Envco – Environmental Equipment

ISEs typically utilize one of 4 primary sensor types:
Polymer Membrane – This common sensor design incorporates ionophores or other ionexchange agents that are specific to the ion of interest, into an inert matrix such as PVC. A mill volt potential develops at the surface of the membrane and is correlated to the ion concentration. This sensor type is accurate but less durable than some others. Sensors of this type include: Ca2+, BF4- , NO3 - , K+, and Surfactant.

Solid State – These sensors utilize relatively insoluble inorganic salts within a hard pellet or crystalline matrix that allows the detection of specific ion activity. These sensors are both accurate and one of the longest lasting ISE sensor types. They may need to be buffed on occasion to restore performance. Sensors of this type include: Br- , Cd2+, Cl- , CN- , F- , I- , Pb2+, S2 - , Ag2+, and SCN

Gas Sensing – With a gas permeable membrane, an internal buffer solution, and the use of ionic strength adjustors, these sensors are an accurate method to detect ions like NH4+, CO2, NOx and others.

Glass Membrane – Like a pH sensor, these ISEs use a special glass formula to be selective for a specific ion. Na+ is a common parameter for this type of ISE.

Our ISEs (with exception) with the proper Reference Filling Solution, Ionic Strength Adjustor, Calibration Solution, and an Instruction Sheet so the analyst has everything they need to begin their measurements.

To address the design requirements of ion-selective sensor, as well as the needs of analysts, ASI has 5 primary types of combination ISEs:
12 Series – With its refillable double junction reference system, a ceramic pin junction and replaceable sensing modules, this very versatile ISE model offers many of the best features to ensure a long life and affordability.
Specifications
Sensor Replaceable
Reference Refillable, ceramic pin
Construction PVC/ABS
Parameters NH4 + , Br - , Cd2 + ,Ca2 + , Cl - , Cu2 + ,CN- , F- , BF4 - , I - ,Pb2 + , NO3 - , NO2 -, K+ , Ag+ , S2 - , Surfactant ,SCN

03 Series – A refillable sleeve type reference junction captures a film of electrolyte for a very effective liquid-liquid interface. A quick press of the electrode cap replenishes the junction before contaminants can attack the reference wire. A fixed sensor and refillable double junction reference make this a very good ISE for dirty samples.
Specifications
Sensor Fixed
Reference Refillable,sleeve- type
Construction Epoxy
Parameters Br- ,Cd2 + , Cl - ,Cu2 + , CN- , F- ,I - , Pb2 + , Ag+ ,S2 - , SCN

43 Series – This affordable ISE has a sealed, double-junction reference with a fiber junction. For general purpose measurements it will provide accurate measurements for an extended period.
Specifications
Sensor Fixed
Reference Sealed, Fiber
Construction PVC, Epoxy
Parameters NH4+, Br - , Cd2 +,Ca2 + , Cl - , Cu2 + ,CN- , F- , BF4 - , I - ,Pb2 + , NO3 - ,NO2 - , K+ , Ag+ ,S2 - , Na+ ,Surfactant ,SCN

44 Series - This affordable ISE has a refillable, double-junction reference with a porous Teflon junction. For general purpose measurements it will provide accurate measurements and the versatility of different reference filling solutions.
Specifications
Sensor Fixed
Reference Refillable, ceramic pin
Construction PVC, Epoxy
Parameters NH4+ , Br - , Cd2 + ,Ca2 + , Cl - , Cu2 + ,CN- , F- , BF4 - , I - ,Pb2 + , NO3 - ,NO2 - , K+ , Ag+ ,S2 - , Na+ ,Surfactant ,SCN

Ordering Information
CU12-0001 Copper (Cu2 + ) Series 12
CU03-0001 Copper (Cu2 + ) Series 3
CU43-0001 Copper (Cu2 + ) Series 43
CU44-0001 Copper (Cu2 + ) Series 44