Ion Selective Electrodes

Radnoti is proud to offer the Micro Electrodes Inc. manufactured electrodes. Specifically designed for use with Radnoti systems these electrodes feature a minimized overall length so as to reduce the risk of breakage when incorporated into the bench top systems. As many of the system components may need to be handled at one time or another, the electrodes maintain a minimum external exposure to avoid inadvertently breaking the electrodes when servicing the systems. The compact design still incorporates all of the desired features and benefits of the original Micro Electrodes designs.

pH microelectrode

#MI-410 Micro-combination pH microelectrode
Measures volumes as small as 5 micro liters. Each combination pH electrode includes a bottle of reference solution.
SPECIFICATIONS:

Total length: 15cm
Lead Length: 1m
Body (outer diameter): 6 mm
Tip (outer diameter) pH:  1.2 mm
Ref + pH: 2.5 mm
Response time:  5 to 15 seconds
Depth of immersion:  1.5 to 2 mm
Sensitivity: pH 0 to 14
Temperature range:  -5o to 100o C
Reference electrode type: Solution and electrode 3M KCl and Ag-AgCl

K+ Ion microelectrode

#MI-442 K+ Ion microelectrode
This miniature electrode has many applications in general purpose analysis and in micro chemical studies. It requires the use of an external reference electrode such as the MI-409 Micro-Reference Electrode. Also available in Flow-thru configuration, similar to 8-705, 16-705.
SPECIFICATIONS:
Total length: 14.6 cm
Lead length: 1 m
Body (outer diameter): Stainless 3.2 mm
Tip (outer diameter): PVC 2.4 mm
Sensitivity: 10o to 10-5 M K+
Temperature range: 0oC to 50oC
Response time: 5 to 15 seconds
Depth of immersion: 0.1 mm
Selectivity: K+ / Na+ = 1000
K+ / (NH4)+ = 100

Ca++ Ion microelectrode

#MI-600 Ca++ Ion microelectrode
This miniature electrode has many applications in general purpose analysis and in micro chemical studies. It requires the use of an external reference electrode such as the MI-409 Micro-Reference Electrode. Also available in Flow-thru configuration, similar to 8-705, 16-705.
SPECIFICATIONS:
Total length: 14.6 cm
Lead length: 1 m
Body (outer diameter): 3.2 mm
Tip (outer diameter): 2.4 mm
Sensitivity: 10o to 10-6 M Ca++
Temperature range: 0oC to 50oC
Response time: 5 to 15 seconds
Depth of immersion: 0.1 mm
Selectivity: Ca++ / Mg++ = 20000
Ca++ / Na+ = 10000
Ca++ / K+ = 10000

O2 microelectrode

#MI-730 Dip-type O2 microelectrode
The MI-730 Micro-Oxygen electrode features negligible oxygen consumption, fast response and requires less than a drop. Each electrode is supplied with 6 assembled membranes and a bottle of electrolyte solution.
SPECIFICATIONS:
Total length 8.6 cm
Lead length: 2 m
Body (outer diameter): 3 mm
Tip (outer diameter): 3 mm
Response range: 0 to 100%
Response time: less than 20 seconds
Depth of immersion: 0.1 mm
Reference: electrode type Ag
Sensitivity: 1700 pA in air at 25oC
O2 consumption in air at 25oC: 2.5 x 10-4 ul/hr

Na+ Ion microelectrode

#MI-420 Na+ Ion microelectrode
This miniature electrode has many applications in general purpose analysis and in micro chemical studies. It requires the use of an external reference electrode such as our MI-409 Micro-reference electrode. Also available in Flow-thru configuration, similar to the 8-705 and 16-705.
SPECIFICATIONS:
Total length: 14.6 cm
Lead length: 1 m
Body (outer diameter): 2 mm
Tip (outer diameter): 1.5 mm
Sensitivity: 10o to 10-5 Na+ M
Temperature range: -5oC to 100oC
Response time: 5 to 15 seconds
Depth of immersion: 1.0 mm
Selectivity: Na+ // K+ = 1000
Ag+ / K+ = 1.5 x 106
Ag + / Li+ = 250
Na+ / (NH4)+ = 3000

#MI-425 Na+ Ion microelectrode
Each combination sodium probe includes a bottle of reference solution. This microelectrode is also available in a slender configuration.
SPECIFICATIONS:
Total length: 15 cm
Lead length: 1 m
Body (outer diameter): 6 mm
Tip (outer diameter): Na+ 1.5mm
Na+ + Ref: 3.2mm
Response time: 5 to 15 seconds
Depth of immersion: 1.5 mm
Sensitivity: Saturated to 10-6M Na+
Temperature range: -5o to 100oC
Reference electrode type: Solution and electrode 1M KCl and Ag-AgCl
Selectivity Na+/ K= 1000
Na+/(NH4)+= 3000
Ag+/K+= 1.5 x 106
Ag+/Li+= 250

