Is it possible to convert 4 wire transmitter to convert to
2 wire with additional relay.Please send detial with
drawing,i will appreciate.
- 2 Answers
- 6604 Views
- I also Faced
- E-Mail Answers
Answer Posted / carl_ellis
No, it is not possible to convert a 4 wire device (power on
2 wires, output signal on 2 wires) to a 2 wire, loop
powered transmitter.
A 2 wire loop powered transmitter uses 3.7mA of the current
loop to runs its electronics. That's why the 'live zero'
starts at 4.0mA, so that there's some power avialable to
the transmitter's electronics.
There's lots of technologies that cannot run on the limited
power of approximately 3.7mA at 24Vdc. Thermal dispersion
flow meters, most wet cell gas detectors, thermal
ionization detectors, to name a few, which have to be 3 or
4 wire devices in order to have sufficient power to operate.
Carl Ellis
Measure First
| Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
how to rectify the poor signal strength in utrasonic digtial flow meter ,model:ge digital xce868i
how do u calibrate the vacuum transmitter if it shows more reading
I want to buy a seal kit of a pneumatic power cylinder.But I don't know it's specification.So please help me to know its specification.
Boolean algebra
anybody having Qatar Petroleum questions for instrument Technician offshore ....please send me
Give Detail information about plc,dcs,and scada system?
How INtools is useful for routine Instrument maintenance?
1. what is modbus cable? 2. what kind of communication we are using for the interface of DCS, ESD and Third party cabinets? 3. What is serial communication and peer to peer communication?
if in a level tx height is given, how u calculate the ranges of the tx?
we are using centum vp as monitoring with Dell precision work station T3600 but some times PC(s) are restarted automatically . how we can solve this problem? thanks
Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72
all types instrumentation questions want
Programmable Logic control.
1)How many tpes of vibration probe and how many tpyes of vibration. 2)how we can calibrate a vibration probe with tk3 3)what is RMS value in vibration measuring application and how we calculate it.
What is the use of double seated valve?
