Application Notes
Isolation

Isolation / Temperature / Pulse / Strain Gauge / Potentiometer / AC
Pneumatic / Function / Power Supply / Alarm / Power Mesurement
Trend & Log/Communication / Surge Protection / Other Topics

030001 What's the isolator unit used for?
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030002 Our system consists of various manufacturers' instruments, and sometime we meet errors of unknown origin. Each manufacturer of the system says their part of system has no problem. Any idea ?
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030003 Can you tell us how to minimize a destruction of instruments at control room site caused by a field instrument trouble?
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030004 It is said that the grounding at two locations would cause errors. Why? How can I handle the problem?
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030005 At start up of our control system, we can detect signal influences between different instruments. Is there a simple solution for this?
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030006 The output signal response decreases after installing an isolator unit into a loop for data-logging of vibration analysis. Any solution ?
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030007 We have a requirement for a contact signal from the field to be input into a computer. Can M-System's Model M2SV handle this?
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030008 Can we use a loop power supply unit as an isolator unit having 4 - 20mA DC as the input signal?
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031001 I want to convert the difference (absolute value) of 2 signals A and B to 4-20mA DC. Please explain the method and a transmitter to be used.
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031002 I want to transmit instantaneour value (4-20mA DC) of CT current (0-5A AC) on a power panel in the field to a monitoring room as well as get a high alarm contact signal. However there is not instrument power on site and transmitters cannot be installed there.
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031003 Standard M2VS output is up to 12V, but I need 0-15 Vdc.
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031004 I plan to indicate a flow signal 4-20mADC (corresponding to 0-2000 l/h) used in a plant on two indicators with different scaling. The existing indicators are A. 4-20mA DC input with the scale 0-1500 l/h and B. 0-5V dc input with the scale 0-100 l/h. I want to used them. the actual flow does not exceed 1000 l/h. can i deal with this with a single transmitter and adjusting the scaling?
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031005 When tank level of irregular shape is being measured with the use of a level transmitter, it takes a lot of troubles to measure the volume of tank.
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031006 Air flow from a blower is being controlled remotely with a flow setter (angle setter of a damper), which is very difficult to set the air flow.
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031007 Interface problems with the proliferation of systems in plants
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031008 PLC product lines with NON-isolated analog inputs
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031009 An engineering company had specified an analyzer and a DCS system. During startup they discovered that both devices were trying to power the loop. Additionally the DCS was providing a common power supply for multiple loops.
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031010 What is the difference between 2-wire and Loop-powered?
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031011 We want to get 4-20mA DC from a control circuit to provide the signal to a speed controller. However, one problem is that there is a difference in electric potential (50 to 100V) between each of the ground, the control circuit and the speed controller. what can we do in this case?
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031012 The "master" drive must control four separate "slave" drives from a single 4-20mA DC signal.
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031013 How to beat loop impedance constraints
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031014 Current-to-voltage transducers give strange output readings.
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031015 Which type of isolators to choose from?
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032057 "super" SV unit
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032068 To monitor a solar power system, we measure an output voltage of its system and want to receive an alarm outputs if the measuring value fell than a set value. We had used a DC Alarm, model AS4V previously, but this time, the measuring voltage range is to be 0-1,000Vdc which is not able to input directly to the AS4V. Additionally, our existing panel room is not so large.
Do you have any good idea to solve our problem?
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032082 We have replaced an old, out-of-order pressure transmitter which outputs 10-50 mAdc. The new one, on the other hand, outputs 4-20 mAdc, so we have also purchased a 4-20 mA current loop supply model M2DY-A-M to power the transmitter.
The only instrument we do not want to replace is the expensive receiving instrument in the control room which is suitable only for 10-50 mA signals, and is still in good working order.
We have to find a way to convert 4-20 mA into 10-50 mA signals to maintain the compatibility between the field and the control room.
Does M-System have a suitable transmitter for this application?
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032083 We are preparing UPS in our power monitoring system for system backup purpose in case of blackout. On a power monitoring panel, we also want to monitor UPS’s charging condition by using digital indicator. Does M-System have any transmitter for this application? For your reference, our UPS’s battery capacity is 12 Vdc at full charging.
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032106 We plan to measure a heavy oil amount of consumption of an oil tank.
A level meter installed in the tank is providing 4-20 mAdc in proportion to 0-100% of oil level. We like to see the oil consumption as positive value on the panel meter; therefore inverted output of 20-4 mAdc is required for the transmitter to provide.
Moreover, we like to add limit function on the transmitter’s 0% and 100% output. Does M-System have suitable transmitter for this kind application?
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Isolation / Temperature / Pulse / Strain Gauge / Potentiometer / AC
Pneumatic / Function / Power Supply / Alarm / Power Mesurement
Trend & Log/Communication / Surge Protection / Other Topics
 
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