GREISINGER GMH 2000 (01) PDF Document

The switch positions control the power and the unit of measurement:

0 = off

1 = °C

2 = °F

The device features 3 four-digit LCD displays to simultaneously display the current value (digit height 12.4 mm) as well as minimum and maximum values (digit heights 7mm each).

In case of the temperatures rising or falling, an arrow pointing upwards or downwards will be displayed at the left-hand side of the current value. This indicates the tendency of the last value measured internally.

If the display shows dotted lines instead of measuring values after the device has been switched on and the segment test is completed, the sensor contact has been interrupted (i.e., the sensor is broken). This assumes a suitable measuring sensor (GTF 601, GES 601, or GOF 601) is plugged in. In such a case, the sensor should be returned for repair.

Please note that the same display reading is shown if the device is switched on without a sensor plugged in, or if the measuring values are either too high or too low for the acceptable measuring range.

The memory will be activated as soon as the device is switched on. Any minimum or maximum value occurring in active mode will be constantly displayed and updated, if necessary. These values will be deleted as soon as the device is switched off.

“BAT” is displayed automatically in case of low battery. Make sure to apply correct operating voltage as a low or damaged battery will lead to measuring inaccuracies. Immediately after “BAT” is displayed, the battery needs to be replaced.

To perform a zero point offset, follow these steps:

1. Achieve the ice water method: Take a container (e.g., a high cup) and put in ice cubes. Fill with tap water until ice cubes are covered.

2. Immerse the sensor as deeply as possible and move around continuously.

3. As soon as the temperature does not drop any further, press the key at the front side of the unit (called “zero point 0.0°C”) using a ballpoint pen tip for approx. 6 seconds.

4. The entire system including the measuring sensor will be offset to 0.0°C respectively 32.0°F.

In case the 0.0°C respectively 32.0°F offset has been carried out incorrectly or by mistake, press the key for approx. 12 seconds to reactivate the value set by the manufacturer.

When connecting an external power pack, make sure not to exceed the permissible operating voltage of the measuring unit (e.g., 9V to 12VDC). The no-load voltage of simple power packs may be too high. It is recommended to use regulated power supply units, such as the power pack GNG09.

Warning: When running the unit although the power supply is damaged (e.g., short circuit of power supply voltage leading to output voltage), the voltages at the unit (e.g., sensor) may be perilous.

Moving the unit from a cold to a warm environment may lead to malfunctions due to condensation. In such a case, it is recommended to wait to allow the unit temperature to adjust to the ambient temperature before re-starting.

If there is any risk whatsoever involved in running it, the unit has to be switched off immediately and to be marked accordingly to avoid re-starting. Operator safety may be a risk if:

– There is visible damage done to the unit.

– The unit is not working as specified.

– The unit has been stored under unsuitable conditions for a longer time.

In case of doubt, please return the unit to the manufacturer for repair and/or maintenance.

Make sure to maintain the unit properly and to operate it in accordance with the specifications listed (do not throw, knock etc.). The socket and probe plug have to be kept clean.

The following accessories can be ordered separately:

Serial interface RS232 compatible: order number GRS232 (Interface adapter complete with technical manual)

Suitable Pt100-sensors (plug-in type): 4-wire, DIN class B (± 0.3°C at 0°C)

– GTF 601 immersion/ air / gas sensor: -200 up to +650°C

– GES 601 insertion sensor for soft plastic materials: -200 up to +650°C

– GOF 601 surface sensor: -50 up to +400°C

Suitable power pack: GNG09 : stabilised power pack (220/240V 50/60Hz; 10VDC/ 120 mA)

Case GKK1200: case with punched foam lining suitable for 1 unit, 3 sensors, spare batteries, etc.