On the data logger end, maybe the multimeter market has something for you. (googled peak capture data logger)
Fluke 287 True RMS Electronics Data Logging Multimeter with TrendCapture @ $760 (Amazon has it for $655)...
A great resource is the massive 3200 page tome, Tony Kuphaldt's Lesson in Industrial Instrumentation, a text book that covers a huge spectrum of practical instrumentation.
You can skip the first dozen chapters on math and electricity and get right into the instrumentation part.
Being pdf, it...
1. Better quality instruments with a thermocouple input will spec what the maximum resistance is, per leg, for a thermocouple input. The spec sheet on my desk for a Honeywell controller has a spec of 100 Ohms per leg for any Type thermocouple. There are charts on the web with resistance per...
Wow, thanks for the memory jog. I hadn't thought about geothermal in decades.
I was doing some SCADA work for an electrochemical research firm in the late 1970's and ate lunch with the electrochemists Glenn, Jim, Carl, and Linda. Their DOE grant was funding tests to find an alloy that...
Magnetic flow meters are inherently velocity meters. It is very common to size a magmeter a pipe size smaller than the line size for two reasons - the velocity increases in the smaller meter tube so the accuracy spec looks better and the smaller the tube, the lower the purchase price.
Any...
The Honeywell UDC2800 is a PID single loop controller. It has a control output rate limiting function which limits the maximum rate of change of the controller output.
The output rate limit is configured separately for upscale rate or downscale rate. The parameter setting is a whole number...
What are you trying to control? Mix concentration? flow rate from each drop?
Whatever parameter you are trying to control, you need an instrument to measure that variable, because that's what PID uses as its input.
I live in the rust belt and my Toyotas use the factory stainless sheet covered lug nuts that become swollen lugnuts. I carry a set of the extractors in each car in case I ever need one 'on the road'. Amazon sells the set of 4 extractors in a plastic case for about $20.
Link
They work. I've...
>the water heater stops working
That means? Water stops flowing through the water heater? The flow coming out of the water heater is a lower flow? The flow coming out of the water heater is cold water, not hot water? Or something else?
>adjust the pressure switch in the heater, but he...
Transit time loves clean liquid but has trouble with any entrained gas in the liquid. Same with suspended solids.
The calculation for fluid velocity is based on sonic velocity of the medium. You might check to see if whatever meter you look at specs the sonic velocity of the medium in use at...
>My question is would we be able to measure just the gauge pressure in the vent downstream of the fan?
Yes, but frequently gauge pressure (GP) transmitters (one pressure port; internally vented to the atmosphere) are not available with a sensing range as low as differential pressure (DP)...
Impulse lines are dead headed so there's no flow to continually add heat over time. But for steam, a water barrier is needed to keep the steam away from the instrument's sensing diaphragm.
Run some horizontal tubing away from the pipe and install a siphon vertically on the end horz tube and...
I'm not sure that the typical "open-collector output" that provides 10's of milliamps to the coil circuit of the SSR are designed to drive two separate SSR's at the same time. I'd check on that.
Depends on where and how the cabling runs and what type of cable is used, as to whether the cable picks up electrical noise.
The couple sites I picked at random for intrinsically safe cable had 3 types of I/S cable, only one of which used twisted pair. All 3 cables were shielded. So even I/S...
Yes, I've had experience with it and its predecessor, the 4150 and with Pactware and PDM. Both Meriams were capable of executing HART instructions via the keyboard. No complaints with those features that I recall.
DD file updates
A 4150 problem was the need to eventually add a DD file. For...
What's the engine speed supposed to do when the clutch disengages? Doesn't the engine have to have a valid 'demand' signal? Isn't an open circuit on the throttle supposed to be an alarm condition?
I searched the SCADAPAK 474 manual here:
Link
for the term "HART".
The term HART appears six times, only in relation to the 6602 HART AI module, which means there's nothing written in that manual about using HART communications.
Searching for the word "protocol" in the same manual, it mentions...
