Answer / carl_ellis

Given that 2 wire loop powered transmitters need approvals
for use in hazardous areas to be competitive, most, if not
all, transmitters regulate what changes can be made to
their products by limiting what spare parts or updates can
be made to an original product.

A hazardous area approval (FM, ATEX) is granted for the
transmitter as it is submitted to the approval agency.
Changes to the transmitter require re-approval with all the
associated costs of re-approving a device.

Changing the internal firmware or any of the internal
hardware would void the approval on the original device.
That could make the manufacturer liable in case of failure
of the instrument.

Firmware revisions are not offered for the base functions
of field transmitters.

An accessory item, like a digital display, that is not a
core element of the measuring and reporting function can
sometimes be swapped out with other units of different
firmware versions.

Sensor bodies for pressure transmitters and entire
electronic heads can be exchanged, or entire electronic
card assemblies can be exchanged, but firmware updates are
not available for devices that have agency approvals for
hazardous areas.

Software drivers for communications protocols change over
time and matching the firmware revision of a field
transmitter to its DD (Device Descriptor) or EDDL or DTM or
DOF file can be a challenge, but these are software files
used by communicators or PC/modem communication software.
The instrument manufacturer posts these kinds of files on
their web sites for download.

Carl Ellis
Measure First

hello.my friends.i am an electronics & instrumentation engineer.i want to know Q1.why lugs use in instrumentation cable termination? Q2.if limit switch not working what to do?

2 Answers  

---

why we cant transmit the dc current easily

1 Answers  

---

How much flow is passing through 6 inch line? There are no gauge, no any transmitters in line.

3 Answers  

---

What is the exact differences between HART,FOUNDATION FIELDBUS,PROFIBUS?

0 Answers   Jubilant,

---

Controller not working in auto mode?...what are the problem can occur...Pls explain

1 Answers   Aramco,

---

while stroke checking of a linear control valve ,found its travel is in non linear ,what can be possible reason ? ( please answer send in mannanali65@gmail.com) pls pls pls if any body know

2 Answers   JAL International,

---

sir, i preparing hpcl,ongc,barc,hal exams(instrumentation engg)pls send a placement papers

0 Answers  

---

What is fault tolerent system

2 Answers   GNFC,

---

What is super thermocoupal?

0 Answers   Emco,

---

flow transmitter range is 0 -500 mmwcc but the transmitter shows 12 ma for o mmwc instead of 4 ma ...how to solve this problem when we apply 375 mmwc it shows 16 ma

3 Answers  

---

how to calibrate motorized operated valve?

1 Answers   Bilt, Jubilant, SRF,

---

applications of plc in printing and packaging?

0 Answers  

---