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Yes, Patrick, good list of questions. I'd ask the same questions, but I'm jaded after 20 years of typing all those questions out, only to never get a single response from the OP. So, I now tend to limit my response to a couple quick questions to see if the OP is even engaged.

> I presume the engine would be producing heat and PID controller would be controlling cooling water. To increase temperature, controller output would need to decrease water flow. Good point, I didn't think hard enough. it's a cooling loop, not a heating loop (unless it's a preheater from a...

Interesting question. I'm interested in the replies.

Did it ever work properly? What's the controller's output signal driving? Is the controller's output at 100%? Can you put the controller into manual mode and force the output to 100%? Does the temperature then increase?

I'm not sure what device we're talking about 7 years after the first post. In general, there are closed feedback control loops using a motor position signal and open feedback control loops using timing which 'assumes' a given motor actuator time duration/interval, say 2 seconds, will drive the...

I have zero experience with in-line ultrasonic transit time flow meters, but lots of experience with clamp-on, external transit time flow meters. Transit time technology loves clean liquid, and will fault or fail on bubbles or suspended solids (which doppler flow meters love). Clamp-on...

Radar, whether guided wave (rod or rope), pulse (non-contact) or FMCW (non-contact) by nature, provides a continuous level signal. I suppose somewhere in the world, some vendor could offer a point level radar, but I haven't run into it yet. Is the O&G prohibition based on using continuous...

Modbus RTU is the formal name for serial Modbus over RS-485, not to be confused with an RTU device. One Modbus rule is that a Modbus slave cannot initiate a Modbus message exchange; only a Modbus master can initiate a message exchange. HMI's are typically Modbus RTU masters because a change...

Is Modbus running on RS-485 or Ethernet?

Welcome to the world of Modbus where there is no "plug 'n play", and everything is a project. What does the 2nd sentence on page 35 of the DPS20 panel meter say? https://assets.omega.com/manuals/4992_M5760_2003_DPS20.pdf "Enables protocol function ‘4’ (‘Read Input Registers’) to access the...

A quick read of Baseblock's Comtest Pro software shows that it functions as Modbus Master/client, not as a slave server. To test your your master you need to use Modbus server/slave software. Here's some options for Modbus slave/server simulator Windows apps 1. PeakHMI Modbus TCP/IP slave...

Look for the download button for Chipkin's Modbus scanner that can search a range of slave ID numbers looking for a response. https://store.chipkin.com/products/tools/cas-modbus-scanner See the Modbus Scanner Quick user Guide instructions on the same page: Locate 'Device" These numbers are...

Since the sensors were connected via daisy chain, only one comm port was in use, so all the sensors used the same serial comm settings, baud rate, parity, stop bit. So what worked successfully for one sensor using Modpoll should work for the other sensors. You don't have to guess or experiment...

I am not familiar with sensing the DP across a drain pot. Is the DP the level in the drain pot? Can you show a sketch of a typical drain pot, where and who the DP cell and its impulse tubes are located and connected ? Does the pump directly drain a drain pot, by design or by accident...

Surrounding atmosphere. Pilots are not installed in airtight enclosures.

Check the configuration for a low flow cutoff parameter and enable it if it is not currently enabled.

I ran into a US made Ideal 61-337 DVM, which has a time limit of 1 minute for DC mA measurements:

The spec for Ethernet is a performance spec, in other words, for a given Ethernet speed, a 100m cable will support so many bits per second. That does not mean that the signal dies if the cable is 102m in length instead of 100.0 meters in length. The longer length means that the...

You don't provide identification of which instrument is in question, so "generic-isity" will have to apply. E&H Micropilot's radar level unit's manual at https://portal.endress.com/wa001/dla/5000619/7893/000/02/BA01121FEN_0316.pdf on page 101 lists F283 error as a high level, diagnostic...

I can only suggest checking to see if the part number on the card matches the hazardous service rating of the positioner and checking to see that the ribbon cable is connected in the right position on AOM card.