GREISINGER GMH 3750 User manual

H49.0.02.6B-06

GREISINGER electronic GmbH

D - 93128 Regenstauf, Hans-Sachs-Straße 26

Phone: +49 9402 / 9383-0, Fax: +49 9402 / 9383-33, eMail: info@greisinger.de

Operating Manual Precision Thermometer

as of Version 1.8

Pt100 4-Wire

GMH 3750

H49.0.02.6C-06 Operating Manual GMH 3750 Page 2 of 16

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Contents

1 INTENDED USE .........................................................................................................................................3

2 GENERAL ADVICE ...................................................................................................................................3

3 SAFETY INSTRUCTIONS ........................................................................................................................3

4 OPERATING AND MAINTENANCE ......................................................................................................4

5 CONNECTIONS..........................................................................................................................................4

6 DISPLAY- AND BUTTON ELEMENTS..................................................................................................5

7 START OF OPERATION ..........................................................................................................................5

8 DEVICE CONFIGURATION ....................................................................................................................6

9 SPECIAL FUNCTIONS..............................................................................................................................8

9.1 DISPLAY RESOLUTION ..............................................................................................................................8

9.2 USER SENSOR CURVE ('LIN USER')..........................................................................................................8

9.3 ZERO DISPLACEMENT ('OFFSET') ..............................................................................................................8

9.4 SCALE CORRECTION ('SCALE')..................................................................................................................8

9.5 AVERAGE FILTER („T.AUG“) ...................................................................................................................9

9.6 OUTPUT („OUT“).....................................................................................................................................9

9.7 ALARM („AL.“)......................................................................................................................................10

9.8 REAL TIME CLOCK („CLOC“) ...............................................................................................................10

10 PROBE CONNECTION........................................................................................................................11

11 CALIBRATION SERVICES ................................................................................................................11

12 OPERATION OF LOGGER.................................................................................................................12

12.1 STORING SINGLE MEASUREMENTS („FUNC-STOR“) ...............................................................................12

12.2 AUTOMATIC RECORDING WITH SELECTABLE LOGGER CYCLE TIME „FUNC CYCL“..............................13

13 SOME BASICS OF PRECISION TEMPERATURE MEASURING ...............................................14

14 FAULT AND SYSTEM MESSAGES...................................................................................................15

15 DISPOSAL NOTES ...............................................................................................................................15

16 SPECIFICATION ..................................................................................................................................16

No part of this documentation may without previous written permission of the company

GREISINGER electronic GmbH stored in some form, reproduced, processed,

duplicated or spread become.

H49.0.02.6C-06 Operating Manual GMH 3750 Page 3 of 16

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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.

The device is to be protected against wetness and soiling and has to be stored and operated only

within the permissible environmental conditions and connection data (see “Specification”).

2 General Advice

Read through this document attentively and make yourself familiar to the operation of the device

before you use it. Keep this document in a ready-to-hand way in order to be able to look up in the

case of doubt.

3 Safety Instructions

This device has been designed and tested in accordance to the safety regulations for electronic

devices. However, its trouble-free operation and reliability cannot be guaranteed unless the

standard safety measures and special safety advises given in this manual will be adhered to when

using it.

1. Trouble-free operation and reliability of the device can only be guaranteed if it is not subjected

to any other climatic conditions than those stated under “Specification”.

Transporting the device from a cold to a warm environment condensation may result in a failure

of the function. In such a case make sure

the device temperature has adjusted to the ambient

temperature before trying a new start-up.

2. The circuitry has to be designed most carefully, especially if the device should be connected to

other devices. Internal connection in third party devices (e.g. connection GND and earth) may

result in not-permissible voltages impairing or destroying the device or another device

connected.

3. Warning: Operating the device with a defective mains power supply (e.g. short circuit from

mains voltage to output voltage) may result in hazardous voltages at the device (e.g. at sensor

socket)

4. Whenever there may be a risk whatsoever involved in running it, the device 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 to the device

•the device is not working as specified

•the device has been stored under unsuitable conditions for a longer time

In case of doubt, please return device to manufacturer for repair or maintenance.

