Zach Andrews Eric Barr Brandon White November 2, 2009 Luke
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1. excelled in each category but added a sense of simplicity to each action that no other unit came close to matching Below is a decision matrix we constructed to aid in our evaluation g gj 5 e 4 Z E N d e ga a e e 50 g N oO S S g Q A o D EN N Total e wn e N Cost 4 4 5 4 Email Alarms 5 5 5 0 Phone Alarms 3 5 4 0 Visual Audible Alarms 0 5 0 0 Power Presence Alarm 0 5 0 0 Remote Web Access 4 5 0 0 Computer Interface 4 5 3 3 Battery Backup 5 5 5 5 Expandability 4 5 2 2 Warranty 4 5 2 3 Delivery 1 5 5 2 User Friendly 3 5 3 3 Chart 5 Component option decision matrix Scoring 1 5 5 Best 1 Worst The first basic requirement is the ability to accurately monitor log the temperature and relative humidity conditions within multiple areas This unit easily passes this test with external 2 in 1 probes that monitor both The temperature range of these probes which extends from 40 F to 185 F goes well beyond our requirements These probes also have an accuracy of 0 9 F within the temperatures they will be utilized at and an accuracy of 2 7 F at more extreme hot cold temperatures which are beyond adequate Relative humidity can be tracked between 10 90 with an accuracy of 2 All logging intervals are also completely Page 14 configurable These probes are also manufactured by Sensatronics and made specifically for this unit so integration is mad2. If time allows the group also would like to consider mechanical electrical backup system that would increase the amount of time between the alert and the onset of damaging internal environmental conditions This system would simply shut off the evaporators during the event of compressor failure turning the refrigeration units into effective insulated ice boxes This would allow more time for the client to respond to the alert and assess the malfunction before content damage occurred If time does not allow for the implementation of such backup system because it could be installed without affecting the implied monitoring system this could be set up as a secondary project to be designed and installed at a later date Client Our client is Dr Daniel E Guyer Professor of Biosystems and Agricultural Engineering at Michigan State University His Extension and Research includes postharvest handling value added processes for fruit vegetables and chestnuts as well as spectral analysis machine vision and pattern recognition for agricultural sensing applications Dr Guyer s profile is found at http www egr msu edu age guyer html Assisting Dr Guyer on this project is Steve Marquie research assistant for Biosystems and Agricultural Engineering Mr Marquie has expertise in instrumental equipment technology and will be guiding and helping with any tech problems Steve Marquie s profile is found at http www egr msu edu age marquie htm
3. e UPS battery backup Along with our internet research we utilized the knowledge of the MSU staff to aid in our design Steve gave us valuable information and feedback and we spoke with Phil Hill about the actual installation process He gave his opinion on logger and probe mounting techniques and also let us know what materials in the annex we could use for the construction We were also granted access to necessary tools in the shop that he oversees When we get ready to run wire and conduit we may also consult Truman Surbrook or Jon Althouse for electrical codebook parameters Options Option 1 Sensatronic s Environmental Sensing http www microdaq com sensatronics senturion rackmount environmental monitor php One option for hardware is the Sensatronic Senturion Rack Mount Environmental Monitor as shown in Figure 1 This unit is virtually an all in one unit to complete the tasks that we require The unit can monitor log the desired conditions of all 3 refrigeration units allow users to access this info from anywhere using the Internet via its static IP address and send alerts by emails phone numbers during alarm situations The main argument for this unit is that it is extremely customizable and extremely user friendly All features are self contained within this unit eliminating the need to piece together a working system from many different products It is additionally capable of running many different sensors and probes at the same time
4. monitor unit door activity 2 228 89 Page 17 Chart 6 Installation Supply List Necessary tools Drill Hole saw drill bit Hex head drill bit for screws Silicone gun Saw for cutting PVC PVC glue and cleaner http www lowes com Design Item Quantity Price Total 34 PVC conduit 42 0 94 10 3 95 34 PVC T connector 2 2 97 5 94 34 PVC LB connector 3 2 98 8 94 Silicone tube 1 5 97 5 97 1 1 2 wood screws logger mounting 1 box of 25 4 97 4 97 1 self tapping metal screw 1 box of 50 4 92 4 92 Although we have not received any parts equipment to begin installation yet it was imperative that we research the entire process from start to finish To determine the best option We began from the core of the system and determined the best place to mount the actual unit and how We determined a suitable spot directly next to the refrigeration units located on the wall of the annex near where the units are located in This area is located safely away from the dangers of foot equipment traffic through the annex It is also very close to a suitable area to connect the power supply To mount the unit we will first mount a plywood base to the annex wall and then mount the unit and UPS to this base There is also a suitable Ethernet connection already established in the immediate area to connect to Page 18 We then considered the next part of the system whic
