Probe parts - MGP261 - MGP262

Items A … J refer to the probe parts illustration in the beginning of the document.

Table 1. Probe Parts

Item	Description
A	Grounding terminal: use a ≥ 4 mm2 wire to connect to the grounding rail.
B	Breather plug and lead-throughs for wiring: install cable glands to lead-throughs as required (see B2, B3, and B4) and seal unused lead-throughs. Cable glands are not provided by Vaisala. When selecting cable glands for your application, note the requirements in Guidelines for safe use in hazardous conditions.
B1	Breather plug: do not adjust.
B2	M16x1.5 wiring lead-through (1): used when wiring the external Ex ia pressure or temperature sensor input terminal.
B3	M20x1.5 wiring lead-through with removable plastic transport cover (fold sides of transport cover together and pull out). Wiring option for analog output, power supply input, and RS-485 terminals, or customer-specific additional wiring.
B4	M20x1.5 wiring lead-through for analog output, power supply input, and RS-485 terminals.
C	Tightening flange of the connection box with captive Allen screws. Loosen the captive screws with a 5 mm (3/16 in) Allen key and open the connection box to access wiring terminals.
D	Tightening nut: only tighten from the tightening nut when installing (wrench size: 50 mm (1.97 in)).
E	1.5" male NPT thread: never install the probe to any other thread type than 1.5" female NPT thread.
F	Probe filter (user-replaceable).
G	Wiring terminals for 4 … 20 mA input from external pressure or temperature sensor (Ex ia).
H	Barrier separating the intrinsically safe (Ex ia) external sensor input terminals from the analog output, power supply input, and RS-485 terminals.
I	Wiring terminals for 4 … 20 mA analog outputs, 18 … 30 VDC power supply input, and RS-485 communication.
J	Measurement cuvette with optics and CARBOCAP® sensor inside the probe filter.