GHM GREISINGER G 1910 Series User manual

Quick reference guide
G 1910 series
Compact CO2monitor with alarm
EN

Table of contents G 1910 series
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Table of contents
1 About this documentation......................................................4
1.1 Foreword........................................................................................4
1.2 Legal notices..................................................................................4
1.3 Further information.........................................................................4
2 Safety.......................................................................................5
2.1 Explanation of safety symbols ........................................................5
2.2 Foreseeable misuse .......................................................................5
2.3 Safety instructions..........................................................................7
2.4 Intended use...................................................................................7
2.5 Qualified personnel.........................................................................8
3 The device at a glance............................................................9
3.1 Display elements............................................................................9
3.2 Connections ...................................................................................9
3.3 Operating elements......................................................................10
4 Operation...............................................................................11
4.1 Opening the configuration menu...................................................11
4.2 Call-up of the expanded settings menu.........................................13
5 Measurement Basics.............................................................14
5.1 NDIR CO2 sensor..........................................................................14
5.1.1 Explanation...................................................................................14
5.1.2 Charge status display...................................................................14
5.1.3 Measurement stability...................................................................14
5.2 Alarms..........................................................................................15
5.3 Special functions ..........................................................................15
5.3.1 8 hour average value TWA („time-weighted-average”)..................15
5.3.2 15 minute average value STEL („short-term exposure limit”) ........15
6 Operation and maintenance.................................................16

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6.1 Operating and maintenance notices..............................................16
6.2 CO2calibration .............................................................................16
6.2.1 1-point adjustment........................................................................17
6.2.2 2-point adjustment........................................................................18
6.2.3 Basic sensor adjustment...............................................................19
6.2.4 Notes on the use of the gas sampling extraction device................20
6.3 Battery..........................................................................................21
6.3.1 Charge status display...................................................................21
6.3.2 Charging the batteries ..................................................................21
6.3.3 Rechargeable battery replacement...............................................21
7 Error and system messages.................................................23
8 Technical data .......................................................................25
9 Disposal.................................................................................26
10 Service ...................................................................................27
10.1 Manufacturer................................................................................27
11 Accessories...........................................................................27

1 | About this documentation G 1910 series
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1 About this documentation
1.1 Foreword
_
Read this document carefully and familiarise yourself with the operation of the device
before you use it.
Keep this document ready to hand and in the immediate vicinity of the device so that it
is available to the personnel/user for reference at all times in case of doubt.
The user must have carefully read and understood the operating manual before begin-
ning any work.
1.2 Legal notices
The liability and warranty of the manufacturer for damages and consequential dam-
ages are voided with misuse, disregarding this document, disregarding safety notices,
assignment of inadequately qualified technical personnel and arbitrary modifications of
the device.
This document is entrusted to the recipient for personal use only. Any impermissible
transfer, duplication, translation into other languages or excerpts from this operating
manual are prohibited.
The manufacturer assumes no liability for print errors.
1.3 Further information
_
Software version of the device:
–V1.9 or later
_
For the exact product name, refer to the type plate on the rear side of the device.
_
NOTE
For information about the software version, press and hold the ON button to switch on
the device for longer than 5 seconds. The series is shown in the main display and the
software version of the device is shown in the secondary display

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2 Safety
2.1 Explanation of safety symbols
_
DANGER
This symbol warns of imminent danger, which can result in death, severe bodily injury,
or severe property damage in case of non-observance.
_
CAUTION
This symbol warns of potential dangers or harmful situations, which can cause damage
to the device or to the environment in case of non-observance.
_
NOTE
This symbol indicates processes, which can have a direct influence on operation or
can trigger an unforeseen reaction in case of non-observance.
2.2 Foreseeable misuse
_
The fault-free function and operational safety of the device can only be guaranteed if
applicable safety precautions and the device-specific safety instructions for this docu-
ment are observed.
If these notices are disregarded, personal injury or death, as well as property damage
can occur.
_
DANGER
Incorrect area of application!
In order to prevent erratic behaviour of the device, personal injury and property dam-
age, the device must be used exclusively as described under intended use.
–Do not use in safety / Emergency Stop devices!
–The device is not suitable for use in explosion-prone areas!
–The device must not be used for diagnostic or other medical purposes on pa-
tients!
–The device is not intended to come into direct contact with food!
–For measurements requiring devices that are subject to authorisation or special
approvals, this device is not a substitute for such devices and can only be used
as an aid in preparatory or comparison measurements!

