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Hot Plates, Digestion Blocks and Water Analyzers

Corrosion-resistant heating surfaces, uniform block temperatures and unattended programs.

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Laboratory Equipment · 4 models

Digestion starts at the hot surface. LabTech builds three layers of it: open hot plates for beakers and flasks, graphite and aluminum digestion blocks for test tubes, and a dedicated water quality digester for COD, TOC, total nitrogen and total phosphorus. Plate surfaces come in stainless steel, Teflon, graphite or ceramic, so one platform can handle routine acid digestion, high-temperature block programs and corrosive work without the surface failing.

Acid-matched surfaces

Stainless steel, Teflon, graphite or ceramic plates keep the heating surface intact in corrosive work.

Block uniformity

DigiBlock holds well-to-well variation to ±1 °C at 100 °C or 150 °C.

Unattended programs

PID ramps with up to 50 segments run overnight, and the system stores 30 methods.

Split-body safety

The EG series puts the controller outside the fume hood, away from corrosive vapor.

Models

Choose the configuration.

Uniformity is the number that decides whether a batch is comparable. DigiBlock models hold well-to-well variation to ±1 °C at 100 °C or at 150 °C, and insulation cuts energy use by 70% to 80% depending on the model. Programmed PID ramps let a block run unattended, and Lablink wireless control moves method setup, temperature curves and monitoring to an app away from the fume hood.

EH series

Digital hot plate, 200–450 °C

The bench hot plate range: PTFE-coated, stainless-steel or graphite surfaces from 200 °C to 450 °C, with 2,000–2,800 W of heating. Switch, LED or LCD control, and ±1.0 to ±5.0 °C accuracy depending on the model.

PTFE, stainless steel or graphite surface
Ambient to 200 / 350 / 450 °C
2,000–2,800 W heating
Switch, LED or LCD control
40–44 lb, 14–16 in wide

Configurations

Specification	EH20A Plus	EH20B Plus	EH35B	EH45B	EH45C
Part number	LH2011	LH2020	LH2050	LH2110	LH2120
Heating surface	PTFE coating	PTFE coating	Stainless steel	Graphite	Graphite with ceramic coating
Temperature range	Ambient to 200 °C	Ambient to 200 °C	Ambient to 350 °C	Ambient to 450 °C	Ambient to 450 °C
Temperature control	Switch	LCD	LCD	LCD	LCD
Heating power	2,000 W	2,000 W	2,000 W	2,800 W	2,800 W
Temperature accuracy	± 5.0 °C	± 1.0 °C	± 2.0 °C	± 2.0 °C	± 2.0 °C
Dimensions (L×W×H)	16 × 12 × 6 inches	16 × 12 × 6 inches	16 × 12 × 6 inches	14 × 14 × 6 inches	14 × 14 × 6 inches
Weight	40 lbs	40 lbs	40 lbs	44 lbs	44 lbs
Power supply	230 V, 50/60 Hz	230 V, 50/60 Hz	230 V, 50/60 Hz	230 V, 50/60 Hz	230 V, 50/60 Hz

EG split-body series

Split-body hot plate with remote controller

The same heating platform with the controller separated from the plate, so the electronics stay outside the fume hood. Surfaces run from PTFE-coated 200 °C plates to a 370 °C graphite plate, all at 3,000–3,200 W.

Split body keeps controls out of the hood
PTFE, stainless steel or graphite surface
Ambient to 200 / 350 / 370 °C
3,000–3,200 W heating
66–73 lb, 22–24 in wide

Configurations

Specification	EG20A Plus	EG20B	EG35A Plus	EG35B	EG37B
Part number	LH2061	LH2070	LH2081	LH2090	LH2210
Heating surface	PTFE coating	PTFE coating	Stainless steel	Stainless steel	Graphite
Temperature range	Ambient to 200 °C	Ambient to 200 °C	Ambient to 350 °C	Ambient to 350 °C	Ambient to 370 °C
Temperature control	Switch (LED)	LCD	LED	LCD	LCD
Heating power	3,000 W	3,000 W	3,000 W	3,000 W	3,200 W
Temperature accuracy	± 5.0 °C	± 2.0 °C	± 5.0 °C	± 2.0 °C	± 2.0 °C
Dimensions (L×W×H)	24 × 16 × 5 inches	24 × 16 × 5 inches	24 × 16 × 5 inches	24 × 16 × 5 inches	22 × 15 × 8 inches
Weight	66 lbs	66 lbs	66 lbs	66 lbs	73 lbs
Power supply	230 V, 50/60 Hz	230 V, 50/60 Hz	230 V, 50/60 Hz	230 V, 50/60 Hz	230 V, 50/60 Hz

DigiBlock

Aluminium or graphite digestion block

Wrap-around block digestion for test tubes. Aluminium blocks run to 210 °C, graphite blocks to 415–450 °C; capacity is 16 to 54 tubes depending on the model, with ±0.1 to ±1.0 °C accuracy and 1,000–3,000 W of heating.

