Equipment Preparation

Ancillary Requirements

Mounting Options

Correct mounting of the OTS is of paramount importance to measurement performance. Osprey Measurement Systems offer a range of mounting options to accommodate various applications; however it is the installer's responsibility to ensure the mounting option selected is appropriate for the task.

Considerations

When selecting a mounting option, consider the following:

• Material of the monitored structure

• Duration of monitoring

• Anticipated movement under observation

• Exposure to change or stress during installation

• Sources of movement or stress during the monitoring period

• Impact of mounting method on the monitored structure

• Sources of vibration and their impact on measurement performance

Data Logger

The OTS operates on commands sent and received over an RS-485 serial bus. It has both an ASCII command set, and a ModBUS RTU interface.

To interact with the OTS, a data logger must be:

1. Pre-configured to be compatible with Osprey Measurement Systems' OTS

   OR

2. Configurable such that the commands can be user defined

   AND

3. Able to provide sufficient power and voltage to power the required number of sensors

The OTS can be configured and monitored using a laptop, field PC or mobile device using a USB serial port interface.

Power Requirements

The OTS will function between 5 to 18V. An OTS that has been exposed to non-transitory voltages above 24V should be removed from service.

Power Consumption at 12V

OTS Equipment

An OTS system comprises of one or more OTS sensors. Prior to mobilising the sensors to site, it is recommended users perform the checks detailed below.

Initial Checks

While Osprey Measurement Systems' instruments undergo rigorous testing prior to dispatch, it is best practice to test all devices on receipt and prior to mobilising to site to confirm no damage during shipment and to verify performance.

Physical Check

• Check for any signs of damage to the packaging that may lead to damage to the equipment inside

• Check the cables for any nicks, abrasions, crushing or kinking

• Check the sensors for any dents or abrasions

• Check the rubber seals on the sensors

Function Check

• Link each string to your preferred data logger or the Serial USB Terminal app. Carry out a read cycle and confirm all sensors are reporting correctly

• Adjust the position of the sensors. Repeat the read cycle and confirm that the value has changed

Cabling

The cable flylead allows connection of the bus into a logger or RS485 interface.

Wiring Color Codes

Jumper cables

Fixing Systems

The OTS is a highly precise instrument. The manner in which it is secured to the measured structure is a significant vector for measurement contamination and should be considered carefully.

Direct Fixing

The OTS has two mounting holes, each designed for an M4 Low Cap Screw (DIN 7984) for fixing the OTS to the mounting fixtures detailed below.

Magnetic Fixing

Where the OTS is to be fitted to ferrous or other magnetically connectable substrates, high performance threaded magnets can be used.

Mounting Bracket – Adhesive Fixing

The Glue Plate – Mini is a stainless steel plate designed to offer optimal bonding using industrial adhesives for fixing the OTS to steel or concrete.

Mounting Bracket – Mechanical Fixing

The mounting bracket allows secure fixing of the OTS to any target material using a variety of methods:

• Adhesives

• Screws

• Masonry anchors

• Ground pegs

• Welding

• Clamps

Rail Clip

The OTS is designed to be mountable to the foot of standard BS113 rail via a hammer on clip fastening assembly. The fastening assembly consists of a spring clip, and a threaded wedge piece. This wedge piece provides direct mechanical coupling between rail and OTS node and also provides threaded holes that allow rapid removal and replacement of OTS's during track renewal works.

Strapping

The OTS has two banding recesses for use with up to 6mm width steel or polymer restraining ties. These can be used to fix the OTS to rebar or access casing ahead of embedding in poured concrete or grouts.

Restraint tie examples include:

• Hellerman Tyton Z80L-HSW

• Hellerman Tyton MBT14S.M3P