Required materials - OPT100

OPT100 Installation Guide

Document code
Document type
User guide

Items delivered by Vaisala

In addition to the items delivered by Vaisala, installation of the DGA monitor requires various materials that you must supply yourself.

  • DGA Monitor (Vaisala item OPT100)

    • DGA Monitor cabinet
    • Swagelok® plugs for oil connector fittings (2 pcs, Swagelok part no. SS-10M0-P (316 Stainless Steel Plug for 10‑mm Swagelok Tube Fitting))
    • Protection shell for RJ45 Ethernet connector
    • Relay control cable (marked RELAY, Vaisala item CBL210539)
    • Cabinet key
    • Transformer valve tag (2 pcs)
    • Auxiliary device power cable, red (Vaisala item CBL211210)
    • Auxiliary device power cable, black (Vaisala item CBL211211)
    • Auxiliary device power cable, ground (Vaisala item CBL211260)
    • Allen keys (2 pcs, 5‑mm and 6‑mm)
  • Power Supply Unit (Vaisala item OPTPSU1 or OPTPSU2)

    • Power Supply Unit cabinet
    • Instrument power cable (Vaisala item CBL210544)
    • Cabinet key

Optional items (must have either Wall Mounting Set or Ground Mounting Set):

  • Wall Mounting Set (Vaisala item OPTMSET1)

    • Installation beam (2 pcs)
    • Cradle for Power Supply Unit
    • Screws and washers
  • Ground Mounting Set (Vaisala item OPTMSET2)

    • Mounting stand (delivered in three parts)
    • Wedge anchors (6 pcs) for securing the mounting stand to ground
    • Screws, washers, and nuts
  • Weather Shield (Vaisala item OPTSHLD1)

    • Weather shield (delivered in three parts)
    • Screws and washers
  • Tubing adapter, 10‑mm to 3/8" (2 pcs, Vaisala item ASM213275SP)
  • Tubing adapter, 10‑mm to 1/4" (2 pcs, Vaisala item ASM213274SP)

DGA monitor installation and commissioning

Not supplied by Vaisala.

  • Grounding cable with 4 … 16‑mm2 (12 … 5 AWG) conductor. Enough to reach from the DGA monitor and the power supply unit to the grounding point(s).
  • Mains power cable with 2.5‑mm2 (14 AWG) conductor and 9 ... 16‑mm (0.35 … 0.63 in) external diameter. Must be compliant with local regulations for mains power cables.
  • Relay cable with 0.14 … 4‑mm2 (26 … 12 AWG) conductors and 7 … 12‑mm (0.28 ... 0.47 in) external diameter for connecting external devices to the relays. Verify that the required current carrying capacity matches the specification of the cable.
  • RS-485 cable
  • Shielded outdoor Ethernet cable with a RJ45 connector for the permanent Ethernet connection
  • Laptop computer with:
    • RJ45 Ethernet connector
    • Web browser (Google Chrome, Microsoft Edge, or Mozilla Firefox)
  • Ethernet cable with RJ45 connectors for temporary use

Oil pipe construction

Not supplied by Vaisala.

The amount of required oil pipe construction materials depends on the intended pipe length. Two pipes are needed, one for intake and one for returning the oil. Using the recommended pipe material, the maximum allowed length of a single pipe is 10 m (33 ft).

Table 1. Pipe options
Specification Mineral oil devices (recommended) Mineral oil devices (minimum) Synthetic ester devices
Max. pipe length 10 m (33 ft) 5 m (16 ft) 10 m (33 ft)
Inner diameter 7 … 8 mm (0.28 … 0.31 in) 4 … 7 mm (0.157 … 0.28 in) 8 mm (0.31 in)
Outer diameter 10 mm 6 mm 10 mm
Wall thickness 1 … 1.5 mm (0.039 … 0.059 in) 1 … 1.5 mm (0.039 … 0.059 in) 1 mm (0.039 in)
Available adapters (outer diameter) 3/8" 1/4" 3/8"
  • Recommended oil pipe material: stainless steel tubing with 10‑mm (0.39‑in) outer diameter. Reserve enough pipe material to connect the oil intake and return valves to the DGA monitor.
  • Adapters for connecting the oil pipes to the valves on the transformer
  • Adapters for connecting the oil pipes to the DGA monitor, if not using the recommended tubing size (10‑mm (0.39‑in) outer diameter). Optional accessories for connecting 3/8" and 1/4" outer diameter tubing are available from Vaisala.

  • Pipe fittings for joining pipe sections
  • T-connector (optional)
  • Pipe supports
  • Oil pipe insulation, for example ArmaFlex tubing (min. 20-mm (0.787 in) wall thickness) (recommended in cold climates, especially for devices using synthetic ester liquid)
  • Trace heating, self-regulating, 10 W/m (recommended in cold climates, especially for devices using synthetic ester liquid)
  • Oil absorption material for controlling possible leaks
  • Rags for wiping off oil

Mounting using Wall Mounting Set

Not supplied by Vaisala.

  • M8 anchors or bolts (suitable for wall material)


Not supplied by Vaisala.

  • Personal safety equipment as required by installation site and applicable legislation