GREISINGER G 1690 - User Manual

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Summary

About Documentation

Foreword

Introduction to the document and its importance for product operation.

Legal Notices

Information on manufacturer liability, warranty, and document usage restrictions.

Further Information

Details on software version and how to find the product name.

Safety

Safety Symbols Explained

Defines DANGER, CAUTION, and NOTE symbols used in the manual.

Foreseeable Misuse

Details incorrect applications and potential consequences of product misuse.

Safety Instructions

Provides critical safety warnings for handling oxygen and device components.

Intended Use

Specifies the device's exclusive purpose for measuring oxygen concentration and MOD calculation.

Qualified Personnel

Defines requirements for personnel operating and maintaining the device.

Device Overview

G 1690 Series Overview

Visual overview of the G 1690 device, front view, and sensor.

Display Elements

Describes the function of the battery indicator, unit display, main display, and auxiliary display.

Operating Elements

Explains the function of the On/Off, Up/Down, and Function buttons.

Operation

Configuration Menu Access

Instructions on how to access and navigate the device's configuration menu.

Sensor Signal Adjustment

Procedure for calibrating the sensor using ambient air.

Measurement Basics

Oxygen Principles

Explains the relationship between oxygen sensor output and partial pressure.

Oxygen Partial Pressure and Concentration

Defines partial pressure, Dalton's law, and oxygen concentration in air.

Maximum Operational Depth (MOD)

Details the calculation and use of MOD for NITROX diving.

Operation and Maintenance

Operating and Maintenance Notices

General care instructions for the device and sensor to ensure proper function.

Battery Status and Replacement

Information on battery status indicators and replacement.

Changing Battery

Step-by-step instructions for safely replacing the device batteries.

Service and Accessories

Manufacturer Contact

Contact information for GHM Messtechnik GmbH, the manufacturer.

Available Accessories

List of spare parts and further accessories for the G 1690/G 1690T device.

This document serves as a quick reference guide for the GREISINGER G 1690 and G 1690T O2-Analyser / oxygen meter, providing essential information for its safe and effective operation, maintenance, and basic understanding of its measurement principles. Users are strongly advised to read this document carefully and familiarize themselves with the product before use. It should be kept readily accessible for reference. The manufacturer's liability and warranty are voided in cases of misuse, disregard for safety notices, use by inadequately qualified personnel, or unauthorized modifications.

Function Description

The GREISINGER G 1690 and G 1690T devices are designed exclusively for measuring oxygen concentration in gas mixtures and air. The measurement is performed at the sensor opening. The G 1690T model offers an additional feature: it can display the calculated maximum operational depth (MOD) based on the measured oxygen concentration. This MOD function is specifically designed for recreational diving with NITROX mixtures, within a range of 20.9 to 36.0 vol. % O2. It is crucial to understand that this device is not a substitute for necessary calculations and adherence to safety rules for dive planning and execution according to NITROX training. It is not intended for "tech-diving" or other gas mixtures like NITROX50 or TRIMIX, and any such use requires appropriate training and additional safety measures. The device is not suitable for underwater use (rebreather) or as the sole measuring device for controlling submersible gas mixtures. It should not be used in explosion-prone areas or for diagnostic/medical purposes on patients.

Usage Features

The device features a clear LCD display with a main display for the current measured value and an auxiliary display. On the G 1690T, the auxiliary display can show the MOD value with additional unit text (in meters or feet of seawater). The display orientation can be rotated 180° for overhead viewing by pressing the Up/Down buttons simultaneously.

Operating Elements:

On/Off button: A brief press switches the device on or activates/deactivates the backlight. A long press switches the device off or rejects changes in a menu.
Up/Down button: A brief press displays the min/max value (not available on G 1690T) or changes the value of a selected parameter. A long press resets the min/max value (not available on G 1690T).
Function button: A brief press freezes the measurement (Hold), returns to the measurement display, or calls up the next parameter. A long press (2 seconds) opens the configuration menu or closes it, saving any changes.

Configuration Menu: To open the configuration menu, press the Function button for 2 seconds until "Conf" appears. Parameters include:

InP (Auxiliary display): Configures the auxiliary display to show no auxiliary display (only oxygen concentration), MOD in meters, or MOD in feet (G 1690T only).
P.AbS (Air pressure): Allows input of air pressure in hPa (mbar), which is necessary for correct calibration and MOD calculation.
Po2 (Max. Oxygen partial pressure): (G 1690T only) Sets the maximum oxygen partial pressure in bar. It is recommended not to exceed 1.4 bar due to oxygen toxicity, with further reductions (e.g., 1.2 bar) advised under certain conditions (e.g., cold water, stress).
POFF (Shut-off time): Configures automatic shut-off after a selected time (0:15, 0:30, 1:00, 4:00, 12:00) if no buttons are pressed, or disables it ("OFF").
L.tE (Backlight): Configures backlight behavior: deactivated ("OFF"), automatic shut-off after a selected time (0:15, 0:30, 1:00, 2:00, 4:00), or always on ("on").
Int (Factory settings): Allows resetting the device to factory settings ("YES") or using the current configuration ("no").

Calibration: Regular calibration is essential for accurate readings. The device must be calibrated in fresh air (20.95% vol.-% O2). For higher oxygen values, a "bump test" with a known gas concentration (e.g., pure oxygen, NITROX50) is recommended. Before calibration, the current air pressure must be entered in the P.AbS parameter in hPa without a decimal place. After calibration, the device displays a sensor evaluation in 10% steps; if below 30%, the sensor should be replaced. To perform calibration, press the Function button for approximately 5 seconds until "CAL" appears, then release. "CAL Air" will appear, followed by the sensor evaluation.

Maintenance Features

Operating and Maintenance Notices:

The device and sensor must be handled with care and used according to technical data. Avoid throwing or striking.
The sensor opening must be clean and dry to prevent incorrect measurements.
Plugs and sockets must be protected from soiling.
If the device is not used for an extended period, the batteries should be removed to prevent leaks.

Battery: The device uses 2 AA batteries.

Battery indicator: An empty, blinking frame indicates depleted batteries that need replacement, though the device will continue to operate for some time. If "BAT" appears in the main display, the battery voltage is no longer adequate, and the battery is fully depleted.
Changing battery: Only high-quality, suitable alkaline batteries should be used. Damaged or unsuitable batteries can generate heat, causing them to crack or explode. Different types of batteries should not be mixed. Depleted batteries must be removed immediately and disposed of at a suitable collection point. Unnecessary unscrewing of the battery cover should be avoided as it can compromise moisture protection.
1. Unscrew the Phillips screws (A) and remove the cover.
2. Carefully replace the two Mignon AA batteries (B), ensuring correct polarity. Batteries should be inserted without force.
3. Ensure the O-ring (C) is undamaged, clean, and correctly positioned.
4. Fit the cover (D) evenly, ensuring the O-ring remains in place.
5. Tighten the Phillips screws (A).

Disposal: Device components and packaging must be separated for material recycling according to regional statutory regulations and directives. The device should not be disposed of with household waste; it should be returned to the manufacturer for proper and environmentally friendly disposal. Empty batteries should be disposed of at designated collection points.