CABLES AND CONNECTORS FOR CHS SENSORS

Continuous measurement

Probes with a connector (S8, VP6, Memosens,…) and a cable fixed in the terminal board of the converter are standard.

S8*

• two-pole basic connector
• can transmit only one signal, so it is suitable where a temperature sensor is not needed or it is located outside the pH probe
• for humid environment can be used with a suitable armature, for example CHS WaterDip

• cable:
  • diameter 3 mm, weak shielding - prone to electromagnetic interference
  • recommended length up to 5 meters
  • installation: away from sources of interference (power cables, electric motors, transformers)
  • prone to stray currents on metal constructions

VP6

• VarioPin connector with 6 pins can transmit multiple signals. Suitable for probes with integrated temperature sensor
• robust metal construction and good water resistance
• use in almost all environments and applications
• cable:
  • double shielding, less prone to electromagnetic interference
  • recommended length up to 20 meters

installation: away from sources of interference (power cables, electric motors, transformers)

Memosens

• inductive connector
• signal transmission does not provide by contact of metal components, but by induction between the coils in the probe and the cable
• resistant to almost any environment, it does not mind moisture or corrosive substances
• the digital signal is resistant to any interference
• suitable for any application, especially in humid and corrosive environments
• cable:
  • the digital signal is not prone to interference
  • recommended length up to 20 meters
  • installation: also possible in cable ways with power conductors

Probes with a fixed cable are used rather seldom in case of simpler measuring systems. Usually for little sophisticated converters, where the signal cable is connected to an external (usually BNC) connector. This is a source of problems due to environmental corrosion of the connector.

Picture of sensor´s connectors:

connector S8	connector VP6	connector Memosens

Laboratory and portable measurements

Probe with connector (usually S7*)

• used as an economical variant where an external temperature sensor is placed or temperature measurement is not required
• two-pin S7 connector can only transmit one signal
• recommended as laboratory solution
• in case of interference is recommended to use a braided cable (5 mm)

Fixed cable

• is required in case of integrated temperature sensor
• suitable for portable measurements
• the absence of a connector is good for humid environments
• if the entire probe is accidentally immersed in the sample, a risk of leakage is not as high as in case of connector
• there is no risk of probe´s breakage when connector is released

Connectors on the instrument side which are usually used for pH measurement:

Connectors such as Cinch, Jack, "banana" and others are commonly used to transmit the temperature sensor signal. Usually two-pole versions, or two separate bananas. In the case of only one pole, the (-) pole of the temperature measurement is common to the reference of the pH probe. It depends on the manufacturer of the pH meter.

Note:

* S7/S8 cable part of connector is identical, the difference is in the head of probe

– S7: laboratory version

– S8: process type with thread (PG 13.5) for pipe mounting.

connector BNC	connector DIN