Aluminium or graphite block
16 / 35 / 36 / 54 tube capacity
Up to 210 °C (Al) or 450 °C (graphite)
±0.1 to ±1.0 °C accuracy
PTFE-coated or graphite exterior

Configurations

Specification	ED16	ED16S	ED36S	ED54S	EHD36	EHD36S
Part number	LH7013	LH7015	LH7016	LH7018	LH7011	LH7017
Max. temperature	210 °C	210 °C	210 °C	210 °C	415 °C	450 °C
Temperature accuracy	±0.2 °C	±0.2 °C	±0.2 °C	±1.0 °C	±1.0 °C	±0.1 °C
Heating power	1,300 W	1,000 W	1,400 W	3,000 W	3,000 W	3,000 W
Sample capacity	16 × 100ml	16 × 100ml	35 × 50ml	54 × 50ml	36 × 50ml	36 × 50ml
Digestion hole (Ø × depth)	44 × 50mm	44 × 50mm	31 × 50mm	31 × 50mm	31 × 50mm	31 × 50mm
Block material	PTFE coating/Al	PTFE coating/Al	PTFE coating/Al	PTFE coating/Graphite	Graphite	Graphite
Dimensions (L×W×H)	39 × 38 × 20cm	38 × 28 × 19cm	42 × 42 × 19cm	54 × 40 × 29cm	40 × 40 × 29cm	54 × 44 × 20cm
Power supply	230 V, 50/60 Hz	230 V, 50/60 Hz	230 V, 50/60 Hz	230 V, 50/60 Hz	230 V, 50/60 Hz	230 V, 50/60 Hz

WD30 water quality digester

Water quality digester for COD, TOC, total nitrogen and total phosphorus

A dedicated digester for water testing. Thirty tubes run at once, and the closed micro-reflux method uses only 3–5 mL of reagent per sample, so fume and secondary waste stay small. Standard methods for COD, TOC, total nitrogen and total phosphorus are built in and called up from the instrument, and the Teflon-coated aluminum heating module resists corrosion.

Processes 30 samples at once
Closed micro-reflux method uses 3–5 mL of reagent per sample
No reagent or sample escapes during digestion
Built-in COD, TOC, total nitrogen and total phosphorus methods
Teflon-coated aluminum heating module, fully corrosion-resistant

Sample capacity	30
Reagent use	3–5 mL per sample, closed micro-reflux
Built-in methods	COD, TOC, total nitrogen, total phosphorus
Heating module	Aluminum with Teflon coating

Specifications compiled from the LabTech US product pages (labtechus.com), retrieved 31 October 2026. Prices excluded; configurations vary by region.

The range

Configurations and accessories.

Applications

Where this range is used.

COD, TOC, total nitrogen and total phosphorus in wastewater
Kjeldahl nitrogen digestion ahead of distillation
Acid digestion of soil and sediment in graphite blocks
Acid digestion of food and feed samples ahead of analysis
Open-beaker evaporation and acid fuming on hot plates

Materials, Geology & Mining →

Questions

Before you buy.

Which hot plate surface should I choose for acid digestion?

LabTech offers stainless steel, Teflon, graphite and ceramic heating surfaces on the EH series, and stainless steel, Teflon or ceramic on the split-body EG series. The choice follows the acids you use and the temperature your method needs: Teflon and ceramic surfaces are the corrosion-resistant options, graphite is used where hot, even block heating matters, and stainless steel covers routine work.

How many samples can a DigiBlock process at once?

The DigiBlock ED/EHD series handles up to 54 samples in one batch. The DigiBlock S/ST series is the higher-temperature graphite option, and the WD30 water quality digester processes 30 tubes at once using closed micro-reflux digestion. All three use the one-stop approach, so digested samples do not need to be transferred before analysis.

Can I run a digestion program without staying at the bench?

Yes. DigiBlock models use intelligent PID program ramps, so a method runs to completion once it starts. Lablink wireless control goes further: the app works remotely, stores up to 30 methods, offers 50 ramp segments with temperature curve and graph display, and can monitor several digesters or instrument types at the same time.