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.
NOSHOK series 621 and 622 explosion-proof pressure
transmitters require no maintenance. They are calibrated
at the factory using pressure standards traceable to
N.I.S.T. There are no user available adjustments.
WIRE COLOR
4 mA to 20 mA
2-wire
+Supply RED
+Output BLACK
WIRE COLOR
Voltage Output
3-wire
+Supply RED
Common BLACK
+Output BROWN
HAZARDOUS (CLASSIFIED)
LOCATION
CLASS I, DIVISION 1, GROUPS A, B, C
AND D
CLASS II and III, DIVISION 1, GROUPS F,
AND G
PRESSURE
TRANSMITTER
621, 622
+ Output
Common
+ Supply
NON-HAZARDOUS
LOCATION
CONTROL
EQUIPMENT
POWER
SUPPLY
O,1 A
ø1.97" (50mm)
ø1.97" (50mm)
ø1.32" ±.007
(33.5mm)
ø.84"
±.007
(21.3mm)
G 1
G 1/2
1.20" ±.003
(30.5mm)
.76"
±.003
(19.4mm)
ø1.19" ±.003
(30.1mm)
ø.72" ±.007
(18.2mm)
A
A
.59" ±.007
(15mm)
.59" ±.007
(15mm)
.81" ±.012
(20.5mm)
.81" ±.012
(20.5mm)
.41"
(10.5mm)
T
O,1 A
.41"
(10.5mm)
T
x
x
x
x
1.61" (41mm)
ø1.18" ±..003
(30mm)
O-ring 1.17" x 1.41" x .08"
(29.7mm x 35.7mm
x 2.0mm)
O-ring 1.02" x .08"
(26mm x 2mm)
G 1 B
.81"
(20.5mm)
.39"
(10mm)
ø.71" ±..003
(18mm)
O
1.06" (27mm)
O-ring .73" x .94" x .08"
(18.5mm x 23.9mm
x 1.5mm)
O-ring .59" x .08"
(15mm x 2mm
G 1/2 B
.81"
(20.5mm)
.39"
(10mm)
3.60″
(91.4mm)
.50″ (12.7mm)
1.06″
(26.9
mm)
1/2″NPT
Male
conduit
1/4″
NPT
Male
3.60″
(91.4mm)
.75″
(19.1mm)
1.06″
(26.9
mm)
1/2″NPT
Male
conduit
1/2″
NPT
Male
3.60″
(91.4mm)
.50″ (12.7mm)
1.06″
(26.9
mm)
For ranges 0 psi to 30 psi and higher For ranges less than 0 psi to 30 psi
1/2″NPT
Male
conduit
1/4″
NPT
Male
G 1/2 B
G 1/2
For ranges 0 psi to 30 psi and higher For ranges less than 0 psi to 30 psi
NUMEP04-2
G 1 B
CORPORATE HEADQUARTERS
1010 West Bagley Road
Berea, Ohio 44017
440.243.0888
440.243.3472 Fax
E-mail: noshok@noshok.com
Web: www.noshok.com
G 1
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