5. software in order to take in data From there the information can be exported to an Excel file Page 12 Logger Sensor ACR Smartreader 2 tiw tator Air Temp Accuracy 2 C Air Temp Resolution 1 C Air Temp Measurement range 40 to 70 C RH Accuracy 4 RH RH Resolution 0 4 RH RH Measurement Range 0 to 95 RH 20809000350 Figure 6 ACR Smartreader 2 Software Trendreader 2 e USB interface e Capable of exporting to Excel Item Price Quantity Total ACR Smartreader 2 logger 860 00 1 860 00 Remote Temp RH probes 239 00 2 478 00 Trendreader 2 software 240 00 1 240 00 PC Available through client 0 1 0 Chart 4 Itemizes the components and cost for this option Upon considering the other options and what was required of the system we were forced to eliminate ACR due to the fact that it cannot send alerts of any kind It only records data and displays it Alerts are the key inclusion into our system design and the lack of its availability in this software renders it useless to us Evaluation After carefully considering all of our possible hardware software options we have decided that the best choice is clearly the Sensatronics Senturion Temperature Monitor This is a small unit measuring 19 00in x 3 94in x 1 77in which can easily be wall mounted for this application When rating each unit in its ability to satisfy the needs required this model not only Page 13
6. such as temperature and relative humidity probes sensors that record whether the doors are open or Page 8 closed and power presence probes Suggested features include a power presence probe as well as an Uninterrupted Power Supply UPS that will continue to power the unit for a limited time during a power loss allowing for alerts to be sent to the client Sensors Sensatronic s Temperature and Relative Humidity Probe e Air Temp Accuracy 5 C e Air Temp Measurement range 40 to 85 e RH Accuracy 2 RH e RH Measurement Range 10 to 90 Figure 1 Sensatronic s Temp amp RH Probe Data Logger Sensatronic s Senturion Rack Mount Environmental Monitor e User friendly e Rugged e Multiple inputs e Remote Alarms e LCD Readout e Web Based operation Figure 2 Sensatronic s Senturion Rack Mount Environmental Monitor Item Price Quantity Total Sensatronic Senturion Rack Mount Environmental Monitor 949 00 1 949 00 External Temp RH Probe w 50ft cable 185 90 3 557 70 Power Presence Probe w 50ft cable 139 70 1 139 70 UPS Battery Backup Available through Client 0 1 58 99 Automated Phone Dialer 218 90 1 218 90 Magnetic Door Sensor w SOft cable 68 20 0 0 00 Chart 1 Itemizes the components and cost for this option Page 9 Option 2 Using Campbell Scientific components http www campbellsci com pThe second option would utilize three HMP45C Tempera
7. the top is easily accessible for running wires and conduit into the coolers The Ethernet cable that supplies the internet source will allow for remote accessibility of the monitoring system Expectations The most important expectation placed upon our group is that the whole system be fully operable as soon as possible but also be reliable and easy to use We are required to research the most cost effective and easy to operate solution that we can find in a timely manner It is desired that we have the aforementioned user manual completed soon after installation Further we are expected to handle both the design and installation aspects of the project Objectives e Design system that monitors temperature and relative humidity inside all three Master Bilt V39LX094XX refrigeration units O O O System should allow for real time monitor display and alert when system fails System design requirements Temperature accuracy Minimum 0 5 F Temperature resolution Minimum 1 F Humidity accuracy Minimum 0 5 Humidity resolution Minimum 1 System must be able to log measurement data Must be able to record data in time intervals as small as 1 minute apart Research best priced and most highly functional alternatives for monitoring units Formulate block diagram to compare all alternatives prior to selection Page 4 e Research refrigeration units requirements i e drilling procedures warranty inf
8. Zach Andrews Eric Barr Brandon White November 2 2009 Luke Reese Biosystems and Agricultural Engineering MSU Dear Dr Reese Attached is our rough draft for Dr Dan Guyer s project This project includes researching designing and implementing a working remote refrigeration monitoring unit for protecting valuable research items stored within refrigeration units Housed in the annex behind Farrall Hall three Master Bilt walk in refrigeration units will be monitored Thank you for this opportunity We look forward to completing this project on December 16 2009 Sincerely Zach Andrews Eric Barr Brandon White Enclosure Problem Statement Three Master Bilt V39LX094XX commercial walk in refrigeration units exist in the annex behind Farrall Hall on MSU s campus They are used to store research material for MSU faculty graduate and undergraduate studies within the College of Agriculture and Natural Resources Currently there is no way to remotely monitor if any malfunction occurs on any of the units whether it is compressor failure power outage or even if the internal environmental conditions are unsuitable This may result in valuable research material being lost A monitoring system needs to be implemented to alert the client of a malfunction and constantly record internal environmental data Project Client Description The Refrigeration Monitoring System RMS is needed to monitor primarily for compressor fail
