H49.0.02.6B-06 Operating Manual Precision Thermometer as of Version 1.8 Pt100 4-Wire GMH 3750 GREISINGER electronic GmbH D - 93128 Regenstauf, Hans-Sachs-Straße 26 Phone: +49 9402 / 9383-0, Fax: +49 9402 / 9383-33, eMail: info@greisinger.
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 2 of 16 _______________________________________________________________________________ Contents 1 INTENDED USE .........................................................................................................................................3 2 GENERAL ADVICE...................................................................................................................................
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 3 of 16 _______________________________________________________________________________ 1 Intended Use The GMH 3750 is a precision thermometer for the measurement of the temperature with exchangeable 4-wire Pt100 temperature sensors. With high resolution and precision temperature values can be measured from -200 to 850 °C.
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 4 of 16 _______________________________________________________________________________ 4 Operating and Maintenance • Battery Operation The battery has been used up and needs to be replaced, if „bAt“ are shown in lower display. The device will, however, continue operating correctly for a certain time. The battery has been completely used up, if ´bAt´ is shown in the upper display.
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 5 of 16 _______________________________________________________________________________ 6 Display- and Button Elements a) Display Elements 1 Main Display: Currently measured temperature 2 Auxiliary Display: Display of min, max or hold values Special display elements: 3 Min/Max/Hold: shows if a min., max.
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 6 of 16 _______________________________________________________________________________ 8 Device Configuration Note: Some menu items will be shown depending on the actual device configuration (e.g. some items are disabled when the logger contains data). Please note the hints by the menu items. Press for 2 seconds.
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 7 of 16 _______________________________________________________________________________ Base address of device for interface communication Zero point of analogue output: Temperature at -200..850°C / which the analogue output potential should be -328...1562°F 0V Scale of analogue output : Temperature value -200..850°C / at which the analogue output potential should -328...
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 8 of 16 _______________________________________________________________________________ 9 Special Functions 9.1 Display Resolution Standard setting: 'Auto', i.e. the device automatically switches over to the optimum resolution between .01° and 0.01°. If temperatures to be measured are near the switching threshold, a fixed resolution may be better, e.g. for easy manual recording.
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 9 of 16 _______________________________________________________________________________ 9.5 Average filter („t.AuG“) The filter forms the arithmetic floating average over the entered time. The displayed value will be correspondingly slower in this case. 9.
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 10 of 16 _______________________________________________________________________________ Supported interface functions with 'GMH3000.DLL' : code name / function code name / function 0 Read nominal values 201 Read max. display range 3 Read system status 202 Read unit of display 6 Read min.
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 11 of 16 _______________________________________________________________________________ 10 Probe Connection The device is constructed and optimised for the connection of a Pt100 4-wire probe via 4 pole Mini-Din connectors. 4-wire connection Pt100 Figure shows upon probe jack pins It is also possible to connect an 3- or 2-wire probe to the device.
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 12 of 16 _______________________________________________________________________________ 12 Operation Of Logger The device supports two different logger functions: „Func-Stor“: manual recording via keypress “Store” (key 6).
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 13 of 16 _______________________________________________________________________________ 12.
H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 14 of 16 _______________________________________________________________________________ 13 Some Basics Of Precision Temperature Measuring Probe Precision/Device Precision The device is very precise (please refer to technical data). To be able to use this high precision, the connected temperature probe has to be as precise as possible, too.
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H49.0.02.6C-06 Operating Manual GMH 3750 _____________________________________________________ Page 16 of 16 _______________________________________________________________________________ 16 Specification Pt100 4-wire (2 or 3-wire possible) According to EN60751 or with user-sensor curve (table of 50 rows) 4pole Mini-DIN socket Probe connection Measuring Ranges 0,01°C: 0,1°C: 0,01°F: 0,1°F: -199,99...199,99 -200,0...850,0 -199,99...199,99 -328,0...