Warning: Do not use these product as safety or emergency stop device, or in any other

application where failure of the product could result in personal injury or material damage.

Failure to comply with these instructions could result in death or serious injury and material

damage.

H49.0.02.6C-06 Operating Manual GMH 3750 Page 4 of 16

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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.

The battery has to be taken out, when storing device above 50°C.

Hint: We recommend to remove the battery if device is not used for a longer period of time!

•Mains Operation

Attention: When using a power supply unit please note that operating voltage has to be 10.5 to

12 V DC. Do not apply overvoltage!! Simple 12V-power supplies often have excessive no-load

voltage. We, therefore, recommend using regulated voltage power supplies. Trouble-free

operation is guaranteed by our power supply GNG10/3000.

Prior to connecting the plug power supply with the mains supply make sure that the operating

voltage stated at the power supply is identical to the mains voltage.

•Treat device and probes carefully. Use only in accordance with above specification. (do not

throw, hit against etc.). Protect plugs and sockets from soiling.

•To disconnect sensor plug do not pull at the cable but at the plug.

•When connecting the probe the plug will slide in smoothly if plug is entered correctly.

Selection of Output-Mode: The output can be used as serial interface or as analogue output. This

choice has to be done in the configuration menu.

5 Connections

1 Probe connection: 4 pole Mini-DIN-Socket, for Pt100 4-wire probes (see also chapter 10)

2 Output: 3-pole stereo phone socket Ø3mm

Operation as interface: Connection to optically isolated interface adapter (accessory: USB 3100,

GRS 3100, ..)

Operation as analogue output: Connection via suitable 2pole cable.

Attention: The output mode has to be configured (see chapters 8, 9.6) and influences battery life!

The mains socket is located at the left side of the instrument

H49.0.02.6C-06 Operating Manual GMH 3750 Page 5 of 16

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6 Display- and Button Elements

) 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. or hold value is displayed in

the auxiliary display

4 „Offset“ arrow: indicates that zero point offset is activated

5 „Corr“ arrow: indicates that a scale correction is activated

6 „Logg“ arrow: Shown if logger function is selected,

flashes if cyclic logger is running

7 „Alarm“ arrow: Flashes if alarm is present

b) Pushbuttons and Operation

Key 1:

On/Off

Key 2:

press shortly: maximum measured value will be displayed

press for 2 sec.: the max. value will be deleted

Key 3:

Function only during configuration: Selection of menu-parameter

Key 4:

press (Menu) for 2 sec.: configuration will be activated

Key 5:

press shortly: minimum measured value will be displayed

press for 2 sec.: the min. value will be deleted

Key 6:

Measurement: Hold current measuring value ('HLD' in display) or operation of logger

functions (p.r.t. Chapter 12)

7 Start of Operation

Connecting Temperature probe to the instrument.

Switch instrument on with key 1 „ON OFF”

The device is ready to measure.

H49.0.02.6C-06 Operating Manual GMH 3750 Page 6 of 16

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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.

Enter Configuration:

Press for 2 seconds.

The main menu will be

shown

Navigation: choose menu branch (*1)

choose the parameter (*2)

/ edit the parameter values (*2)

Stores the settings, jumps back to the main menu

Stores the settings, leaves configuration

Menu(*1) Parameters/Values (*2) Meaning p.r.t.

Read Logg: single value-logger read out

(only when data existing! Please refer to chapter 12)

Set Configuration: Generic Settings

°C: All temperature values are in degrees Celsius

°F: All temperature values are in degrees

Fahrenheit

0.1° / 0.01°: Resolution 0.1° / 0.01°

Auto: Resolution is selected automatically

*9.1

E.751 characteristic curve according to EN60751

USEr User sensor curve (Predefined to EN60751

values, changeable by software GMHKonfig)

*9.2

-2.50...2.50°C /

-4.50...4.50°F

Zero correction

oFF: Zero displacement inactive (=0.0°)

*9.3

-2.000...2.000: Scale correction [in %]

oFF: Scale correction factor inactive (=0.000)

