K-Patents PR-03 - Manual (Page 23)

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4 Accessory units 17
4 Accessory units
4.1 Separate relay units
When necessary, a K-Patents inline refractometer system can be equipped with a separate relay unit with
either four (PR-7080) or two (-WR) relays. The separate relay units can be added to any refractometer model
when additional relays are needed.
Unlike the built-in relays, both separate relay units can be configured for preconditioning and prism wash.
That is, if a prism wash (Sanitary refractometer PR-03-A and Probe refractometer PR-03-P only) is installed
because of sticky process medium, a separate relay unit is also needed.
4.1.1 Relay unit description
Both separate relay units are built in an enclosure with IP 65 (Nema 4X) classification. Figure 4.1 shows
the dimensions of the four-relay unit PR-7080 and the two-relay unit -WR.
PR-7080 -WR
Figure 4.1 Relay unit dimensions
To see the relays and to make all necessary connections, open the screws in the four top corners of the relay
enclosure and lift off the enclosure cover.
The cable fittings are delivered as one of the three alternatives:
US 1/2 NPT-TYPE ST-1 conduit hubs 4 pcs
European BF11/PG11 cable glands 4 pcs
M20x1.5 cable glands 4 pcs