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_
DANGER
Danger due to elevated CO2concentration
The device is not suitable for use as personal protective equipment (PPE) with ele-
vated CO2levels. However, it can indicate an elevated CO2value. The measured
value appears in the display as a % or ppm value.
G 1910-02
G 1910-20
CO2concentration
Effect
%
ppm
20
Death within a few seconds
10
Loss of consciousness, death, dizzi-
ness, vomiting, headaches, reduced
blood flow to brain
4.0
IDLH - immediate danger to life and
health
3.0
Normal exhalation concentration, ele-
vated breathing and pulse rate
2,0
20,000
1.0
10,000
Possible shortness of breath
0.5
5000
TWA –Maximum for working condi-
tions
0.1 .. 0.2
1000 ..
2000
Recommended maximum value in
public areas
0.04
400
Fresh air
Device is not permitted for the area
Expanded measuring range. The device can be
used conditionally
Area of application of the device with specified
accuracy
The values are guideline values. Depending on the health condition and duration of ex-
posure, problems can also occur below the indicated concentrations under certain cir-
cumstances.

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2.3 Safety instructions
DANGER
Danger of explosion!
Do not use batteries!
This will cause the batteries to heat up during the charging process, causing them to
burst and, in the worst case, explode!
_
CAUTION
Empty or inferior batteries, as well as different states of charge, can lead to leakage
and thus to damage to the device.
Please also observe the information in the chapter 6 "Operation and maintenance".
_
CAUTION
Only use safe USB power supplies to charge the device.
_
CAUTION
The CO2sensor is sensitive to impact! Strong shocks (e.g. from falling down) can lead
to permanently wrong measured values.
Please also refer to chapter 5.1.3 “Measurement stability”.
_
NOTE
This device does not belong in children's hands!
2.4 Intended use
_
The device is designed exclusively for measurements in ambient air and environments
with slightly elevated CO2concentrations in areas that are not harmful to the health. It
is designed to be carried on the body for mobile use.
The user can be warned optically and acoustically of elevated CO2concentrations
based on variable alarm limits. Example applications for this are:
–Use as a monitor for recording of the mean value weighted over 8 hours (TWA)
or 15 minutes (STEL).
–Monitoring of air quality.

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2.5 Qualified personnel
For commissioning, operation and maintenance, the relevant personnel must have ad-
equate knowledge of the measuring process and the significance of the measure-
ments. The instructions in this document must be understood, observed and followed.
In order to avoid any risks arising from interpretation of the measurements in the con-
crete application, the user must have additional expertise. The user is solely liable for
damages/danger resulting from misinterpretation due to inadequate expertise.

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3 The device at a glance
LCD Display
Front view
Sensor openings
Micro USB socket
3.1 Display elements
_
Display
_
Charge status display
Evaluation of the charge status
_
Unit display
Display of units or type of mode, min/max/hold
_
Main display
Measurement of the current CO2value
_
Auxiliary display
Display of the mean value
_
Bar graph
Visualisation of the CO2value
3.2 Connections
Micro USB socket
Charging the batteries

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3.3 Operating elements
On / Off button
Press briefly
Switch on the device
Activate / deactivate lighting
Long press
Switch off the device
Reject changes in a menu
_
Up / Down button
Press briefly
Display of the min/max value
Change value of the selected parameter
Long press
Reset the min/max value of the current measure-
ment
_
Function button
Press briefly
Freeze measurement (Hold)
Call up next parameter
Long press, 2s
Start menu “configuration”, (ONF appears in the dis-
play
Operating status device is in measured value display
device is in a menu

