{"id":195,"date":"2015-06-23T15:30:31","date_gmt":"2015-06-23T19:30:31","guid":{"rendered":"http:\/\/192.168.2.166\/~webapp\/support\/faq\/wordpress\/?p=195"},"modified":"2025-01-06T13:21:53","modified_gmt":"2025-01-06T18:21:53","slug":"avoid-spikes-sensor-readings-caused-emi-2","status":"publish","type":"post","link":"https:\/\/avtech.com\/articles\/195\/avoid-spikes-sensor-readings-caused-emi-2\/","title":{"rendered":"How To Avoid Spikes In Sensor Readings Caused By EMI"},"content":{"rendered":"<p>If you observe sensor spikes or exceptionally high\/low ranges of values, the culprit is usually electro-magnetic interference (EMI).<\/p>\n<p><strong>What generates EMI?<\/strong><\/p>\n<ul>\n<li>Florescent lights<\/li>\n<li>Large motorized machinery<\/li>\n<li>High powered cables<\/li>\n<li>Any other device that produces an Electro-Magnetic Field<\/li>\n<\/ul>\n<p>In general, increasing the distance of a sensor from the Room Alert Monitor also increases the chances of EMI causing sensor spikes. Typically, it&#8217;s the sensor cable that&#8217;s affected by EMI, rather than the probe itself.<\/p>\n<p>To ensure that EMI is the cause of the issue, AVTECH recommends a series of basic tests.<\/p>\n<div class=\"su-accordion su-u-trim\">\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-plus su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>Test for EMI issues<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<div class=\"su-row\">\n<div class=\"su-column su-column-size-1-2\"><div class=\"su-column-inner su-u-clearfix su-u-trim\">\n<h4>To test if EMI is causing the behavior you&#8217;re observing:<\/h4>\n<p>&#8211; Remove the sensor and cord from their current location.<br \/>\n&#8211; Disconnect any extension cords from the sensor.<br \/>\n&#8211; Connect the sensor directly to the Room Alert Monitor.<br \/>\n&#8211; Coil up the cord.<br \/>\n&#8211; Place the cord and probe right next to the Room Alert Monitor.<\/p>\n<p>With the sensor in this coiled-up state, EMI should be minimized, and spikes in temperature or humidity are typically pacified.<\/p>\n<p>If this is the case, then the cause of the spikes are, in fact, EMI.<\/p>\n<\/div><\/div>\n<div class=\"su-column su-column-size-1-2\"><div class=\"su-column-inner su-u-clearfix su-u-trim\">\n<p><a href=\"https:\/\/avtech.com\/articles\/wp-content\/uploads\/2015\/06\/EMI-RA12.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-12007\" src=\"https:\/\/avtech.com\/articles\/wp-content\/uploads\/2015\/06\/EMI-RA12.png\" alt=\"\" width=\"350\" height=\"227\" srcset=\"https:\/\/avtech.com\/articles\/wp-content\/uploads\/2015\/06\/EMI-RA12.png 3120w, https:\/\/avtech.com\/articles\/wp-content\/uploads\/2015\/06\/EMI-RA12-300x194.png 300w, https:\/\/avtech.com\/articles\/wp-content\/uploads\/2015\/06\/EMI-RA12-768x497.png 768w, https:\/\/avtech.com\/articles\/wp-content\/uploads\/2015\/06\/EMI-RA12-1024x663.png 1024w\" sizes=\"(max-width: 350px) 100vw, 350px\" \/><\/a><\/p>\n<\/div><\/div>\n<\/div>\n<\/div><\/div>\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-plus su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>Recommendations for environments with EMI<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>Unfortunately, not much can be done to prevent EMI; it can only be avoided in the monitoring environment. AVTECH suggests routing all sensor cables away from any major sources of EMI, or moving the Room Alert Monitor closer to the sensors.<\/p>\n<p>If the relocation and coiled-up sensor cable tests still yield spikes, our next recommendation is to relocate the Room Alert Monitor and sensors. Move them to an isolated location, such as an office, to provide a trial atmosphere that is free of EMI.<\/p>\n<p style=\"padding-left: 30px;\"><em>For information on discovering your unit after it has been relocated, please see <a href=\"https:\/\/avtech.com\/articles\/172\/how-to-discover-a-room-alert-monitor\/\" target=\"_blank\" rel=\"noopener\">How To Discover A Room Alert Monitor<\/a>.<\/em><\/p>\n<p>If the sensors still experience spikes after being physically relocated, attempt to isolate the issue to a specific piece of hardware. Move the sensors to different ports and check if the spikes follow. This will tell us if the issue is related to the environment, the Room Alert Monitor, or the sensor.<\/p>\n<\/div><\/div>\n<div class=\"su-spoiler su-spoiler-style-fancy su-spoiler-icon-plus su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>Delay notifications to avoid false alerts<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>There is a quick workaround that generally prevents false alerts caused by EMI. When EMI strikes, it usually occurs in short bursts\u2014often less than a second of duration. You may set a short delay in order to avoid receiving alert notifications for EMI spikes.