*9.4

1...30: Average filter (period in seconds)

oFF: Average filter inactive

*9.5

1...120 Power-off delay in minutes. Device will be

automatically switched off as soon as this time

has elapsed if no key is pressed or no

interface communication takes place

oFF Power-off function inactive (continuous

operation)

oFF: No output function

SEr: Output is serial interface

dAC: Output is analogue output

9.6

H49.0.02.6C-06 Operating Manual GMH 3750 Page 7 of 16

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01,11..91 Base address of device for interface

communication

9.6

-200..850°C /

-328...1562°F

Zero point of analogue output: Temperature at

which the analogue output potential should be

9.6

-200..850°C /

-328...1562°F

Scale of analogue output : Temperature value

at which the analogue output potential should

be 1V

9.6

Set Alarm: Setting of Alarm Function

On / No.So Alarm on with horn-sound / Alarm on without

horn-sound

OFF no alarm function

-200°C ...

AL.Hi

Min alarm rail (not when AL. oFF)

AL.Lo ...

850°C

Max alarm rail (not when AL. oFF)

9.7

Set Logger: Setting of Logger Function

CYCL Cyclic: logger function cyclic logger

Stor Store: logger function individual value logger

OFF No logger function

*12

0:01... 60:00 Cycle time of cyclic logger [minutes:seconds] *12

Set Clock: Setting of Real Time Clock

HH:MM Clock: Setting of time hours:minutes

YYYY Year

TT.MM Date: day.month

9.8

(*) If the logger memory contains data already, the menus/parameters marked with (*)

can not be invoked! If these should be altered the logger has to be stopped and the

memory has to be cleared before!

Hint: Restoring of ex-works settings

The settings will be set to the settings ex works, if keys ‘Set‘ and ‘Store‘ are pressed

simultaneously for more than 2 seconds.

H49.0.02.6C-06 Operating Manual GMH 3750 Page 8 of 16

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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. In such a case please set the optimum resolution to the desired

value.

9.2 User Sensor Curve ('Lin USEr')

By means of this function besides the standard conversion of resistance to temperature following

EN60751(Lin E.751) also other curves can be used. The user sensor curve can be read and edited

by the configuration software GMHKonfig. The standard setting ex works is also set to the

EN60751 data. The curve is defined by a table with two columns (input resistance[Ohm]/output

temperature [°C]) with 50 rows.

Info: the sensor curve following EN60751 uses the international temperature scale ITS90 and

following formulas:.

Temperatures < 0°C:

neg

(T) := 100 · [1 + 3.9083·10

-3

·T – 5.775·10

-7

·T

– 4.183·10

-12

·(T – 100)·T

]

Temperatures >= 0°C:

pos

(T) := 100 · (1 + 3.9083·10

-3

·T – 5.775·10

-7

·T

)

Please notice: Temperature measurements with the user sensor curve are allowed only within

the temperature range which has been used to generate the user sensor curve.

Measuring with activated user sensor curve beyond the checked temperature range may

lead to larger errors. Therefore the sensor curve acc. to EN 60751 (Lin E.751) has to be

used for temperature measurements beyond the checked temperature range.

9.3 Zero Displacement ('Offset')

The zero displacement is used to adjust the measuring display for probe deviations.

temperature displayed = temperature measured - offset

Standard setting: 'off' = 0.0°, i.e. no zero displacement will be carried out. Together with the scale

correction (see below) this factor is mainly used to compensate for sensor deviations.

Unless the factor is set to 'off', the offset arrow in the display shows an active zero displacement.*)

9.4 Scale Correction ('Scale')

The scale correction is used to adjust the measuring display for probe deviations. (factor is in %):

displayed temperature[°C] = measured temperature[°C] * (1+Scal/100)

or: displayed temperature[°F] = (measured temperature [°F]-32°F) * (1+Scal/100) + 32°F

Standard setting: 'off' =0.000, i.e. temperature is not corrected.

Unless the factor is set to 'off', the Corr arrow in the display shows an active scale correction.*)

*) The standard curve (Lin E.751) and the user sensor curve (Lin USEr) posses separate

correction settings.

H49.0.02.6C-06 Operating Manual GMH 3750 Page 9 of 16

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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.

