Single-Block 96-Well Gradient Thermal Cycler

What is the Single-Block 96-Well Gradient Thermal Cycler?

A single-block 96-well gradient thermal cycler adds a linear temperature gradient across the 12 columns of one 96-well block, for annealing optimisation. It is the right choice for laboratories that need gradient capability in a standard plate format and run one protocol at a time.

Overview

This instrument uses a single 96-well Peltier block with independent control at the left and right sides, producing a linear gradient across 12 columns. Gradient span is commonly 1–30 °C, and set-point accuracy is within about ±0.3 °C at the column centers. Gradient can be used on the annealing step, and on many models also on denaturation or extension. Ramp rates of 3–4 °C/s are standard, with uniformity of ±0.3 °C when gradient is off. Software allows gradient center and span entry, shows calculated column temperatures, and saves gradients within protocols. The design is cost-effective and compatible with standard plates and tubes, but gradient resolution is fixed at 12 columns.

How does it work?

A gradient cycler uses a Peltier block with independently controlled heating and cooling at each end, or multiple thermal zones, to establish a linear temperature profile across the block. A typical range is 1–30 °C, so a 96-well block with 12 columns can test 12 different annealing temperatures in one run, for example 50–65 °C. Temperature sensors along the block feed back to a controller, and the software calculates the actual temperature of every column. Alternative designs use three to six independently controlled zones, which give a defined temperature in each zone rather than a continuous gradient, and improve accuracy of the set points. After the run, amplicons are compared by gel electrophoresis or melt curve to identify the annealing temperature with the highest specific yield.

What are the key features?

• Linear gradient across 12 columns of a 96-well block
• Gradient available on annealing and optional other steps
• Displays calculated temperature for each column
• Standard plate and tube compatibility
• Gradient saved inside the protocol for reuse
• Heated lid with adjustable temperature

What are the technical specifications?

A typical single-block 96-well gradient thermal cycler configuration offers block format of 96 × 0.2 mL wells, gradient span of 1–30 °C, gradient range of 30–99 °C, gradient accuracy of ±0.3 °C at column centers, max ramp rate of 3–4 °C/s and block uniformity (no gradient) of ±0.3 °C. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Single-Block 96-Well Gradient Thermal Cycler is used in annealing temperature optimisation, primer pair screening, polymerase comparison and teaching. Across the wider Gradient PCR class, laboratories also deploy it for primer annealing temperature optimisation, polymerase and buffer comparison and multiplex PCR development.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61010-2-010, ISO 20395, ISO 22174 and CLSI MM19. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Gradient performance should be verified at installation with a multi-point probe at several set gradients, since accuracy at the ends of the block can differ from the center. Keep the block clean and ensure all tubes and plates are fully seated to maintain thermal contact. Use the same plate type for optimisation and routine runs, as wall thickness affects actual well temperature. Record the optimal annealing temperature and the column where it occurred. After optimisation, transfer the protocol to the routine cycler and verify that performance matches, because different blocks may differ slightly. Maintain pre-PCR and post-PCR separation and run no-template controls for every temperature tested.

How do I select the right Single-Block 96-Well Gradient Thermal Cycler?

Select a single-block gradient unit for primer optimisation and general PCR with one program at a time. It is cheaper than multi-zone or dual-block units, but resolves only 12 temperatures. In an RFQ, specify gradient span and accuracy, steps where gradient is allowed, block format, calibration requirement with multi-point probe and whether documentation for gradient verification is needed.

How does it compare with other Gradient PCR variants?

Choose between true linear gradient and multi-zone designs. Linear gradients suit simple primer optimisation with 8 or 12 temperatures, while independent zones give more precise set points and let you run different protocols in different zones. Check the gradient span, maximum temperature difference, number of gradient steps, and whether gradient is available on every cycle step, including denaturation and extension. Consider block format, ramp rate and whether a real-time optical module is needed so melt curves can confirm specificity. Also look at software that displays calculated column temperatures and lets you save gradient conditions with protocols. For shared laboratories, dual-block gradient units add capacity. Verify gradient accuracy with a calibrated multi-point probe.