NOSHOK 622 User Manual

User Manual

FM

PRESSURE

TRANSMITTERS

Series 621 and 622

Explosion-proof

(Factory Mutual and Canadian

Standards Association Approved)

®

APPROVED

US

©

NOSHOK

General

NOSHOK series 621 and 622 pressure transmitters are
approved for use in hazardous location applications as
follows:

Explosion-proof for Class I, Division 1, Groups A, B, C and
D; Dust Ignition-proof for Class II and III, Division 1, Groups
F and G. FM standards according to FMRC 3600, 3615
and 3810 and 3810. ANSI/ISA-12.27.01-2003 Approved
single seal.

These transmitters must be installed and operated
according to NEC and local codes. Improper installation or
modifications to the electrical connection will void the
hazardous approval rating.

Installation and commissioning

NOSHOK series 621 and 622 transmitters are supplied
with a 1/2″ NPT Male conduit connection with either a
6′ jacketed cable or 6′ free leads. Series 621 and 622
transmitters meet the requirements of a single seal device
as defined by ANSI/ISA 12.27.01-2003.
Series 621 has threaded process connections and model
622 has G1/2B or G1B flush diaphragm connections. Refer
to the catalog for complete specifications. Do not torque the
process connector with a force greater than 37 foot pounds.
Dust tight conduit seals must be used when installed in
Class II and Class III installations.

For the 4 mA to 20 mA output version, install the power
supply,transmitter and receiving instrument in a series
circuit to form a 2 wire loop. The transmitter regulates the
current in the loop.

The transmitter is classified for over-voltage category II
and the pollution degree 1. For the voltage output version,
the 3 wire system uses separate leads for the power
supply and output signal.The 3rd lead is a common minus.
Use a NEC Class 02 power supply, low voltage and low
current maximum 100 VA even under fault conditions.