Mechanical Installation Of 765/766/768/365 Vito Water (And Temp.) Probe - Honeywell Enraf VITO 762 Installation Manual

 Slowly feed the temperature probe into the tank; be careful not to damage the
corrugated stainless steel tube when lowering the probe into the tank by making
sure it does not rub over the tank nozzle;
 As soon as the probe's end touches the tank bottom, adjust the flange (2) to the
correct position on the adjusting pipe (1);
Note:
Use a suitable pipe sealant on adjusting pipe for sealing threaded part of the
flange;
 Secure the flange on the roof nozzle and make a ground connection across the
flanges;
 Lock the VITO probe by means of the lock washer (3) and nut (4);
 Place the instrument label(s) (5) and secure them by means of nut (6);
 Go to section: 2.5 Installation 762 VITO Interface.
2.3

Mechanical installation of 765/766/768/365 VITO water (and temp.) probe

Install the 765 VITO water probe and the 766/768 VITO and 365 MPT water and
temperature probe on 2" or larger roof nozzle. The roof nozzle should be at best position
to detect water in the tank.
The roof nozzle counter flange must have a G ½ (½" BSP) threaded hole and an earth
screw for connection of the probe.
When the VITO probe is installed free space, suspended from the roof, it is recommended
to use anchoring weights. These weights can be a single weight of 3 kg or a chain of
weights (total weight max. 9 kg for 365 probe and 23 kg for 76x probes). Refer to
figure 4.
For coated tank bottoms, special provisions are to be taken to prevent damage of the tank
coating. One suggestion is to use a single weight and keep the weight and/or probe
suspended several centimeters above the tank floor. This height should be sufficient to
accommodate vertical tank roof movement due to bulging of the tank caused by
hydrostatic pressure exerted by the liquid stored in the tank.
When anchor weights are attached, maximum static load is:
(when Honeywell Enraf anchor weight – p/n 0815524 – is used, only use 3 weights);
Note:
The 765 VITO water probe, 766/768 VITO and 365 MPT water and temperature
probe cannot be installed in a closed well.
When the probe is installed in a well, (i.e. floating roof tank), the well must be open at the
lower end at the height of sensitive part of the water probe and the well should have
equalization holes or slots. Refer to figure 4.
When the VITO probe is installed in a well, the weight of the probe – combined with the
mechanically limited movement of the probe, is sufficient to warrant proper operation.
Caution
9 kg (20 lb) for 365 probe
23 kg (50 lb) for 76x probes.
Installation guide 762 VITO interfaces & VITO probes
Mechanical installation
Page 9