9. e an add on AC power supply conversion Even if any of the other units seemed better suited in the power supply category the Sensatronic s aforementioned ability to operate without an external PC allows it to prevail in the external necessities category Last pricing was taken into consideration The Sensatronics unit was not the most inexpensive of our possible options however it easily fit into our 3000 budget The unit was not the most expensive option and was not very far off from its less expensive competitors After rating all units in all of the previously mentioned areas it is pretty clear that the Sensatronics has an extremely high value per dollar In this sense the Sensatronics once again scores better than any of its competitors Budget The project was given a 3000 budget at the first meeting The client informed us that this money was not directly supplied by the university Our goal is to complete this project while remaining under budget After completing our evaluation and deciding on the Option 1 using the Sensatronics equipment we constructed a customized order form Appendix C to use for purchasing the equipment The order form contains three different pricing packages Package one contained just the essential equipment we needed to get the system up and running 2 024 29 Package two contained extra power presence probes to monitor the compressors individually 2 443 39 Package three contains extra sensors to
10. e as simple as possible These probes connect to the unit via RJ12 connections and have a plug and play setup This unit also manages to log data via easy to use software already included installed into the unit itself The unit allows the user to label each probe and easily view conditions via a built in LCD display located on its front panel Users use this screen along with the buttons located on the unit to configure every aspect of its settings such as acceptable ranges labels alerts administrators data graphing etc This unit has a built in web interface so you have a complete stand alone unit that doesn t require an external PC to operate All the other options require a PC to function The monitor requires an Ethernet connection and can utilize either a standard or dynamic IP address This monitor retains up to 122 days of data To store info beyond that range it can upload data to a designated server folder in the form of a csv file which can easily be displayed in Microsoft Excel This web interface will allow the user to remotely access all conditions data via the internet from anywhere According to Sensatronics any firmware updates that are released are completely free and update across the web automatically The next major requirement that is a necessity of our chosen system is its alerting abilities Once again this unit easily ousted its competitors with its many strengths This unit has the ability to set individual high and lo
11. e probes are suited for mounting into the ceiling of the unit it would require a slightly larger hole to be drilled into the ceiling so that the probe may protrude out of it Another option would be to use a custom wall mount bracket with self tapping screws to mount the unit to the wall securely Research and Research Methods Refrigeration Units The units used are a custom commercial walk in refrigerator freezer set up by Master Bilt Refrigeration Solutions Model V39LX094XX The custom three unit design is housed in a single structure with external dimensions measuring 277 L x 93 W x 98 25 H For more detailed dimensions diagrams and pictures refer to Appendix A and B For our research we used Google as our primary search engine Due to the fact that we were researching products to buy we didn t necessarily need advanced search engines or journal databases The search engine was used to find different RMS design options and prices and also to find details on the refrigeration units that we are working with To research the cost of construction materials we used www lowes com to establish a baseline estimate price We also used our client Steve Marquie s suggestions for keywords in our search Some of the keywords that we used were e Data loggers e Temperature and RH probes e Logging software e Campbell Scientific e Omega e National Instruments Page 7 e Record temp and RH e Master Bilt refrigeration e Data Acquisition
