Labnet D1100 Bedienungsanleitung

Instruction Manual

Digital Dry Bath

Models D1100 and D1200

Labnet International

PO Box 841

Woodbridge, NJ 07095

Phone: 732 417-0700

Fax: 732 417-1750

email: [email protected]

April2003

1.0 General Specifications

Temperature Range Ambient +5C to 150C

Temperaturedisplayresolution 0.1C 4 digit LED

Temperature uniformity +/-0.2C (at 37C in block)

Temperature accuracy +/-0.3C

Control PI Microprocessor controller

I/O RS232unidirectional

Dimensions (W x D x H) / Weight 20 x 26.5 x 8.3 cm 2.2 kg

Electricalrequirements:

D1100 115V 115V, 50/60Hz, 0.8A, Fuse 1.5A

D1100 230V 230V, 50/60Hz, 0.4A, Fuse 1.5A

D1200 115V 115V, 50/60Hz, 1.2A, Fuse 2.0A

D1200 230V 230V, 50/60Hz, 0.6A, Fuse 2.2A

2.0 Safety Precautions:

- Do not use this product in an explosive environment

- Do not use in the presence of flammable or combustible material

- Do not heat substances that react violently when heated

- Do not touch block when hot or when unit is heating. Use block lifter.

- Do not touch area around block or block well when unit is hot.

- Do not spill liquids into the well area or into the unit side vent holes

- Connect unit only to a properly grounded outlet

Caution: HOT Surfaces that can burn or cause injury.

Use of this product in any manner not specified by the manufacturer or modifica-

tion of the product may cause injury and/or may void the warranty.

3.0 Installation

Upon unpacking Digital Dry Bath, inspect for damages. Shipping damage is the

responsibility of the carrier. Inspect that the following are present: Users manual,

Line cord, Block Lifter.

Select a location that is dry and not subject to drafts or moving air from heating or

air conditioning vents, or air blown by other equipment. Place the unit on a flat,

preferably non-flammable surface. Allow sufficient room around the unit

for access and cooling. Six inches minimum on all sides is suggested.

Plug the unit into a properly grounded outlet. Using the lifter, insert the

block(s) into the well. The unit is now ready for use.

4.0 Controls

- On / Off rocker switch. Back of unit. Turns primary power on and off

- “Start” LED, red. Illuminates when unit is in heating mode, off in temperature set

mode.

- “Set” LED, green. Illuminates when unit is in temperature set mode and

off when in heating mode.

- “Heating”LED, red. Illuminates when unit is in heating mode and unit is actually

applying heat to the block. This LED is on continuously during heat-up and cycles

on and off when the unit is at the set temperature

- “UP” arrow key. Raises set temperature when unit is in set mode.

- “Down” arrow key. Lowers set temperature when unit is in set mode

- “Start / Stop” key. Switches the unit between set and heating mode.

5.0 Operation

Power the unit up with the On / Off switch at the back of the unit. The unit powers

up in set mode. Use the UP arrow and DOWN arrow keys to set the temperature to

the desired operating temperature. Press the “START” key and the unit will begin

heating to the set point.

The unit remembers the last set temperature at power down. However, the

“START” key must be pressed to cause the unit to start heating to that set

temperature.

When first heating up a block, the unit will apply full heat to the block to rapidly

increase the temperature. On this initial heat-up the display will show a temperature

overshoot and then settle back to the set temperature. The actual block temperature

(and sample) however do not overshoot but rise to the set temperature due to the

mass and the natural heat lag time of the block. This control method allows for the

quickest heat up time without temperature overshoot of the sample.

To change temperature set point, press STOP to put the unit back into the tempera-

ture set mode then change the set point with the UP and DOWN arrow keys. Press

the START key to start heating control again.

6.0 Calibration

Calibration allows the unit temperature display to be adjusted or matched to the

temperature of a single sample or to a calibrated thermometer making an indepen-

dent temperature measure of the block.

The Digital Dry Baths are calibrated at the factory at 37C using a standard small-

hole-pattern block. If you are using a block with a high heat loss rate such as a

block with large holes or a platform style block, you may choose to recalibrate the

unit to your specific application. Also, if you are using very loose or odd shaped

vessels, the calibration function can help you match the display temperature to your

actual sample temperature.

To calibrate the unit for a given block or sample, first turn the unit off using the On /

OFF switch. Then place a thermometer of known accuracy* into the block

thermometer hole or a thermocouple or other sensor into your sample. Make sure

there is a good fit between the thermometer and the block or good contact between

any sensor and sample or sensor and block.

To calibrate the block or sample to the display, use the following procedure:

1. Press and hold the START – STOP key then simultaneously power up the unit

with the On / OFF switch.

2. You should hear a “DU-DU-DU.” sound from the dry bath and the display will

have one segment flashing on the left and will show a set temperature.

3. Use the UP and DOWN arrow keys to set the desired temperature at which

you want to calibrate the unit. Then press the START key.

4. Allow time (up to 40 or 50 minutes) for the unit to heat up to your set tempera-

ture and to equilibrate at this temperature. The entire LED display will start

flashing when equilibration is reached.

5. After the entire display has started flashing, read the thermometer (or sensor

meter) and use the UP and DOWN arrow keys to adjust the display to the

thermometer or sensor reading. Then press the START-STOP key.

6. The unit will then begin to automatically adjust its operating temperature to your

original set point with the re-calibration factor included. Allow sufficient time

for the unit to re-equilibrate and then again compare the thermometer or sensor

reading to the calibrated display. They should closely match. If not, repeat the

calibration procedure.

* Thermometers used for calibration purposes should have a written calibration

certificate and be traceable back to NIST or some other certified body. General lab

thermometers are often not accurate enough for calibration work.

7.0 RS232 Interface

The Digital Dry Baths have an RS232 unidirectional data port. An optional software

disk and interface cable are available which allow a user to use a desk top or lap top

computer to record and/or print a record or the temperature profile produced by the

dry bath.

8.0 Troubleshooting Guide / Service (Labnet Service 1-888-LABNET-1)

Problem Explanation / Solution

Display / LEDs do not light up 1. Check power cord & outlet

2. Check ON / OFF switch

3. Check fuse

4. Call service

Unitnotheating 1. Is set point below room temp

2.Is “START”LEDilluminated

3. Press “START” key

4. Call service

Unit display overshoots 1. Normal operation. Display

set point in heat-up overshoots on initial heat-up but block

and sample do not overshoot. See

Operation section of this manual.

Block or Sample temp not 1. Is unit in heating mode

same as display temp. 2. Is unit sitting in draft

3. Check accuracy of thermometer

4. Is thermometer making good contact

5. Follow calibration procedure

9.0 Cleaning and Maintenance

Make sure that the dry bath and block are cool and the power cord disconnected

before performing any cleaning or maintenance. The dry bath may be cleaned with

a moist cloth containing a mild soap solution. Do not immerse the dry bath in water

or any liquid.

The blocks may also be cleaned in a mild soapy solution. Be sure that all items have

thoroughly dried before attempting to connect the cord or use the unit.

Spills: In the event liquid is accidentally spilled into the bath or well area, disconnect

the plug from the outlet and turn the unit upside down to minimize liquid contact

with the internal components. Remove the bottom cover and inspect to assure

liquid has not contacted heater elements, electronic controls, or connectors. Have

qualified service technician clean the unit and replace any damaged parts.

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