User guide

ALTOSONIC V 5

2. Electrical connections

The two types of UFC-V/…-EEx Ultrasonic Flow Converter have almost the same connection

facilities, except that the standard (with optional heater) and the low-temperature version

type UFC-V/LT-EEx are provided with three additional terminals (L, N and PE) for connection

of thermostat(s) and heating element.

The figure below shows the non-intrinsically safe connection terminals of the optional

standard UFC-V/EEx version with 30 W heater and the UFC-V/LT-EEx low-temperature

version. The default standard version is identical, but without the two thermostats and

additional terminals for the heating element and thermostat T1.

1. Heating element

2. Thermostat T1

3. SMB connectors

4. Sticker with terminal

label information

5. Non-intrinsical safe

terminals

6. Thermostat T2 (under

plate)

Figure 1: Non-intrinsically safe terminals of UFC-V/LT-EEx

The connection facilities inside the approved flameproof box consist of a terminal rail with

terminals for the non-intrinsically safe connections: supply power (L, N and PE) for the five

UFC 500…-EEx electronics units, the RS485 communication units (1, 2 and ⊥) and the

supply power for the heating element and thermostat (L, N and PE), which applies for the

low-temperature version UFC-V/LT-EEx and the optional standard version with max. 30 W

heater. The ground connection consist of a cable lug that is screwed into the mounting plate

or the bulge that is casted within the bottom of the box. The mounting plate is screwed to the

bulges in the corners at the bottom of the flameproof box by four screws with spring or

toothed washers. Herewith all metal parts are electrically connected to ground potential.

The intrinsically safe ultrasonic sensor circuits are connected to the ten SMB receptacles

(two rows of five male-to-male connectors), which are screwed into the metal terminal plate

at the left side of the non-intrinsically safe terminals. The SMB receptacles are marked by the

numbers x.1 up to x.2, where x = 1 through 5. The marking consists of a white sticker with

black printed number. The SMB plugs that are to be connected to these receptacles are

marked by a yellow plastic tubing with the matching black printed number.

Equipotential bonding is established via the external bolt, which is screwed into a bulge on

the outside of the box at the base.