Delta OHM HD2109.1 Operating Manual

thermometers HD2109.1 – HD2109.2 www.deltaohm.com Companies / Brands of GHM English Keep for future reference. ...

V2.4 CONTENTS INTRODUCTION ..................................................................................................................................................... 3 KEYBOARD AND MENU DESCRIPTION ............................................................................................................ 8 MEASUREMENT OF THE DISSOLVED OXYGEN ....................................................................................... ...

V2.4 INTRODUCTION The HD2109.1 and HD2109.2 are portable instruments with a large LCD display. They measure the concentration of dissolved oxygen in liquids (in mg/l), the saturation index (in %) and the tem- perature using SICRAM combined probes of polarographic, with two or three electrodes, and galvanic type with integrated temperature sensor. Temperature only is measured by Pt100 - SICRAM or direct 4 wires - immersion, penetration or ...

V2.4 HD2109.1 1. 8-pole DIN45326 connector, input for dissolved oxygen and temperature combined probes, for Pt100 SICRAM temperature probes and direct 4-wire Pt100 probes complete with TP47 module. 2. External auxiliary power supply connector input (positive at centre). 3. Battery symbol: displays the battery charge level. 4. Function indicators. 5. Secondary display line. 6. CAL/ key: during normal operation starts the dissolved oxygen p ...

V2.4 HD2109.2 1. 8-pole DIN45326 connector, input for dissolved oxygen and temperature combined probes, for Pt100 SICRAM temperature probes and direct 4-wire Pt100 probes complete with TP47 module. 2. External auxiliary power supply connector input (positive at centre). 3. Battery symbol: displays the battery charge level. 4. Function indicators. 5. Secondary display line. 6. CAL/ key: during normal operation starts the dissolved oxygen p ...

V2.4 KEYBOARD AND MENU DESCRIPTION Foreword The instrument keyboard is composed of single-function keys, like the MENU key, and double- function keys such as the ON-OFF/Auto-OFF key. In the double-keys, the function in the upper part is the "main function", while the one in the bottom part is the "secondary function". When the instrument is in standard measurement mode, the main function is active. In the menu or in conjunction with the FU ...

V2.4 The automatic turning off function is disabled when external power is used. On the other hand, it cannot be disabled when the batteries are discharged. FUNC/ENTER key During normal measurement this enables the display and logging of the maximum (MAX), mini- mum (MIN) and average (AVG) value of dissolved oxygen concentration, saturation index, baro- metric pressure and temperature measurements, updating them with the acquisition of new ...

V2.4 The instrument has an Auto-Hold function, which can be set in the MENU, that "freezes" the meas- urement automatically when it has been stable (within 1 digit) for over 10 seconds: the message HOLD is displayed. To perform a new measurement, it is necessary to press the FUNC/ENTER key. The HOLD message starts blinking, while the display follows the actual measurement trend, until it stabilizes again and the HOLD message remains still ...

V2.4 Hold function is enabled, the instrument performs the measurement and when it stabilizes it goes in HOLD mode. To update the display indication, press FUNC/ENTER. In the following figure you can see an example of the measurement process with the Auto- Hold function enabled. A probe is immersed into a liquid at concentration C1 and, to per- form the measurement, the FUNC/ENTER key is pressed: The concentration measurement raises progr ...

V2.4 ond intervals even if the interval is set to 0. With an interval from 1 to 3600s, continuous data transfer is started when the SERIAL key is pressed. To end the recording (LOG) and continuous data transfer operations (SERIAL with an interval greater than 0), press the same key again. 7) RCD MODE (Record mode): the instrument captures the dissolved oxygen concentration, saturation index, barometric pressure and temperature values ever ...

V2.4 When the logging function is on, the LOG indication is displayed, the battery symbol blinks and a beep is issued each time a logging occurs; the battery symbol does not appear when using an external power supply. To end the logging, press LOG. If the Auto-HOLD function is enabled (please see the menu), the data logging is disabled. The HD2109.2 can turn off during logging between one capture and the next: the function is con- trolled ...

V2.4 MEASUREMENT OF THE DISSOLVED OXYGEN The instruments work with combined probes of polarographic, with two or three electrodes, and galvanic type with integrated temperature sensor, or with temperature probes with Pt100 sensor. The dissolved oxygen probe is fitted with SICRAM module; the temperature probe can be a SICRAM type or direct 4 wires. The probe measures the dissolved oxygen partial pressure in the measured liquid, as well as ...

V2.4 Measurement of the concentration of dissolved oxygen The probe must be calibrated periodically using the DO9709/20 (for polarographic probes DO9709SS, DO9709SM and galvanic probe DO9709SG) or DO9709/21 (for galvanic probe DO9709SS.1) calibrator. The instrument checks the dissolved oxygen probe efficiency; the "CHNG MEMBRANE AND ELECTROLYTE" message indicates that the probe is exhausted. The same message is displayed during calibratio ...

V2.4 DO9709SM POLAROGRAPHIC PROBE 1. Remove the protective container from the head of the probe. 2. Unscrew the probe's head with the membrane permeable to oxygen. 3. If necessary, replace the membrane. 4. Fill the head of the probe with the supplied electrolyte solution. 5. Eliminate any possible air bubble in the electrolyte solution. 6. Screw the probe's head back on carefully. DO9709SG GALVANIC PROBE 1. Remove the protective container ...

V2.4 8. Wait approximately 2 hours before using the probe, then calibrate. ATTENTION: The electrolyte solution contains Potassium Hydroxide (KOH) and is caustic! Avoid contact with skin, use suitable gloves and protect the eyes. In case of contact, rinse immediately and thouroughly with water. Note: some residues (lead oxide and carbonate) due to the reaction of the electrolyte solution with oxygen can be visible inside the membrane; such ...

V2.4 5. Screw the probe's head back on carefully. Check the probe's status The glass body covering the cathode of the polarographic probe and the membrane on the probe's head should not be damaged. If there are cracks in the glass body, the probe must be replaced. If the oxygen-permeable mem- brane is damaged, dirty or obstructed it must be replaced. When the probe's head is unscrewed the probe is not protected. Handle it with care to avo ...

V2.4 Polarographic probe and galvanic probe: differences To help choosing between the use of a polarographic or galvanic probe, the following table summa- rizes the main differences between the two probes. Polarographic probe DO9709SM Galvanic probe DO9709SG Polarization time After connecting the probe to the in- strument it is necessary to wait at least 5 minutes before taking the measurement. Polarization is not needed. After con- necti ...

V2.4 Pt100 TEMPERATURE PROBE The instrument accepts the input of Platinum temperature probes with resistances of 100Ω with SICRAM module or direct 4 wires. The excitation current was chosen in order to minimize the sensor self-heating effects. The probes with direct 4-wire input are checked for conformity with class A tolerance accord- ing to norm IEC751 - BS1904 - DIN43760. The °C or °F unit of measurement can be chosen for display, ...