Firma:              Techne

Modell:            PHC 1

Kommentar:    Dokumente engl.

INTRODUCTION

It is recommended that the user of the PHC-1 should read this booklet thoroughly before attempting to operate the unit.

The aluminium block will accept up to 54 x 0.5m1 capped micro centrifuge tubes which can be rapidly heated and cooled in a set programme between 0°C and 99°C. The temperature setting range of the unit is 0 to 99°C, but operation is within the range 5°C above the temperature of the cooling water to 99°C.

The Techne Heat/Cool Dri-Block® provides a repeatable cycle of up to three independent temperatures and dwell times, user programmed via the integral keyboard and LCD display panel. Up to 63 separate programmes can be stored in the non volatile memory with up to 99 repetitive cycles per programme.

The water cooling System comprises of a primary flow and a secondary flow. The primary flow is used to cool the System rapidly, the secondary flow, being much less, is to increase the losses when operating near to, or below, ambient temperature (assuming the cooling water is well below ambient). All cooling flow is turned off during any heating mode, and the primary flow is only used when changing from a higher to a lower temperature from segment 1 to segment 2, or segment 2 to segment 3. It is therefore important to remember that in any programme, segment 1 should be the highest temperature.

The unit may operate at steady temperatures in the range 30 to 90°C without cooling water, but for cycling programmes, the water is necessary to achieve the high cool down rate. When switched to "NORMAL" operation, the unit only allows the cooling water to flow when the prior set temperature is higher than the new set temperature. When the block temperature is within approximately 2°C of the new set temperature, the primary cooling watet is shut off, control being maintained against the secondary flow if required temperature is less than 40°C.

An extra Programme step is available if required, which has a single segment (denoted by all segment LEDs being illuminated) having a programmable temperature and hold time. This segment is only activated once at the completion of the programmable cycles. If this is not required, enter 0 into the fourth segment time.

An additional feature is incorporated (see Programming) which allows incremental timing in Segment 3.

An Analogue output of temperature (20mv/°C) is accessible by connection to the DIN locket an the rear panel. See Connection Diagram.

Specification

Sample capacity                               54 x 0.5m1 micro centrifuge tubes. The tips of which are     immersed into the block to a depth of 14mm, giving good                                                 thermal contact for small sample tests.

Temperature setting range               0 to 99°C

Ultimate temperature

control precision *                             ± 0.1°C

Temperature display

accuracy                                           ± 1°C

Block uniformity *                              ± 2°C

Holding time                                      9.9 minutes maximum for cycling programme. Infinite for     single temperature.

Number of cycles                             99 maximum

Heating rate                                      0.45°C/second

Cooling rate                                      1°C/second max

Primary water flow                            1 to 3L/min (adjusted at mains input)

rate requirement

Secondary flow                                 Serial No/l: 0.15 to 0.25 L/min

rate requirement                               (adjusted by unit valve)

                                                         Serial No/2 onwards: 0.25 L/min

Size (L x D x H)                                310 x 210 x 106mm

Weight                                              4Kgs

* For units Serial No/1                      These figures apply to segment times greater than 2            minutes.

* For units Serial No/2                      These figures apply to segment times greater than 1            minutes.