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4 Operation
4.1 Opening the configuration menu
1. Press the Function key for 2 seconds to open the Configuration menu.
2. (ONF appears in the display. Release the Function key.
_
Parameter
Values
Meaning
__INP
Measuring unit
%
CO2measurement in %
PPm
CO2measurement in ppm
_
__AL.
Alarm
OFF
No alarm active
ON
Alarm via text insertion, acoustic signal and flashing
of the background lighting
BEEP
Alarm via text insertion and acoustic signal
L,TE
Alarm via text insertion and flashing of the back-
ground lighting
_AL.1
Pre-Alarm limit (only available if AL <> off)
0.000 .. AL.2
0.. AL2
Alarm limit in % or ppm; a pre-alarm is triggered
when the value is exceeded

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_AL.2
Main-alarm limit (only available if AL <> off)
G 1910-02:
AL.1 .. 1.000
AL.1 .. 10000
Alarm limit in % or ppm, the main alarm is triggered
when the value is exceeded
G 1910-20:
AL.1 .. 3.200
AL.1 .. 19999
Alarm limit in % or ppm, the main alarm is triggered
when the value is exceeded
LCD.2
Mean value
8 H
Time weighted over 8 hours, mean value TWA
STEL
Time weighted over 15 minutes, mean value STEL
OFF
Mean value determination deactivated
POFF
Shut-off time
OFF
No automatic shut-off
0:15, 0:30, 1:00,
4:00, 12:00
Automatic shut-off after a selected time in
hours:minutes, during which no buttons have been
pressed
L,TE
Backlight
OFF
Backlight deactivated
0:15, 0:30, 1:00,
2:00, 4:00
Automatic shut-off of the backlight after a selected
time in minutes:seconds, during which no buttons
have been pressed
ON
No automatic shut off of the backlight
IN,T
Factory settings
NO
Use current configuration
YES
Reset device to factory settings.
After confirming with the function-button, the display
shows: IN,T DONE

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4.2 Call-up of the expanded settings menu
The advanced setting contains the parameters for the adjustment function of the de-
vice.
1. Switch the device off.
2. Hold the down button and press the On/Off button briefly to switch on the device
and open the expanded settings menu.
3. The display shows the first parameter. Release the down button.
Parameter
Values
Meaning
_(AL
Adjustment
OFF
Adjustment function deactivated
2.PT
2-point adjustment
1.PT
1-point adjustment
XARD
Basic sensor adjustment
Only 0 ppm or 0.000 % can be selected as a set-
point value for the adjustment, such as, for example
on nitrogen or 400 ppm or 0.040 % for adjustment
on clean ambient air
_(.SL
Gradient adjustment specification
0.035 .. 1.000
350 .. 10000
Setpoint value in % or in ppm
(at adjustment = 1.Pt oder 2.Pt)
0.000 / 0.400
0/ 400
Setpoint value in % or in ppm
(at adjustment = HArD)

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5 Measurement Basics
5.1 NDIR CO2 sensor
5.1.1 Explanation
_
The sensors are based on non-dispersive infrared sensor technology, NDIR.
This is the most widely used sensor technology for CO2measurement.
The principle of the NDIR sensor is that an IR light source is focusses so that an opti-
cal beam is created, which passes through the existing gas, including CO2. After an
optical band pass filter is passed, an IR sensor measures the level of IR light, wherein
the CO2values in the optical path are displayed.
5.1.2 Charge status display
_
1. Gas inlet
2. Gas outlet
3. IR lamp
4. Optical filter
5. Thermopile detector
A sensor module with single-channel detectors is used for the device.
NOTE
A micro light bulb is used as an IR radiation source. It emits a broadband spectrum.
The sensor is long-lasting and maintenance-free.
5.1.3 Measurement stability
In order to be able to maintain the specified accuracy for many years to come, regular
adjustment must be carried out depending on the required accuracy.
If the device is handled with care, an interval of 1 year is sufficient - however, rough
operating conditions can also shorten this period.
CAUTION
The CO2sensor is sensitive to impact! Strong shocks (e.g. from falling down) can lead
to a permanent detuning of the detector and thus to incorrect measured values (meas-
ured value too low!!).
If this is the case, a "basic sensor calibration" must be carried out (see chapter 6.2.3).