9.6 Output („Out“)

The output can be either used as serial interface (for USB 3100, GRS 3100 or GR S3105 interface

converters) or as analogue output (0-1V). If none of both is needed, we suggest to switch the

output off, because battery life then is extended

a) Operation as analogue Output („Out dAC“)

With the DAC.0 and DAC.1 values the output can be rapidly scaled to Your efforts.

Example: -50°C ... 250°C should correspond to 0 ... 1V at the output

Set “DAC.0” to –50.00°C and “DAC.1” to 250.0°C -> finished.

Keep in mind not to connect low-resistive loads to the output, otherwise the output value will be

wrong and battery life is decreased. Loads above ca 10kOhm are uncritical.

If the display exceeds the value set by DAC.1, then the device will apply 1V to the output

If the display falls below the value set by DAC.0, then the device will apply 0V to the output

In case of an error (Err.1, Err.2, no sensor, etc.) the device will apply slightly above 1V to the

output.

Plug wiring:

GND

+Uout

Attention!

The 3

contact has be left floating

Only stereo plugs are allowed!

b) Operation as interface („Out SEr“)

By using an electrically isolated interface converter USB 3100, GRS 3100 or GRS 3105

(accessory) the device can be connected to a PC.

Configure Base address ('Adr.'): With the GRS 3105 it is possible to connect up to 5 instruments

to a single interface. In this case the devices have to have different addresses, eg. Device 1:

address 01, device 2: address 11, device 3: address 21 ...

In order to avoid transmission errors, there are several security checks implemented (e.g. CRC).

The following standard software packages are available for data transfer:

!EBS9M: 9-channel software to record and display the measuring values

!GSOFT3050: operation and read out software for devices of GMH3000 series with logger

!GMHKonfig: free set-up software

In case you want to develop own software we offer a GMH3000-development package including

!An universally applicable Windows function library ('GMH3000.DLL') with documentation that

can be used by all serious programming languages. Applicable for Windows 95 / 98™,

Windows NT™, Windows2000™, Windows XP™ and VISTA

Programming examples for Visual Basic 6.0™, Delphi 1.0™, Testpoint™, Labview™ and others

H49.0.02.6C-06 Operating Manual GMH 3750 Page 10 of 16

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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. values 204 Read decimal point of display

7 Read max values 208 Read channel count

12 Read ID-no 214 Read scale correction

22 Read min. alarm rail 215 Set scale correction

23 Read max. alarm rail 216 Read zero displacement

217 Set zero displacement

222 Read power – off time

32 Read configuration flag

Alarm function: 1, Alarm horn: 3

BitLoggerOn: 50, BitCyclicLogger: 51 223 Set power – off time

102 Set min. alarm rail 224 Logger: read data cyclic logger

103 Set max. alarm rail 225 Logger: read cycle time (LoGG - CYCL)

160 Set configuration flag (see 32) 226 Logger: set cycle time (LoGG - CYCL)

174 Delete min. value 227 Logger: start recording

175 Delete max. value 228 Logger: read # of data

176 Read min. measuring range 229 Logger: read status

177 Read max. measuring range 231 Logger: read stop time

178 Read measuring range unit 233 Read real time clock (CLOC)

179 Read measuring range decimal point 234 Set real time clock (CLOC)

180 Read measuring type 236 Read logger memory size

194 Set display unit 240 Reset

199 Read measuring type in display 254 Read program identification

200 Read min. display range 260 Logger: read data manual logger

Note: The measuring and display range values read via interface are always in the selected

display unit (°C/°F)!

9.7 Alarm („AL.“)

There are three possible settings:

Alarm off (AL. oFF), on with horn sound (AL. on), on without horn sound (AL. no.So).

Following conditions will display an alarm, when the function is activated (on or no.So):

-Value is below lower (AL. Lo) or above upper alarm rail (AL.Hi).

-Sensor error

-Low battery (bAt)

-Err.7: System error (always with sound)

In case of an alarm and when polling the interface the “prio”-flag is set in the returned message.

9.8 Real Time Clock („CLOC“)

The real time clock is used for the logger function: Recorded values are also containing the point of

time, when they were measured. Please check the settings when necessary.

If the battery was replaced the referring menu ‚CLOC‘ will automatically be started

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