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  • Users: panelman
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  1. panelman

    H2s sensor

    Hi folks I need a H2S sensor that will work in the absence of oxygen. Our gas is 80% Nitrogen, 20% methane 25 ppm H2S, Ideally what I want is something with a 1-5V/4-20mA output that covers the range 0-30 ppm. Everything I've found so far either only works with H2S as a trace in air as they...
  2. panelman

    Tri rated cable short time ratings

    the standard charts say that 50mm tri-rated can do 200A presumably all day for 20 years Does anyone have short time ratings? We need to run a 280A pump for a day. Pump is on softstart and runs for 90 secs about once every 4 hours. Cables would be about 5m long. Gut feel says it will be ok but...
  3. panelman

    Hx & buffer tank

    Gents it's bit of an open question but.... We have a Hx, primary fed by boiler with control by diverting valve, secondary is DHW fed into a storage/buffer tank. Controls temp sensor is attached to buffer tank and there is a circulating pump in the Hx/buffer circuit. at times of low demand is...
  4. panelman

    blowing resistor

    A slightly unusual one……… We have some 1 meg 0.2W smd resistors that are encased in potting compound and need to blow them open circuit down the wires from the outside. Equipment we have available includes a 0-450V Varic and a 0-5kV 5mA flash tester. As most of my previous contact with...
  5. panelman

    Tiny DC motor control

    Gents We normally deal with nice 3 phase 400V motors but have a little project on the books where we need to provide simple speed (pot on the panel door) to a couple of tiny DC motors. They are PM 50V 1.7A 60W. Control can be fairly crude and motors aren’t heavily loaded. Looking around the...
  6. panelman

    acb tray slider mechanism

    Gents I'm looking for replacements for part of the slider mechanism on some acb/mccb trays. The part I need is almost exactly the same shape & size as standard 35mm TS DIN rail except that it’s much thicker, being about 3mm thick rather than the 1mm that DIN rail is. Any leads on a supplier...
  7. panelman

    plc selection

    Gents Wondering if any one can help out here, we have a new little project that, because of the size of the existing case, needs a pcb based plc. The I/O count is tiny, max of 6 dig in, 4 out . It has to look at a sensor and display the number over a range 0-1000 so needs 1 analogue in and...
  8. panelman

    Trouble with generator RCD

    Brain picking time (with apologies for length)……. We have a big three phase generator (BG) & a little single phase one (LG). During the day BG runs and supplies a three phase load and a critical single phase load. At night LG runs and supplies the single phase load only. Both gens have a 30mA...
  9. panelman

    Soft start problem

    Gents I’ve just had a thyristor in a 250A soft start go short circuit, is the conventional wisdom to just replace the failed one or replace all three? Cheers
  10. panelman

    boxster engine fault

    Boxster Porsche engine was running then cut out with the world supply of smoke coming out of the exhaust and wouldn’t turn over on the starter. Also had a pool of oil on the floor. Turns out it is hydrolocked with oil. Dealer says that engine breather failed allowing oil into inlet manifold and...
  11. panelman

    resistance starters

    Guys I have a couple of 30 year old 8 pole 50hp slip ring motors with resistance starters. I know I can short out the brushes and run them off a softstart but does anyone know if there is likely to be enough meat in the sliprings to let me drill & tap some copper braid to them so I can get...
  12. panelman

    Rule of Thumb

    Guys Is there a rule of thumb? (and if not let's create one) Starting a motor on a pump load takes as much energy as running for x mins any advance on 5 mins?
  13. panelman

    radar & cars

    A strange one......my SO goes to Stansted airport to collect the offspring, when they get back to the car it’s a non starter. It turns over fine (as far as I can tell listening to it via mobile phone) but refuses to start. Call the recovery lorry, driver says “we get lots of these, it’s the...
  14. panelman

    Air v Moulded Case

    We have to get an incoming device for a board. Normally it’s easy, 1kA and down get MCCB, 2kA and up get ACB but this one is 1.6kA and ACB and MCCB will both deal with the load current and fault levels. Anybody got a view on other things I should consider in making my choice?
  15. panelman

    Red Lion HMI G3

    Guys Anyone had any experience of comms problems with Red Lion G3 HMIs?
  16. panelman

    compressed air flows

    Guys We have a blower producing 4000 m3/hr of air at 0.3-4 bar which feeds 4 lanes of under water diffusers. Manifold pipe is 24” dia with 8” branches to individual lanes. When the blower is down the plan is to isolate the 8 inch pipes from the manifold and feed air (1m3/min @ 7 bar) from a...
  17. panelman

    air flows, compressors & diffusers

    Guys We have a blower producing 4000 m3/hr of air at 0.3-4 bar which feeds 4 lanes of under water diffusers. Manifold pipe is 24” dia with 8” branches to individual lanes. When the blower is down the plan is to isolate the 8 inch pipes from the manifold and feed air (1m3/min @ 7 bar) from a...
  18. panelman

    AB Activation

    Guys, Just got a shiny new laptop that came without a floppy drive….anyone have any ideas how I can get the AB activation file onto the new machine? Would a USB key work or do I need to get a floppy drive? Cheers
  19. panelman

    AB SLC serial comms, laptop

    Guys We produce panels using AB SLC 505 cpus, the software gets written using our office IP address, when we go to site we change the IP address to match the client network using a serial cable. It’s now time for a laptop upgrade but it seems that serial ports are not fitted to new laptops...
  20. panelman

    LCD display

    My old 21" CRT display is comin to the end of it's life...anyone have any views on an LCD replacement, the Dell 20.5" looks well priced

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