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5.2 Alarms
A two-stage alarm is integrated in the device, which warns by visual and/or acoustic
signal when the respective set limits are exceeded.
–pre-alarm warns when the limit is exceeded, depending on the setting, via text
insertion, flashing of the backlight and/or with a brief tone.
When the pre-alarm is triggered, it can be muted for 5 minutes.
To do this, press any key. The display shows t (LR AL.1.
–main alarm warns when the limit is exceeded, depending on the setting, via text
insertion, rapid flashing of the backlight and/or with a continuous tone
5.3 Special functions
5.3.1 8 hour average value TWA („time-weighted-average”)
If the special function “averaging TWA”was selected in the configuration menu, the
TWA value is displayed alternately with 8 H in the secondary display.
Determination: The display value is calculated from the averaged measurements of
the last 8 hours.
The determination of the measured values starts when the device is switched on, re-
gardless of whether the display of the value in LCD.2 is active.
Resetting the value is only possible by switching off the device.
NOTE
Since there is already at least 400 ppm CO2in the fresh air, the starting value for the
mean value calculation is not 0 but 400.
5.3.2 15 minute average value STEL („short-term exposure limit”)
_
If the special function “averaging STEL” was selected in the configuration menu, the
STEL value is displayed alternately with STEL in the secondary display.
Determination: The display value is calculated from the averaged measurements of
the last 15 minutes.
The determination of the measured values starts when the device is switched on, re-
gardless of whether the display of the value in LCD.2 is active.
Resetting the value is only possible by switching off the device.
NOTE
Since there is already at least 400 ppm CO2in the fresh air, the starting value for the
mean value calculation is not 0 but 400.

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6 Operation and maintenance
6.1 Operating and maintenance notices
_
CAUTION
Damage to the sensor
A sensitive optical sensor is installed in the device. The sensor parameters can change
due to impact or falling. This can result in incorrect measurements.
–Protect the device from impact and falling!
–The measurements must be checked after the device falls or is jarred. If the val-
ues deviate, a basic sensor adjustment must be carried out!
_
NOTE
The device must be handled with care and used in accordance with the technical data.
Do not throw or strike.
_
NOTE
If the device is stored at a temperature above 50 °C, or is not used for an extended pe-
riod of time, the batteries must be removed or recharged regularly. This prevents leaks
from the rechargeable batteries and increases the life of the rechargeable batteries.
6.2 CO2calibration
_
In order to improve the accuracy, the carbon dioxide sensor can be adjusted.
NOTE
Calibration can be carried out in clean ambient air or with test gases (optionally availa-
ble gas extraction device recommended). 1-point calibration at any arbitrary point and
2-point calibration at 0 ppm and an arbitrary point are both possible.
NOTE
Current test gases normally have accuracies of ± 2 %. This tolerance must be taken
into consideration with the measurement uncertainty. The specifications on the analy-
sis certificate must always be observed.
NOTE
For information about the available calibration settings, refer to Configuring parameters
of the configuration menu “expanded settings”.

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To start the calibration, press the Function key for 4 seconds.
For further information, please refer to the following chapter for the adjustment se-
lected in the Expanded settings menu.
After the calibration is finished [AL DONE is displayed.
Then, the current measurement is shown in the display again.
If the calibration is not completed successfully an error message is displayed. [AL ERR.
appears in the display. (See chapter 7 Error and system messages)
Confirm the error message pressing the Function key. The device restarts. The values
of the last correctly performed calibration are restored.
6.2.1 1-point adjustment
Used for optimisation of the accuracy at the adjustment point. The best possible accu-
racy can be achieved even with elevated CO2concentrations
Required material:
–Clean ambient air or test gas (>350 ppm) for gradient correction
–Gas extraction device, if applicable
In order to conduct a CO2adjustment, proceed as follows.
1. Press the Function key for 4 seconds to start the calibration. [ONF appears in the
display first, then [AL.
2. 1-point calibration is started. [.SL appears in the display.
3. The device determines a stable value first. If the measured value is outside of the
value range integrated in the device, the display flashes briefly and an acoustic
signal is issued every 10 s.
4. If the display flashes briefly, an acoustic signal sounds and the bar display blinks,
a stable correct value has been achieved.
5. You can change the value of the gradient compensation with the up key and down
key. Otherwise, confirm the preadjusted value with the function key.
The 1-point calibration is finished.

