{"id":205,"date":"2010-08-16T10:31:35","date_gmt":"2010-08-16T16:31:35","guid":{"rendered":"https:\/\/scadametrics.com\/blog\/?p=205"},"modified":"2022-10-15T16:14:07","modified_gmt":"2022-10-15T22:14:07","slug":"modbus-based-flow-metering-and-pressure-monitoring","status":"publish","type":"post","link":"https:\/\/scadametrics.com\/blog\/?p=205","title":{"rendered":"MODBUS-Based Pressure Monitoring and Flow Metering"},"content":{"rendered":"

\"James

Jim ‘Slim’ Mimlitz, SCADAmetrics<\/p><\/div>The Preciseline<\/a> Pressure Transducer (manufactured by Keller-America<\/a> ), like our EtherMeter<\/a>, offers a digital Modbus-based solution to a water telemetry problem that was previously solved by analog (4-20mA) instrumentation.<\/p>\n

\"\"<\/a><\/p>\n

In the case of the Preciseline, the\u00a0water pressure<\/strong><\/em> signal is converted into Modbus; whereas in the case of\u00a0our EtherMeter, error-free totalization<\/strong><\/em> and flow-rate<\/strong><\/em> data is collected from a compatible flow meter(s) and converted into Modbus .<\/p>\n

As I\/O counts grow and instrumentation complexity increases in water plants and pump stations, the addition of smart Modbus sensors is a natural solution\u00a0that can simplify control system integration challenges.<\/p>\n

For example, using a multi-drop Modbus\/RTU network, a single shielded cable (+24VDC\/Gnd, RS485A\/RS485B)\u00a0can be routed throughout a water plant or pump station to communicate with (and provide power to)\u00a0an assortment of Modbus-based\u00a0devices.<\/p>\n

As an example, Jersey County Rural Water Company (Jerseyville, IL) recently completed construction of a new pumping station\u00a0at Godfrey, IL.\u00a0 The control system at the station features a Modbus\/RTU multi-drop network that communicates to\u00a03 Preciseline transducers which monitor station effluent pressure, influent pressure, and the level of water in the ground storage tank.<\/p>\n

The same network also includes 2 EtherMeters, which report totalization and flow-rate\u00a0from\u00a04 flow meters (2 Sensus<\/a> Omni-T2 meters and 2 Neptune<\/a> HP Turbine meters), along with a SolarBee (Medora Corp) active mixer.<\/p>\n

\"\"<\/a>

3 Preciseline pressure transducers and 1 EtherMeter connected to the pump station’s multi-drop Modbus\/RTU (RS485) network. The transducers are monitoring effluent pressure, influent pressure, and ground storage tank level. (Click to zoom.)<\/p><\/div>\n

Had this project been addressed using legacy analog methods, then the aforementioned signals would have required\u00a09 shielded cables connected to an RTU via\u00a04 analog-digital converters, 4 pulse-counting channels, and 1 digital input channel.<\/p>\n

Therefore, the use of Modbus may significantly reduce the costs associated with wiring, conduit, and instrumentation.\u00a0 Furthermore, the future addition of other Modbus-based devices is highly simplified.<\/p>\n

\"\"<\/a>

An EtherMeter-connected, 6\u2033 Sensus Omni-T2 meter. One of four meters in the pump station. (Click to zoom.)<\/p><\/div>\n

In this application, Jersey County\u2019s potential upgrade plans include\u00a0tying the 3 variable-speed drives, 3 motorized valves,\u00a0backup generator, power meter, and Chlorine Monitor\u00a0into the Modbus network.<\/p>\n

\"\"<\/a>

Modbus\/RTU network schematic. (Click to zoom.)<\/p><\/div>\n

On 03 Sep 2010, Jersey County Rural Water Co. is hosting a Dedication Ceremony and Open House for the Pump Station featured in this article. The described Modbus flow metering and pressure monitoring technology will be displayed at this event. If interested in attending, please contact Jim Mimlitz at SCADAmetrics 636.405.7101.<\/p>\n

For further information on the Preciseline and other Modbus-capable pressure transducers, please contact Chris Lilly at Keller-America<\/a> 757.596.6680.<\/p>\n","protected":false},"excerpt":{"rendered":"

The Preciseline Pressure Transducer (manufactured by Keller-America ), like our EtherMeter, offers a digital Modbus-based solution to a water telemetry problem that was previously solved by analog (4-20mA) instrumentation. In the case of the Preciseline, the\u00a0water pressure signal is converted into Modbus; whereas in the case of\u00a0our EtherMeter, error-free totalization and flow-rate data is collected …<\/span> Read More →<\/span><\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":213,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4,5],"tags":[42,43,13,41,62,61,28,30],"class_list":["post-205","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-applications","category-meteringtechnology","category-modbusprotocol","tag-df1","tag-ethernetip","tag-flow-rate","tag-modbus","tag-modbus-pressure-transducer","tag-pressure-transducer","tag-totalization","tag-water-meter"],"_links":{"self":[{"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/205","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=205"}],"version-history":[{"count":67,"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/205\/revisions"}],"predecessor-version":[{"id":2447,"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/205\/revisions\/2447"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=\/wp\/v2\/media\/213"}],"wp:attachment":[{"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=205"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=205"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/scadametrics.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=205"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}