<\/p>\n<div class=\"su-tabs su-tabs-style-default su-tabs-mobile-stack\" data-active=\"1\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-tabs-nav\"><span class=\"\" data-url=\"\" data-target=\"blank\" tabindex=\"0\" role=\"button\">Delay alerts at RoomAlert.com<\/span><span class=\"\" data-url=\"\" data-target=\"blank\" tabindex=\"0\" role=\"button\">Delay alerts in Room Alert Manager<\/span><\/div><div class=\"su-tabs-panes\"><div class=\"su-tabs-pane su-u-clearfix su-u-trim\" data-title=\"Delay alerts at RoomAlert.com\">\n<h4>To set the delay in RoomAlert.com:<\/h4>\n<p style=\"padding-left: 30px;\">Please follow the instructions in this Frequently Asked Question: <a href=\"https:\/\/avtech.com\/articles\/11435\/how-to-delay-actions-in-your-roomalert-com-account\" target=\"_blank\" rel=\"noopener\">How To Delay Actions In Your RoomAlert.com Account<\/a>.<\/p>\n<p style=\"padding-left: 30px;\">We recommend setting a delay of 5 minutes, the shortest option available at RoomAlert.com. You&#8217;ll need to delay each action associated with your alert.<\/p>\n<\/div>\n<div class=\"su-tabs-pane su-u-clearfix su-u-trim\" data-title=\"Delay alerts in Room Alert Manager\">\n<h4>To set the delay through Room Alert Manager:<\/h4>\n<ol>\n<li>Open Room Alert Manager. For instructions, please see our FAQ, <a href=\"https:\/\/avtech.com\/articles\/19834\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to Open Room Alert Manager\u2019s Web Interface<\/a>.<\/li>\n<li>In the navigation bar to the left, select <strong>Alerts<\/strong>.<\/li>\n<li>Locate the alert that you wish to delay. From that alert&#8217;s menu, select <strong>Edit<\/strong>.<\/li>\n<li>In the <strong>Then&#8230;<\/strong> section of the alert form, change the <strong>DO THIS<\/strong> selection from <em>immediately<\/em> to <em>after X seconds<\/em>.<\/li>\n<li>Enter a number of second that is higher than Room Alert Manager&#8217;s Data Polling Interval.<br \/>\nBy doing this, Room Alert Manager will wait to trigger the alarm until it reaches that number of seconds.<\/li>\n<li>Select <strong>Save Changes<\/strong> to save your action delay.<\/li>\n<\/ol>\n<p style=\"padding-left: 30px;\">For example, if the refresh rate for Room Alert Manager is 15 seconds, you can set the action to start <em>after<\/em> to 40 seconds. Room Alert Manager will be checking 3 times\u2014once at 0, 15, and 30 seconds\u2014for a sensor value that is above the alert threshold. In this time, any spikes will come and go, and Room Alert Manager will not trigger an alert because the quick spike did not sustain the elevated threshold for longer than 40 seconds.<\/p>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div>\n<div class=\"su-note\"  style=\"border-color:#e1da46;border-radius:5px;-moz-border-radius:5px;-webkit-border-radius:5px;\"><div class=\"su-note-inner su-u-clearfix su-u-trim\" style=\"background-color:#fbf460;border-color:#ffffff;color:#333333;border-radius:5px;-moz-border-radius:5px;-webkit-border-radius:5px;\"> AVTECH also offers <a href=\"https:\/\/avtech.com\/Products\/Sensors\/Digital_Shielded_Temperature_Humidity.htm\" target=\"_blank\" rel=\"noopener\">Digital Shielded Temperature &amp; Humidity Sensors<\/a> for use in environments with high electrical noise or EMI. Please contact your organization&#8217;s Product Specialist if you have any questions about purchasing a sensor.<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>If you observe sensor spikes or exceptionally high\/low ranges of values, the culprit is usually electro-magnetic interference (EMI). What generates EMI? Florescent lights Large motorized machinery High powered cables Any other device that produces an Electro-Magnetic Field In general, increasing the distance of a sensor from the Room Alert Monitor also increases the chances of [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[349,2],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/avtech.com\/articles\/195\/avoid-spikes-sensor-readings-caused-emi-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How To Avoid Spikes In Sensor Readings Caused By EMI - AVTECH\" \/>\n<meta property=\"og:description\" content=\"If you observe sensor spikes or exceptionally high\/low ranges of values, the culprit is usually electro-magnetic interference (EMI). 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