Search results

NEL has 20 page paper, Best Practice Guide: Impulse Lines for Differential-Pressure Flowmeters. http://www.idc-online.com/technical_references/pdfs/instrumentation/Differential pressure meters_nel.pdf (take out any space(s) the forum inserts into the URL) Their table on page 5 shows how ISO...

My crystal ball is cloudy. You don't know until you try it and see. Or you can be conservative and put an isolator in the loop.

Discussions of logic code as intellectual property on the PLCS.net forum seem to conclude that the ownership of the intellectual property of the code depends on the whether the code was developed as 'work for hire' with the customer providing logic descriptions, sequences, and I/O specifics, or...

I'm not sure how common it would be as tank level wet leg fill fluid, but Wika lists its glycol/water capillary fill fluid with a SG of 1.22 www.wika.us/upload/DS_ACC_ACS_90_MO_en_us_17070.pdf

A look at a spec sheet shows that comm protocols are options, so presuming you want to use Modbus you need to check to make sure you have the option code for Modbus (spec sheet shows order codes for updating options). The T2550 can operate as a Modbus slave or a Modbus master. A look at the...

It's fascinating to me that web fora, like this venue, control.com, are not included in the social networking media category. What excludes web fora from social networking category? Who makes the rules? (yeah, I know, the guys with IPO. Money talks.) When an established publisher comes...

Access to Controlinks data . . . The S7810M Modbus module document 65-0249 contains the Modbus register map for the R78xx controller(s), the R7999 registers, and the S7830 first out annunciator (only 2 registers, the first out code and the second, the state bits. Check out page 12 or 14...

The two technologies are a diffusion cell or an equilibrium cell. Which technology are you using now? What's the typical O2 concentration range?

A Rosemount 333 TriLoop is a break-out box for HART. It takes a HART signal an breaks out three HART variables as three 4-20mA signals. The manuals refers to use with a Multivariable or a DP, but I suspect it reads any of the 4 HART variables (primary, secondary, tertiary, quatenary) that...

Presumably, the LRV (4-20mA = 4mA) is at the elevation of the lower tap. The transmitter is mounted 210mm lower than the lower tap. To calculate the LRV, the Specific Gravity (SG) of the lube oil is needed. LRV = 210mm (water column) * SG The elevation of the upper tap is the...

Things to check out: 1) Some wise guy assigned some HART address other than zero to the three devices that don't communicate. 2) The three uncommunicative meters are connected to an analog input whose input resistance is less than 230 ohms. Add some loop resistance. 3) Insufficient...

It depends on how much resistance is being driven at the receiving end, but typically milliamp currents will go hundreds of meters with ordinary industrial copper wiring and a DC power supply supplying the recommended voltage.

Technically, setpoints do not 'hunt'. Setpoints are fixed and the process variable 'hunts' for any number of reasons. The 348 manual is here: http://tinyurl.com/9g6swbj Try retuning the controller. Find the 'gain' and whatever number it is, divide it by 2, enter the lower value, then...

The specs that define the physical layer for RS-485 define the electrical characteristics, not the hardware connectors used. The product manufacturer decides which hardware connector to use, so there's all sorts of variety. I've seen RS-485 on various hardware connectors: screw terminals...

The problem is that you're using RS-232, which can not handle 3 devices. RS-232 is, by definition, a point-to-point communications link for only two devices. Should both your processors attempt to transmit simultaneously, the PC's receive line will have garbage bits on it.

Either the Honeywell Trendview model SX (250mm screen) or the QX (100mm screen) paperless recorders can be run on 24Vdc as an option. Either can have an optional, single digital output card with 16 Form A relays: SPNO, 1A 24VDC (non-inductive, internally suppressed).

If your device has a table of registers, like 40001 or 30012 with a description of what is in the register, then it is a Modbus slave device. If your device has provision for assigning it a slave node ID number, then it is a Modbus slave. Modbus masters do not have ID numbers. Most...

The wise person selects the right flow meter for the application and then handles the issue of multiple identical signals separately. Multiple 4-20S which can easily be done with a signal splitter or multiplier.

dictionary.com defines silica as the dioxide form of silicon, SiO2, occurring especially as quartz sand, flint, and agate: used usually in the form of its prepared white powder. Silica suspended in water? A slurry? Or did you mean silicone, a polymer? And where's all that other data...

I have no idea what error code 5 is, but here's a list of things that can go wrong with serial communications: - slave module address (DIP switch on ZSG, configured on the Wago end) - baud rate same on both ends (DIP switch on ZSG) - parity has to be the same on both ends - RTU is 8...