarm relay sockets have two sets of NO/NC dry contacts. Refer to figure 7 for a diagram of the relay socket. Figure 6.
  • Page 13 Alarm-to-Relay Connection: typical Alarm connection uses the BMS-to-Relay Connection: common terminal and normally open IR-SNIF-1,2,3 monitor alarm relay (NO) terminal to switch AC line can provide alarm indications to the voltage to the strobe alarm, horn typical building management system alarm or combination horn strobe.

  • Page 14: Other External Connections

    SenTech Corporation recommends signal proportional to the peak ppm the following relay connections for level measured. For applications building management systems: where the IR-SNIF-1,2,3 is installed inside mechanical room, 1. BMS discrete input connected analog 1 signal can be used to drive...
  • Page 15 The IR-SNIF-1,2,3 monitor provides Corporation technical support for an optional RS-485 interface in place assistance. of the analog outputs. This interface is for use with ACC 070 SenTech RS-485 digital connections are as COMM LINK PC to Refrigerant follows: Monitor...
  • Page 16 This circuit also has the capability to Custom Control Inputs/Outputs: provide additional discrete control The IR-SNIF-1,2,3 monitor has the signals. Please contact SenTech capability to be programmed for Corporation technical support additional optional inputs or outputs.

  • Page 17: Startup And Programming

    “*” key.) Initial Screens SenTech Corporation If the IR-SNIF-1,2,3 has never been Phone 1-888-248-1988 programmed, it will access default www.sentechcorp.com memory settings and display the following screen:...

  • Page 18: Normal Operation

    Timer 24 12:00 changed to user-defined codes. 999 cannot be changed. Press ENT for Menu * SenTech Monitor * The Auto Sample measurement will ENTER PASSWORD be taken for between 1 minute and 3 Followed By ENT minutes, depending on the tube Code : length programmed into the monitor.
  • Page 19 When the correct password has move the cursor from one line to the been entered the monitor will display next, and press the left arrow key to the setup screen. move from one line to the previous. The autozero flag can be used to limit the frequency of autozero...
  • Page 20 feature is useful when the user is extremely large level of refrigerant troubleshooting an alarm, and wants has been measured, the monitor to work in silence. Set the horn relay might run in autozero longer than flag to 1 to activate the horn relay expected if the measured level is still falling.
  • Page 21 “ENT” key again to display the third regarding the correct implementation system flag screen. this feature, call SenTech technical support. LOW DELAY Press the “ENT” key to move the MAIN DELAY cursor to the next entry. When all HIGH DELAY...
  • Page 22 PM, enter the hour as 14, rather than Main and High alarm thresholds for each sample area. Note that different settings programmed for each area, and that Program Time/Date every area must be programmed for Month (1-12): 10 proper operation. The first setup Day (0-31): 27 screen...
  • Page 23 25 - Alarm Main AREA <- -> Alarm High Status ENT or ABORT 1-Enable 0-Bypass ENT or ABORT Unless specified otherwise, SenTech Corporation recommends following alarm settings Press the left or right arrow keys to refrigerants except R-123: change from...

  • Page 24: Final Tests

    If there is no leak “RESET” key to de-energize the and there are no other sources of relays. halogen vapors in the room, contact SenTech technical support. Alarm Test 1)…Low 2)…Main Integration with External Devices 3)…HIGH 4)…All RESET To Clear...

  • Page 25: Response To Refrigerant

    Because the IR-SNIF-1,2,3 is factory setup screen. Press the “ABORT” calibrated, and no field calibration is key again to return to normal necessary, the refrigerant sample is operation.
  • Page 26 1/4 inch tube into the sample The 1/4 inch tubing should be long container and connect it to the enough to connect to the sample sample inlet simulate inlet and extend into the bottom of concentration of refrigerant in the air. the sample container.

  • Page 27: End-To-End System Test

    Main alarm and High alarm If you need any additional manuals, at the same time. This is normal, call SenTech and we will be pleased correct operation. to provide them at no charge (make a note of the unit serial number when When a relay is programmed for an requesting a manual).
  • Page 28 operational characteristics, Basic installation and start-up is now programming, preventive complete. The unit should be on line maintenance, troubleshooting, parts and monitoring. lists, and a detailed wiring diagram. remainder this manual includes further information...

  • Page 29: Preventive Maintenance & Repair

    Additionally, SenTech Corporation naturally discolor to a dark bronze provides telephone technical support color. Inspect the filter for obvious for all SenTech refrigerant monitors. clogging build dust. If assistance is needed, call 888- Replace, rather than clean the filters.

  • Page 30: Appendix A: Programming And Operator Interface

    Corporation When power is applied to the Phone 1-888-248-1988 system, it will step through a series www.sentechcorp.com of start-up screens. RESETTING DEFAULTS Model IR-SNIF-1,2,3 Version 3017 Option Code 0 www.sentechcorp.com Optics Warm-Up: The Optics restore from memory Warm-Up Screen is displayed while the monitor is stabilizing internal temperature.

  • Page 31: Operational Screens

    Operational Screens When the monitor completes Start- Up, it will enter Auto zero, and then Auto Sample AREA 1 proceed to measure in Auto sample 12:00 mode. Under normal circumstances R-134A the monitor will cycle from Auto Press ENT for Menu sample to Auto zero, and back to Auto sample.