12. esign Installation to come Page 19 Appendix A Top View Side View 865 88 86 5 Front View 277 Page 20 Appendix B More pictures to come Page 21 Appendix C Produot Price osoh item No Losation Senssronc Serturion 3sck Mourt Environmertsi Monitor 939 00 703 1000 Milon sergaroricn com Senzstronic External Temp RH Probe w SOft cable 85 90 600 1113 50 MLUzore sergmronics com Senzstronic Magnesc Door Sensor wi SOft cadie 68 20 600 1043 50 tt store serssronics com Sensatron Power Presence Probe wi SOR cabe 39 70 600 1101 50 MLUZiore sergaronics com Beirut Pusborssbex Pharm Distr 3218 50 eon 1 1 5 pe ERS I Te ot Sree N APC Back UPS 158 89 ES BESSOG ht Paokage 1 The esseriais fuenewmninin Serturinn dare Aniant Eeosiemnesentwi Monier External Temp RH Probe w SOR csbie 557 70 Magnetic Door Sensor w SOft cabie 0 00 Power Presence Probe w SOT cate 35 70 Sensaront Senturion 33ck Mount Environrertsi Monitor 1 External Temp RH Probe w SOR csbie 3 557 70 Magnetic Door Sensor w SOft cable i 0 00 Power Greener Pre wi Lm cate 4 SRA an APC Back UPS 1 58 99 Senzstronic Automates Phone Diser 1 218 30 Misc Supplies 00 00 Grand Total Paokage 1 Sensors tc monito
13. f course means that a computer must be located near the refrigeration units in order to accept the information from the logger sensor This was an issue for us because while there is a computer available it is an older model and there could be issues with computer failure The software is the only part of this system that sends any kind of alarm so if the software is not able to run the whole system would be useless Another issue was the price of the equipment While saving money and staying under the budget is a significant positive we felt that there was a point that things can become cheap and we didn t necessarily want that We reasoned that spending a little more money would save breakdowns and headaches based upon the theory that one gets exactly what one pays for Option 4 ACR Systems Inc http www acrsystems com The Fourth option that we discussed was provided by ACR Systems Inc The desired equipment included a data acquisition logger two temperature and RH probes and the compatible software The logger contains four channels with two allocated to temperature and RH directly measured from the logger s location The other two channels can be used for temperature and RH probes that can be routed from the first refrigeration unit to the others This requires that all equipment be contained inside of the units with the USB interface cable running from the logger to the computer The computer must be equipped with the Trendreader
14. f the data loggers which cuts out one more part of the system under this option The logger sensor is then linked to a computer which must have the mandatory software to display the recorded values The linkage to the computer is established through the COM port on the back of the CPU The logger sensor unit can be purchased for 199 00 while the software is sold for 99 00 This gives a total cost of 696 00 plus shipping for the required equipment from OE Inc Logger Sensor Omega OM CP RHTEMP101 Humidity and Temperature Recorder LE OMEGA e OM CP RH Templo Air Temp Accuracy 5 C Air Temp Resolution 1 C A Air Temp Measurement range 40 to 80 C Rocco RH Accuracy at 25 C 2 RH 3 RH Resolusion 0 5 RH 9 RH Measurement Range 0 to 10096 RH Figure 5 OM CP RHTEMP101 Software e Sends alarms through e mails or numerically coded phone call e Syncs data from several logging inputs together e Icon in software allows easy exportation to Microsoft Excel spreadsheet Item Price Quantity Total OM CP RHTEMPI101 199 00 3 597 00 OM CP IFC110 99 00 1 99 00 PC Available through client 0 1 0 Chart 3 Itemizes the components and cost for this optio Page 11 Although these options are very cost effective and seem relatively user friendly we did not choose to implement any of this equipment into our system One of the major concerns was with the use of a software program to record the data This o
15. h is the wiring connecting the main unit to everything else We realized that all wiring would need protection from many hazards such as other equipment and wildlife We specified suitable forms of conduit for this application and have been informed that our clients may already have it We measured every length dimension of the refrigeration units inside and outside and created a replica of the units using AutoCAD software This allowed us to easily determine needed measurements such as required wire length and the best paths of installation We determined the proper tools and drilling procedure to create the paths needed for wiring conduit from the exterior of the refrigeration units to its interior A form of silicone caulk will be used to seal off around the conduit once it is run through the wall The last systems installations are the probes that will be mounted inside the refrigeration units This should be a simple procedure We ve decided on constructing shields that will double as the mounts for the sensors out of pvc We will take temperature readings in many different areas of each of the three refrigeration units This allowed us to determine how much the temperature varied in different areas and choose a mounting location that would yield the average temperature across the unit We also made sure to choose an area that is located out of harm s way from research and equipment that is moved in or out of the units More Details on d
