OHAUS Guardian 5000 Dry Synthesis Kits combine the e-G52HSRDA round-top hotplate stirrer with an anodized aluminum block sized for round-bottom flasks. They include a PT1000 temperature probe, probe holder and flask clamp. The block transfers heat from the 135 mm hotplate into the flask, so you can heat and stir reactions without an oil bath or heating mantle. There's no hot oil to spill, clean up or dispose of.
Three kits are available, sized for 250 mL (Kit 2A), 500 mL (Kit 2B) or 1000 mL (Kit 2C) flasks. All run on 120 V. They're used in chemistry and synthesis labs, pharmaceutical and materials research, and universities and colleges. Guardian 5000 synthesis kits are available in Canada from Cambridge Environmental Products with CAD pricing and Canadian purchasing support.
The anodized aluminum block (6082 T651 alloy) conducts heat from the hotplate into the flask. There's no oil to heat up, spill or dispose of, and no water bath to top up. The anodized finish is chemical and solvent resistant.
The kit includes a stainless steel PT1000 Class A probe. With the probe placed in the reaction, the hotplate controls to the sample temperature rather than the plate temperature, in 0.5 °C steps. OHAUS lists probe accuracy of ±0.2 °C plus the PT1000 Class A tolerance.
The e-G52HSRDA stirs from 50 to 1800 rpm with ±2% speed stability and handles up to 20 L of water. That's more than enough for a 1 L flask.
SafetyHeat™ uses two independent controls to monitor the electronics and shut off heating before overtemperature. Run Dry Protection stops heating and sounds an alarm if the probe isn't in the sample during probe-controlled heating. The hotplate also has a hot-top indicator, an audible alarm and an IP32-rated metal housing.
A timer runs from 1 minute to 99 h 59 min for unattended runs. The built-in RS232 port lets you log data or control the unit remotely.
Choose the Kit by the largest round-bottom flask you'll use. Each kit includes the hotplate stirrer, one base block, the PT1000 probe, the probe holder and a flask clamp.
| Kit | Model | OHAUS Item | Base Block for | Max Flask Diameter | Block Weight |
|---|---|---|---|---|---|
| Kit 2A | G52HSRDA K-2A | 31076459 | 250 mL flask | 85.4 mm | 1.51 kg |
| Kit 2B | G52HSRDA K-2B | 31076460 | 500 mL flask | 105.5 mm | 2.05 kg |
| Kit 2C | G52HSRDA K-2C | 31076461 | 1000 mL flask | 131.3 mm | 2.22 kg |
| Item | Details |
|---|---|
| Hotplate stirrer | OHAUS Guardian 5000 e-G52HSRDA, 120 V, 135 mm round ceramic-coated aluminum top plate |
| Base block | Anodized 6082 T651 aluminum alloy with two heat-resistant handles, sized for 250, 500 or 1000 mL (depending on kit) |
| Temperature probe | Stainless steel PT1000 Class A (OHAUS 30500590), −40 °C to 400 °C |
| Probe holder | Stand rod, double clamp and probe-holding arm (OHAUS 30973298) |
| Flask clamp | Stainless steel, 9.5–50 mm grip range, with attached double clamp |
| Application | How the Kit Helps |
|---|---|
| Synthesis and reflux | Probe-controlled heating and stirring in round-bottom flasks without an oil bath. |
| Replacing oil baths | No hot oil to spill, ignite or dispose of; the block cleans easily. |
| Long or overnight runs | Timer, SafetyHeat and Run Dry Protection for unattended operation. |
| Data logging | RS232 output for recording temperature and run conditions. |
| Top plate | Ø 135 mm (5.3 in), ceramic-coated aluminum, round |
| Heating power | 600 W (120 V) |
| Plate temperature range | Ambient +5 °C to 360 °C |
| Setting resolution | 0.5 °C |
| External probe | PT100 or PT1000 Class A; accuracy ±0.2 °C + probe Class A tolerance |
| Speed range | 50–1800 rpm, ±2% stability |
| Max stirring volume | 20 L (water) |
| Timer | 1 min to 99 h 59 min |
| Display | Backlit LCD, 115 × 30 mm |
| Interface | RS232 (USB and Ethernet kits optional) |
| Protection | IP32 |
| Dimensions (L × W × H) | 259 × 175 × 108 mm (10.2 × 6.9 × 4.3 in) |
| Net weight (hotplate) | 2.6 kg (5.7 lb) |
| Power | 100–120 V, 8 A, 50/60 Hz |
| Operating environment | 5–40 °C, up to 80% RH, non-condensing |
| Safety standards | OHAUS lists UL 61010 series and CAN/CSA C22.2 among the standards for the Guardian 5000 series |
| Kit 2A (250 mL) | Kit 2B (500 mL) | Kit 2C (1000 mL) | |
|---|---|---|---|
| Diameter without handles | 121.6 mm | 141.4 mm | 162.3 mm |
| Diameter with handles | 225 mm | 245 mm | 265 mm |
| Height | 44.2 mm | 54.6 mm | 65.5 mm |
| Recess depth | 36.8 mm | 46.7 mm | 62.2 mm |
| Max flask diameter | 85.4 mm | 105.5 mm | 131.3 mm |
| Weight | 1.51 kg | 2.05 kg | 2.22 kg |
| Max working temperature | 300 °C | 300 °C | 300 °C |
Hotplate specifications are from the OHAUS Guardian 5000 e-G52 data sheet. Base block and kit contents are from OHAUS synthesis kit information published by OHAUS distributors. Contact Cambridge for the OHAUS kit data sheet.
Cambridge Environmental Products is a Canadian-owned laboratory supply distributor based in Ontario and has served Canadian labs since 1993. We supply OHAUS Guardian 5000 hotplate stirrers and synthesis kits with CAD pricing and shipping across Canada. We work with chemistry and research laboratories, pharmaceutical and materials labs, and universities and colleges, and can help with quotes and choosing the right kit. Browse our lab equipment collection for more.
It's a hotplate stirrer paired with a solid aluminum block that holds a round-bottom flask. The block heats the flask directly, replacing an oil bath or heating mantle.
Only the base block size: 2A fits a 250 mL flask, 2B a 500 mL flask and 2C a 1000 mL flask. The hotplate, probe, probe holder and flask clamp are the same.
Yes, with insert blocks that fit inside the base block, down to 25 mL. Inserts are sold separately. Contact Cambridge for options and pricing.
The hotplate goes up to 360 °C, but the aluminum blocks are rated to 300 °C working temperature.
Yes. Each kit includes a stainless steel PT1000 Class A probe (−40 °C to 400 °C) and a probe holder.
Yes. Remove the block and use the e-G52HSRDA as a standard 135 mm round-top hotplate stirrer.
Yes. Cambridge Environmental Products supplies OHAUS Guardian 5000 synthesis kits across Canada with CAD pricing.
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