  • Page 32: Menu Screens

    Main High relays will energized if the measured ppm level Manual Override: Manual Override has exceeded the corresponding mode useful temporarily alarm levels. The Horn relay will be measure without processing alarms. energized depending displays level, programming. The monitor can be refrigerant and the current time.
  • Page 33 The Pump Failure Possible trouble Once all of the measurement alarms alarm will be displayed if the monitor have been displayed, the Monitor will detects a flow failure. check for Trouble Alarms. Trouble Alarms will be generated if the Trouble Alarm monitor senses a fault in the Infrared Pump Failure Bench (sensor), a fault in the remote...
  • Page 34 * SenTech Monitor * blowing agents following refrigerants. ENTER PASSWORD Once appropriate Followed By ENT displayed, press the “ENT” key to Code : move the cursor from line two to line three.
  • Page 35 These settings are based on the current acceptable exposure levels Access Code # 1 and short-term exposure levels on a time weighted average refrigerants. SenTech recommends that under no circumstances should Access Code # a refrigerant monitor be set above Code short-term exposure level.
  • Page 36 Press the “ENT” key to move the Password Flag: The password flag cursor to the next entry. When all can be set to either 0 or 1. If a 1 is entries have been viewed, press the entered, the monitor will require the “ENT”...
  • Page 37 If there are any questions “ENT” key again to display the third regarding the correct implementation this feature, call SenTech system flag screen. technical support. LOW DELAY Press the “ENT” key to move the MAIN DELAY cursor to the next entry. When all...
  • Page 38 three relays are energized. If any Note that the RTC operates on a 24- relay has been energized, the fourth hour clock. For example to enter 2 line of the display will change to PM, enter the hour as 14, rather than instruct user to press...
  • Page 39 Minute (0-59) For Daily trend rate, the monitor will request: For Weekly trend rate, the monitor Hour (0-23) will request: Minute (0-59) Day of week (0-6) Hour (0-23) For Hourly trend rate, the monitor will Minute (0-59) request: Minute (0-59)

  • Page 40: Appendix B: Sentech Room Volume Considerations

    APPENDIX B: SenTech Room Volume Considerations (English) Normal industry practice has been to and reference locations have been thin about refrigerant leans in terms appropriately chosen, the monitor of pounds of refrigerant per unit time, will see a higher concentration than such as lbs/hr or oz/yr.
  • Page 41 Two examples have been developed to demonstrate the conversion. Case I is for a sealed room, with no air turnover. Case II is for a room with a known air turnover. Case I: Sealed room 40 ft x 30 ft x Given turnover 100cfm,...
  • Page 42 SenTech Room Volume Considerations (Metric) Normal industry practice has been to and reference locations have been thin about refrigerant leans in terms appropriately chosen, the monitor of pounds of refrigerant per unit time, will see a higher concentration than such as lbs/hr or oz/yr.
  • Page 43 Two examples have been developed to demonstrate the conversion. Case I is for a sealed room, with no air turnover. Case II is for a room with a known air turnover. 1. How much R-22 (in kg/yr) is Case I: Sealed room 15 m x 10 m x necessary to cause a measurement 3 m high of 25 ppm?

  • Page 44: Appendix C: Parts List And Wire List

    10. 422010, IR Bench, IR-SNIF-1,2,3 422015, Box, IR-SNIF-1,2,3 11. 422031, Control Board 422017, Backplate, IR-SNIF-1,2,3 12. 421036, Display (not shown) 422050, Tube End Filter, IR-SNIF-1,2,3 (not 13. 421031, Keypad, IR-SNIF-MCD and IR-SNIF- shown) 1,2,3 (not shown) 420053, Fitting, 1/8 Hose Barb to 1/8 NPT 14.
  • Page 45 Wire # From Type Description Valve, Sample Air-1 A1-P5-1 24 AWG ,Black Auto Sample GND Valve, Sample Air-2 A1-P5-2 24 AWG ,Black 24Vdc Valve, Fresh Air-1 A1-P5-3 24 AWG ,Black Auto Zero GND Valve, Fresh Air-2 A1-P5-4 24 AWG ,Black 24Vdc PS P2-1 A1-P9-3...

  • Page 46: Troubleshooting Guide

    All procedures in this can be performed with simple hand tools and a volt-ohm meter. If at any time, additional assistance be required, call SenTech Corporation at 888-248-1999 for technical support. 1. No Power a) Check the fuse and replace if failed.
  • Page 47 If there is no DC voltage, turn off the monitor and remove one device at a time from the DC power circuit. The 24 vdc relays can be removed from the relay socket. The control board can be disconnected at the input terminal on the board.
  • Page 48 “Installation” section of this manual. e) If the monitor does not respond to refrigerant, contact SenTech Corporation technical support. System Alarms a) Verify that the alarm is not a “Trouble Alarm” as when no Leak is Found described in Appendix A.

  • Page 49: Sentech Manufacturer's Limited Warranty

    If the equipment or any part or parts thereof prove to be defective in normal use, then such item or parts will be repaired or replaced at the option of SenTech by SenTech, provided that notice of such defect is given by original purchaser-user to SenTech within one (1) year from the date of original installation (Warranty Registration Must Be On File) or 15 months from the date of sale of the equipment to the original purchaser whichever comes first.
  • Page 50 05/20/2008...

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