16. l Page 2 Situational Analysis Audience For the target audience we have some stipulations that must be considered In general the personnel using the system may not have an extensive background in the equipment setup It is very important that the system be very user friendly to aid in its upkeep and utilization The following demographics are to be considered about our user audience e Typical occupations MSU professors and students e Typical age 20 e Gender mix about equal e Education level college e Audience s knowledge level of the subject low e Audience s interest level high e Estimated audience size 25 50 people The most significant bullet point in the above list to us is the low knowledge level To combat this problem our plan is to assemble a user s manual that will allow the audience to easily analyze and understand the system The manual will include information from the individual component manuals a complete system description and troubleshooting methods Environment This monitoring unit will be housed in the annex behind Farrall Hall on Michigan State University s campus This facility is equipped with heat 120 volts AC power Internet via Ethernet cable and telephone connection All system components will be contained and operating within the annex The refrigeration units are located against the west wall of the Page 3 building This positioning renders the back of the units unavailable however
17. n which is simply not an option Otherwise items research that depends on these refrigeration units are in constant jeopardy of a unit failure that may not be discovered until valuable research material has been damaged Our aim is to not only alert the proper individuals immediately if such a failure should occur but to record unit conditions over time and allow web phone access to these records Assumptions Our main assumptions are focused on the installation of our proposed system During the installation we will need to mount our probes inside of all three refrigeration units and connect them to the CPU of the system mounted outside of the refrigeration units The first assumption deals with the wiring between the two All sensors are connected by CATS wiring so we should be able to bypass drilling into the refrigeration units by following the same path with our wires as the standard wiring already running into the unit This would save us precious time and unnecessary actions in our installation If for some reason we encounter a problem that prevents us from using this method the new conduit will have to be run and a new hole will have to be drilled for that conduit Page 6 Another installation assumption deals with their mounting procedure It is assumed that a very strong adhesive may qualify to mount the probes into the refrigeration unit which also would help to minimize drilling and possible errors If for any reason at all th
18. ogram the unit to allow 5 minutes for a local user to respond to these conditions before it decides to alert an administrator that is away The great thing about the administrator set up is that alerts to these users can be set independently This means that it can be set to alert only 1 person such as the person overseeing the particular research in the refrigeration units at the time initially during unacceptable conditions and then alert another person at a later time if the 1st person does not respond Eight total responses can be programmed and they can be configured any way the user desires This unit only needs one addition of external hardware which is a UPS to supply the 120VAC that it requires The unit will shut down when power is lost so this will allow the unit to continue to operate for a moderate period of time after any power outages to the UPS We will couple this with an available power sensing probe that will monitor power between the wall outlet and the UPS and connect directly to the Sensatronics monitor This will allow the unit to know when power has been lost and alert the administrators while it is still operational made possible though the addition of the automated phone dialer assuming that the phone lines are not Page 16 down as well This category still has the Sensatronics unit ranked at 1 Some other units are powered by batteries but this would add additional effort to maintain the batteries Other units requir
19. ormation design specs dimensions o CAD draw up of units e Research all costs o Sensors and logging equipment o Wiring and conduit o Create order form e Install proposed system according to design e Assemble user manual to aid in troubleshooting and understanding of system e Meet all assignment deadlines within the project e Complete final report by December 16 2009 e If time allows research design and install backup that shuts down unit completely o Prevents overheating and allows time for client to identify problem Schedule e Every Thursday 9 00am 10 00am Meeting With Dan Guyer and Steve Marquie e Every Wednesday 6 00pm 10 00pm Group Meeting e September 24 Initial project meeting with Dan Guyer and Steve Marquie e October 8 Complete Project Management Contract e October 15 Project rough draft outline completed e November 3 Secondary project rough draft completed e December 10 Project poster completed e December 11 Oral Presentation Project 90 95 completed Page 5 e December 16 Project 100 Complete Final written project report completed e MS Project Gantt Chart Scope The scope of this project is to provide an answer for a large weakness in the security of this particular refrigeration system Our client has stated to us his constant concern for the condition of the units after he leaves the area for the day Without our system in place these units would require constant human supervisio
