SafeTemp C1D1 Hot Plate, No Electrical, for Explosion Proof Areas
ABOUT THIS PART
An 18 inch by 12 inch machined aluminum heat exchange plate with no electrical parts of any kind, built in Bend, Oregon. $1,450. Fluid circulates through a channel machined into the body of the plate, so the heater or chiller that drives it sits outside the classified room and only hose crosses the wall.
SPECIFICATIONS
| Type | Fluid heated and chilled aluminum work plate, no electrical |
|---|---|
| Built by | N.B. Oler, in house, Bend, Oregon |
| Working surface | 18 in x 12 in, 216 square inches (457 mm x 305 mm, 1,394 cm2) |
| Overall height | 1.5 in (38 mm) |
| Material | Billet 6061 aerospace grade aluminum, machined |
| Top finish | 320 grit |
| Seal | 1/4 in Buna-N O-ring cord in a machined groove |
| Fastening | 20 stainless socket head screws around the perimeter |
| Feet | Four slip resistant rubber bumpers |
| Rated temperature | 180 F (82 C) |
| Maximum fluid pressure | 20 psi (1.4 bar) |
| Maximum flow | 1 gpm (3.8 lpm) |
| Ports | Two, 1/4 in female NPT, supplied bare |
| Fluids | Water, or water and glycol for sub freezing work. Mineral oil and other thermal fluids on request, subject to gasket compatibility |
| Minimum temperature on plain water | 32 F (0 C). Use a glycol mix below freezing |
| Electrical | None. No element, no thermostat, no controls, no motor, no cord |
| Area classification | Needs no C1D1 certification because it contains no electrical. The recirculator that drives it sits outside the classified space |
| Third party report | None held, and none claimed |
| Shipping weight | 20 lb (9.1 kg) |
| Manifolding | Multiple plates can run from one recirculator on a shared manifold, built to order |
| Higher temperature | Available as a made to order build with a different gasket material and matching thermal fluid |
| Custom sizes | Made to order, including larger footprints. Quoted individually |
| Price | $1,450 |
| Stock | 2 on the shelf |
| Lead time | One to two weeks once stock is gone |
| Not included | Recirculating heater or chiller, and hose |
| Drawing | HotPlate-C1D1-Top revision B, HotPlate-C1D1-Assembly-R1 |
Does it need a C1D1 certification?
No. There is nothing on this plate to certify. No heating element, no thermostat, no controls, no motor, no wiring, no power cord.
Area classification rules exist to keep an ignition source out of a room that may contain flammable vapor, and a passive plate with no electrical parts is not an ignition source. The recirculating heater or chiller that feeds it does carry electrical, and that unit belongs outside the classified space, plumbed in through the wall with soft line. That is the whole design intent: put the heat where you need it and keep the electricity where it is allowed.
We hold no third party certification report on this plate and we do not claim one. If your fire marshal or AHJ wants a statement in writing for a permit file, email info@nboler.com and we will write one describing the plate as passive, unpowered equipment.
It works cold as well as hot
- Hot is the common use: purging and off gassing residual solvent from oil after extraction.
- Cold is the use most people miss. Run from a chiller instead of a heater it becomes a chilled bench for handling and mixing hash rosin without letting the product warm up, which is what extractors working fresh frozen material want.
- Plain water no colder than 32 F (0 C). Below freezing, run a water and glycol mix.
- The 180 F (82 C) ceiling is set by the Buna-N seal, not by the aluminum. Hotter is a made to order build with a different gasket material and a matching thermal fluid.
Specification
| Working surface | 18 in x 12 in, 216 square inches (457 mm x 305 mm, 1,394 cm2) |
| Overall height | 1.5 in (38 mm) |
| Material | Billet 6061 aerospace grade aluminum, machined, not cast and not welded |
| Top finish | 320 grit |
| Seal | 1/4 in Buna-N O-ring cord in a machined groove, 20 stainless socket head screws |
| Rated temperature | 180 F (82 C) |
| Maximum fluid pressure | 20 psi (1.4 bar) |
| Maximum flow | 1 gpm (3.8 lpm) |
| Ports | Two 1/4 in female NPT, one in and one out, on the same end |
| Fluids | Water, or water and glycol below freezing. Mineral oil and other thermal fluids on request, subject to gasket compatibility |
| Electrical | None |
| Shipping weight | 20 lb (9.1 kg) |
| Price | $1,450 |
Both units on the shelf have bare 1/4 inch female NPT ports and that is how they ship. Do not plumb the plate straight into building water pressure. Multiple plates can run off one manifold from a single recirculator when you need more surface area or more work stations, and we build those manifolds to order.