NH3, (NH4)+ microelectrode

#MI-740 Dip-type NH3, (NH4)+ microelectrode
The MI-740 Micro-Ammonia electrode features fast response and requires less than a drop.
Each electrode is supplied with 6 assembled membranes, a bottle of electrolyte solution and a bottle of NaOH (ammonia free).
Accessories: MI-740A Replacement Membrane Housing Kit: Kit includes 6 membranes, 1 bottle of electrolyte solution and 1 bottle of NaOH (ammonia free).
SPECIFICATIONS:
Total length 8.6 cm
Lead length: 2 m
Body (outer diameter): 6 mm
Tip (outer diameter): 3 mm
Concentration range: 1 to 10-6 M )17000 to 0.02 ppm)
Sensitivity: 53 mv/decade
Interference: volatile amines
Response time: 2 to 3 min
Depth of immersion: 0.1 mm
Reference electrode type: Ag-AgCl

#MI8-740 and #MI16-740 Flow-thru NH3,(NH4)+ microelectrodes (For 1/8″ % 1/16″ I.D. Tubing)
These miniature electrodes are ideal for monitoring ammonia in a continuous flow such as water, blood, urine, physiological fluids, etc. They feature fast response and require less than a drop. Each microelectrode is supplied with 6 assembled membranes, a bottle of electrolyte solution and a bottle of NaOH (ammonia free).
Accessories: 8-740A & 16-740A Housing Kits: Kit includes 6 T-membranes, a bottle of electrolyte solution and a bottle of NaOH (ammonia free).
SPECIFICATIONS:
Total length: 8.6 cm
Lead length: 2 m
Diameter membrane barrel: 3 mm
Material of barrel: acrylic
Material of flow cell: polysulfone
Cell volume (T-fittings): 0.093 ml & 0.011 ml
Sensitivity: 53 mv/decade
Response time: 2 to 3 min
Response range: 1 to 10-6 M (17000 to 0.02 ppm)
“T” fittings: (size) 1/8″ & 1/16″
Interference: volatile amines

CO2 microelectrode

#MI-720 Dip-type CO2 microelectrode
This miniature electrode for carbon dioxide features fast response and requires less than a drop. Each microelectrode is supplied with 6 assembled membranes and a bottle of electrolyte solution.
Accessories: MI-720A Replacement Membrane Housing Kit: Kit includes 6 membranes and 1 bottle of electrolyte solution.
SPECIFICATIONS:
Total length: 8.6 cm
Lead length: 2 m
Body (outer diameter): 6 mm
Tip (outer diameter): 3 mm
Concentration range: 10-2 to 10-4M (440 to 4.4 ppm)
Sensitivity: 0.4 mv/mm CO2
Interference: weak volatile acids
Response time: less than 1 min
Depth of immersion: 0.1 mm
Reference electrode: type Ag-AgCl

Conductivity microelectrodes

#MI-915 and MI-905 Dip-type Conductivity microelectrodes
SPECIFICATIONS (MI-915 MI-005)
Total length: 14.6 cm 14.6 cm
Lead length: 1 m 1m
Body (outer diameter): 3.2 mm 2.4 mm
Cell constant (approx): 1 1
Depth of immersion: 5 mm 5 mm
Material of flow cell: ABS ABS

Millivolt Adapter

#MV-ADPT Millivolt Adapter
For use with any Microelectrodes,Inc. pH/Ion Electrodes. Please specify connector needed for interconnecting cable to adapter, when ordering. We will provide the patch cord between the adapter and your measuring device. Please specify this also when ordering.
This adapter allows a pH/Ion Electrode to be directly connected to a voltage reading device (i.e. Strip Chart, A/D Board, DVM) without the need of a pH/Ion Meter. You will need to do Nernst equations manually or with a computer.
SPECIFICATIONS:
Size: 28.5 mm x 22.4 mm x 58 mm
Power requirements: 1 lithium CR2032 3V battery
Battery life: 5 years
Weight: 70 grams
Output: 1mV/mV Input
Connectors: LEMO 00.250

Oxygen Electrode Adapter

#O2-ADPT Oxygen Adapter
For use with any Microelectrodes,Inc. Oxygen Electrodes. Please specify connector needed for interconnecting cable to adapter when ordering. We will provide the patch cord between the adapter and your measuring device. Please specify when ordering.
This adapter allows an Oxygen Electrode to be directly connected to a voltage reading device (i.e. Strip Chart, A/D Board, DVM) without the need of an Oxygen Meter. You will need to calibrate manually or use a computer.
SPECIFICATIONS:
Size: 28.5 mm x 22.4 mm x 58 mm
Power requirements: 2 lithium CR2032 3V batteries
Battery life: 2 years
Weight: 70 grams
Output: 1mV/5 pA Input
Connectors: LEMO 00.250

Catalog# Description Pkg. Store
MI410 Combination pH 1 Request Quote
MV-ADPT pH instrumentation 1 Request Quote
O2-ADPT Oxygen Instrumentation 1 Request Quote
MI-442 K+ Ions 1 Request Quote
MI-600 Ca++ Ions 1 Request Quote
MI-730 Oxygen 1 Request Quote
MI-420, 425 Na+ Ions 1 Request Quote
MI-740, MI8-740, MI16-740 NH3, (NH4)+ Ions 1 Request Quote
MI-720 Dip Type CO2 Ions 1 Request Quote
MI-915, 905 Dip Type Conductivity 1 Request Quote