4-20 mA

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4-20 mA

(4 to 20 MilliAmp) A point-to-point or multi-drop circuit mainly used in the process automation field to transmit signals from instruments and sensors in the field to a controller. It sends an analog signal from 4 to 20 mA that represents 0 to 100% of some process variable. As a current loop signal, 4-20 mA also powers the sensor transmitter on the same wire pair, and 4-20mA provides more resistance to interference than a voltage-based line. See HART.

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No references found			It is available as a standalone sensor for direct computer interface or as a system with remote 1/4 DIN display that includes output options of 4-20 mA, 0-20 mA, and RS232 and RS485. Non-contact temperature measuring sensors feature either fiber optic ... by Rubber World The controllers can be used with any sensor or device that produces 020 mA, 4-20 mA, 0-10V or 2-10V analog output. Setpoint controllers by Designfax Millivolt, voltage, frequency and 4-20 mA outputs are available on standard products. Pressure sensors, monitors and controls: product lines reviewed by Plastics Technology			3Dfx 3DIF 3DNow! 3DNow! Professional 3DO 3ds Max 3G 3G + Wi-Fi 3G Americas 3G iPhone 3G iPod 3G phone 3GL 3GPP 3GSP 3M Co. 3NF 3PH 3RU 3Station 3U 3XRTT 4 4,4'-sulfonyldianiline 4,6,3',4'-tetrahydroxyaurone 4-20 mA 4-amino-3-hydroxybutyric acid 4-aminoantipyrine 4-aminopyridine 4-AP 4-benzothienyl-N-methylcarbamate 4-chloro-3,5-xylenol 4-D chart 4-heptanone 4-hydroxy-3-nitrobenzenearsonic acid 4-methoxy-2-hydroxybenzophenone 4-methyl-5-thiazole ethanol 4-way 4.2BSD 4:3 4004 404 404 error 405LP 431A 43xx 45-degrees pipe lateral 4510 45Ca 473L Query 480 Hz			4 September 4 stroke 4 stroke cycle 4 stroke engine 4 t 4 4 t 4 4 times Common Intermediate Format 4 wheel drive 4 wheel drive 4 x 100 meter 4 x 100 meter 4 x 100 metres 4 x 100 metres 4 x 4 4 x 4 4 x 400 metres 4 x 400 metres 4',6-diamidino-2-phenylindole 4'-Dimethyamino-N-Methyl-4-Stilbazolium Tosylate 4'-ethoxybenzylidene-4-butylaniline 4'-Methyl-Alpha-Pyrrolidinohexanophenone 4+7 4,4'-Diaminodiphenyl Ether 4,4'-Methylenebis 4,4'-Phosphonicobis 4,4'-sulfonyldianiline 4,6,3',4'-tetrahydroxyaurone 4- 4-20 4-20 mA 4-30 4-alpha-d-glucanotransferase 4-Alpha-hydroxyphenylpyruvate hydroxylase deficiency 4-Amidinophenyl-Methanesulfonyl Fluoride 4-Amino-1,2,4-Triazole 4-Amino-3,5,6-trichloropicolinic acid 4-Amino-3,5,6-trichloropicolinic acid 4-amino-3-hydroxybutyric acid 4-Amino-4-Deoxychorismate Lyase 4-aminoantipyrine 4-Aminobenzoic acid 4-Aminobenzoic acid 4-Aminobenzoic acid 4-Aminobenzoic Acid Hydrazide 4-aminobutanoic acid 4-aminobutanoic acid 4-aminobutanoic acid 4-Aminobutyrate Aminotransferase 4-Aminohippuric Acid 4-aminophenol 4-aminophenol 4-Aminopyridine 4-Aminopyridine 4-Aminoquinoline-1-Oxide 4-aminoquinolone derivative 4-androstenedione 4-androstenedione 4-AP 4-AP 4-Azido-2-Nitrophenyluridylyl Pyrophosphate

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