The plate sits on four slip resistant rubber feet.
Stock, lead time, and what it does not do
1 unit on the shelf today at $1,450 each, ready to ship from Bend, Oregon. Once those are gone, build time is typically one to two weeks. Custom sizes are made to order, and a larger plate is a common request, so send your footprint to info@nboler.com.
- It does not generate its own heat or cold. You need a recirculating heater, chiller or combination unit, plus hose. Neither of those is included.
- It is not a stirring hot plate and has no magnetic stirrer.
- It is not stainless steel. It is machined aluminum.
- It is not a pressure vessel, so it is not covered by our ASME certification.
What has to be inside and outside a classified room: Site Requirements and Utilities for a Hydrocarbon System.
| FITS | Fits any C1D1 or C1D2 classified extraction room, and any unclassified lab, because the plate itself carries no electrical. It needs a recirculating heater, chiller or heater chiller unit and hose, neither of which is included, and that unit is meant to sit outside the classified space. Ports are two 1/4 inch female NPT supplied bare, so any 1/4 inch NPT hose fitting will thread in. It does not fit a magnetic stirrer, it does not run on electricity, and it is not a pressure vessel, so it is not covered by our ASME certification. |
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▦ IN YOUR MANUAL
This part appears in the operator manual that ships with your system. The QR code there links to this page.
◈ REFERENCE FOR THIS PART
COMMON QUESTIONS
Does this hot plate need a C1D1 certification?
No. It has no electrical parts at all, so there is no ignition source to certify. Area classification rules govern electrical equipment. The recirculating heater or chiller that feeds the plate does carry electrical and belongs outside the classified room, plumbed in with soft line.
Is it certified C1D1?
No, and we do not claim it is. There is nothing on the plate to certify. If your fire marshal or AHJ wants a written statement for a permit file, email info@nboler.com and we will write one describing the plate as passive, unpowered equipment.
How does it heat if there is no element?
Fluid circulates through a channel machined into the body of the plate. You supply the hot or cold fluid from a recirculator that sits outside the classified space. The plate is a heat exchanger, not a heater.
Can it be used cold?
Yes, and this is the use most people miss. Fed from a chiller it becomes a cold work surface. Extractors working fresh frozen material use it as a chilled bench for handling and mixing hash rosin without letting the product warm up.
How cold can it go?
On plain water, no colder than 32 F (0 C). Below freezing, run a water and glycol mix.
How hot can it go?
180 F (82 C) as built. That ceiling is set by the Buna-N seal, not by the aluminum. We can build it with a different gasket material and a matching thermal fluid for higher temperatures as a made to order item.
What size is the working surface?
18 inches by 12 inches, which is 216 square inches. Overall height is 1.5 inches.
What are the connections?
Two 1/4 inch female NPT ports, one in and one out, on the same end of the plate. They are supplied bare, so any 1/4 inch NPT hose fitting will thread in.
What pressure and flow does it take?
20 psi (1.4 bar) maximum fluid pressure and 1 gpm maximum flow. Do not plumb it straight into building water pressure.
What is it made of?
Billet 6061 aerospace grade aluminum, machined, not cast and not welded. The top face is finished to 320 grit. It is not stainless steel.
Can I run more than one plate?
Yes. Multiple plates can run off a single recirculator on a shared manifold, which is how labs add surface area and work stations without adding more equipment to the room. We build those manifolds to order.
Can you make a bigger one?
Yes, custom sizes are made to order and larger plates are a common request. Send your footprint to info@nboler.com for a quote.
What is not included?
The recirculating heater or chiller, and hose. The plate on its own is what ships.
Is it a stirring hot plate?
No. There is no magnetic stirrer and no moving parts.
Is it ASME certified?
No. It is not a pressure vessel, so pressure vessel code does not apply to it.
What is in stock and how fast can I get one?
Two units on the shelf today at $1,450 each, shipping from Bend, Oregon. After that, build time is normally one to two weeks.