20. r dow activity Quantity Price 1 Year 2 Year 3 Year Senzsront Serturion 3ack Mount Environmental Monitor 1 345 00 Exended Extended Extended External Temp RH Probe wi SOR csbie 3 557 70 Moyrcth Duu Sous WIOL cabic 3 3204 99 Power Presence Probe w 50 cabe 1 35 70 APC Back UPS 1 158 98 Senzstronic Automatec Phone Diser 1 218 90 Mx Supcies 00 00 Grand Total Labor instaling Setup and Trouble Shooting 20Hrs Max Contact Sencatrorios www zenzatronicz com Sales Prose 800 632 1033 irecrmesore honc CO3 Z24 0107 Fox 603 2242401 Physical Address 20A Ounbiee Road Bow NH 03301 SPE umana ane com Technical Support Technical Support 800 555 2725 Sales Support Sales Support 877 272 2722 Service Sates Support Service Selector 800 555 7527 Battery Saez Custome Service Request 600 300 7141 Customer Service Custome Service Request 877 272 Address 132 Fairgrounds Road W K ngsbn R3 02852 UNITED STATES Page 22
21. ture and Relative Humidity probes from Campbell Scientific one inside each of the refrigeration units to take readings The probes will require a to the data logger preferably CR1000 The data logger would then be connected to a computer running RTMCPRO Real Time Monitor amp Control Software While being connected to the Internet these components will allow us to remotely monitor and alert on temperature and humidity readings Sensor Campbell Scientific HMP45C Temp and RH Probe e Rugged e Air Temp Accuracy 5 C e Air Temp Measurement range 39 2 to 60 C e RH Accuracy at 20 C 1 RH e RH Measurement Range 0 8 to 100 Data Logger Campbell Scientific CR1000 e Rugged e Multiple inputs e Remote alarms e Available through client RTMCPRO software e Remote monitoring via internet server e Email alerts Figure 4 CR1000 Item Price Quantity Total HMP45C Temp and RH Probes 600 3 1800 CR1000 Data Logger Available through Client 0 1 0 RTMCPRO Software 435 1 435 PC Available through client 0 1 0 Chart 2 Itemizes the components and cost for this option Page 10 Option 3 Omega Engineering Inc http www omega com When evaluating the potential options available through Omega Engineering Inc it appears quite evident that they offer the most cost friendly alternative of the considered manufacturers The temperature and relative humidity sensors come packaged inside o
22. ure as well as power outages and irregular temperature fluctuations The consequence of compressor failure is a rapid temperature rise inside the cooler and ultimately the spoilage of all contents Materials in the cooler are designated for research and spoilage can cost the University a significant loss of data and ruin research projects Upon compressor failure the evaporator fans blow only warm air created by the fan motors thus warming up the cooler even faster During the case of a power outage all components of the refrigeration unit cease to operate rendering them as icebox units slowly raising the internal temperature If the internal temperature of the refrigeration units could be monitored remotely at regular intervals damaging temperatures might be averted by alerting someone of the system failure Our proposed monitoring system design would implement a linkage between sensors data loggers and the client s computer or cellular phone Through this system the client will be Page 1 able to monitor temperature and relative humidity remotely this will allow them to receive alerts if a refrigeration unit malfunctions a power failure occurs if humidity levels become unsuitable for research materials or if any other event leads to a significant change in temperature Upon alert notification the client can acknowledge and repair the malfunction before the internal conditions of the unit become unsuitable and its contents are damaged
23. w threshold limits for each probe in use Other systems were also able to do this but the Sensatronics system surpassed these units in its numerous response options The unit has a wide range of actions that can be configured to respond to unacceptable conditions This list includes flashing its LCD screen bright red audible alerts and e mail or text alerts to multiple administrators This convenience is then multiplied by its ability to set up multiple reactions during different unacceptable condition scan counts This allows the Page 15 unit to execute different actions over the course of continuing alarming conditions This could allow the system to begin with a relatively light course of alarm action and then gradually escalate its actions until the alarm is acknowledged For example let s say the unit is set to scan conditions every minute The unit can be configured to flash its lights and or make an audible alarm during the first scan beyond its preset limits This will allow anyone in the immediate area that may be currently using the refrigeration units and causing the conditions to respond to the alarm directly on the unit itself as soon as they are detected This would prevent the unit from sending out unnecessary alerts to users when the problem can easily be taken care of by a local user The unit could also be set to send a text email to a particular administrator after six consecutive scans at unacceptable conditions This will pr
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