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Variopin (VP) electrical connectors are unique to process sensors. Their design is well suited for sensor applications since VP connectors have no recessed areas where moisture can collect. They also maintain a robust IP68 rating and withstand repeated autoclave cycles. Hamilton makes three varieties of open-end VP cables. Each cable design is described below along with its intended purpose and sensor products.

VP6 Open End Cables

These cables are recommended for use with traditional (non-Arc) products such as pH / ORP, polarographic DO, and 2 / 4 pole Conducell conductivity sensors. These products have analog (mV, nA) output signals. The measurement signal is carried on a single coaxial cable. VP6 cables use a slightly heavier outer insulation jacket that can be desirable in rough environments

Sensors with VP6 connections will have 6 gold contact pins as shown in the picture to the left. The measurement pins are always A & B on either side of the keyed notch. Matching cable product numbers are listed below.

(355108 / 355109 / 355110 / 355111 / 355112)

Wire Color & DescriptionVP PinpH/RedoxOxyFerm VP / OxyGoldConducell UPWConducell 4UxF
Black transparent coax core A pH/Redox Cathode Inner Electrode High Potential
Red wire B Reference Anode Inner Electrode High Current
Grey wire C - - Outer Electrode Low Potential
Blue wire D Liquid Earth Ground Outer Electrode Low Current
White wire E Pt 100 / Pt 1000 NTC 22 kOhm Pt 1000 Pt 1000
Green wire F Pt 100 / Pt 1000 NTC 22 kOhm Pt 1000 Pt 1000
Green/yellow wire Housing Shield Shield Shield Shield

VP8 Open End Cables

VP8 cables are designed for use with the VisiFerm ECS Optical DO sensors. The cable uses a double coaxial design to provide additional shielding of the measurement signal from the power wires needed for the optical measurement. Due to this shielding, the VP8 cables are also popular with pH / ORP as well as polarographic DO measurements in electrically noisy environments.

Pin connections on VP8 sensors follow the same pattern as VP6 but have the additional two contact pins needed to carry power for the sensor. Matching cable product numbers are listed below.

(355217 / 355218 / 355219 / 355220 / 355221 / 355222)

Wire Color & DescriptionVP PinVisiFerm ECS (ECS mode)VisiFerm ECS (mA mode)Oxyferm VP / OxyGoldpH / Redox
Black transparent coax core A Cathode (ECS Mode) - Cathode pH/Redox
Black coax shield B Anode (ECS Mode) - 4 to 20mA Anode Reference
Red transparent coax core C Power: +24VDC Power: +24VDC Guard -
Red coax shield D Power: Ground Power: Ground Ground Liquid Earth
White wire E NTC 22 kOhm - NTC 22 kOhm Pt 100 / Pt 1000
Green wire F NTC 22 kOhm - NTC 22 kOhm Pt 100 / Pt 1000
Yellow wire G RS485 (A) - - -
Brown wire H RS485 (B) - - -
Green/yellow wire Housing Shaft - Shield Shield

VP8 Data Cables

Data cables are easily distinguished by their reddish orange insulation. These cables were specifically designed for use with Hamilton Arc sensors which output Modbus digital protocol and 4 - 20 mA output signals. Data cables use individual wires (no coaxial cable) thus should not be used with traditional analog sensors.

Arc sensors only use the VP8 style connector head shown to the left. Matching cable product numbers are listed below.

(355263 / 355264 / 355265 / 355266 / 355267)

Wire Color & DescriptionVP Pin

pH/ORP, OxyFerm, Conducell Arc

VisiFerm ArcIncyte Arc
yellow wire A 4 to 20mA interface #2 - -
Green wire B 4 to 20mA interface #1 4 to 20mA interface #1 -
Red wire C Power: +24VDC Power: +24VDC Power: +24VDC
Blue wire D Power: Ground Power: Ground Power: Ground
Brown wire E - -
White wire F - -
Grey wire G RS485 (A) RS485 (A) RS485 (A)
Pink wire H RS485 (B) RS485 (B) RS485 (B)
Green/yellow wire Housing Shield Shield Shield