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6.2.2 2-point adjustment
Used for optimisation of the accuracy for extreme requirements over a wide measuring
range beginning from 0 ppm.
Required material:
–Test gas (>350 ppm) for gradient correction
–Test gas 0 ppm CO2for zero point
–Gas extraction device
In order to conduct a CO2adjustment, proceed as follows.
1. Press the Function key for 4 seconds to start the calibration. [ONF appears in the
display first, then [AL.
2. 2-point calibration is started. [.OF appears in the display.
3. Allow the test gas to flow at about 0.5 l/min at 0 ppm of CO2.
The device deter-mines a stable value first. If the measured value is outside of
the value range integrated in the device, the display flashes briefly and an acous-
tic signal is issued every 10 s.
4. If a stable correct value is reached, the display flashes briefly, an acoustic signal
sounds and the bar indicator blinks.
[.SL appears in the display.
5. Remove the test gas and connect a second test gas to the extraction device. The
device determines a stable value first. If the measured value is outside of the
value range integrated in the device, the display flashes briefly and an acoustic
signal is issued every 10 s.
6. If the display flashes briefly, an acoustic signal sounds and the bar display blinks,
a stable correct value has been achieved.
7. You can change the value of the gradient compensation with the up key and
down key. Otherwise, confirm the preadjusted value with the function key.
8. Remove the extraction device.
The 2-point adjustment is finished

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6.2.3 Basic sensor adjustment
Used to reset the sensor in case of deviations beyond the normally expected devia-
tions. The values of all prior adjustments are reset and cannot be restored. A plausibil-
ity check of the carbon dioxide concentrations does not take place. Depending on the
setting, it can be adjusted either to 0 ppm (e.g. nitrogen) or to 400 ppm of fresh outside
air (or 400 ppm of CO2test gas). Ensure that the setting of the gradient compensation
setpoint [.SL was entered correctly in the “Expanded settings menu”.
If reliable values can no longer be displayed, we recommend performing basic sensor
adjustment of the zero point at 0 ppm CO2with nitrogen and a possibly necessary ad-
ditional gradient compensation via 1-point adjustment.
If incorrect values are displayed after the adjustment, e.g. ERR.2 at 0 ppm CO2, the ad-
justment must be repeated.
Required material:
–Clean ambient air or
–Test gas 0 ppm CO2for basic sensor calibration at 0 ppm
–Gas extraction device, if applicable
In order to conduct a CO2adjustment, proceed as follows.
1. Press the Function key for 4 seconds to start the calibration. [ONF appears in the
display first, then [AL.
2. Basic sensor adjustment is started. KARD appears in the display.
3. Depending on the specification [.SL, let the test gas with 0 ppm CO2flow in at ap-
prox. 0.5 l/min or move the device into clean ambient are with 400 ppm CO2.
The device determines a stable value first. If the displayed measurement is out-
side of the measuring range of the sensor, the device cannot perform stability
recognition. It must be ensured that the carbon dioxide concentration at the sen-
sor is stable before the adjustment is started.
4. If a stable correct value is reached, the display flashes briefly, an acoustic signal
sounds and the bar indicator blinks.
5. Remove the extraction device, if applicable.
The basic sensor adjustment is finished

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6.2.4 Notes on the use of the gas sampling extraction device
For adjustment with reference gas, the sensor openings of the device must be covered
and a connection piece screwed in. We offer corresponding sets for this purpose
- Remove plug
- Place gas orifice on gas inlet holes
- Screw in the Quickconnect adapter
After the adjustment, remove the Quickconnect adapter and the gas orifice and close
the opening with the plug or the screw plug included in the adjustment set.