NoShok 625, 627, 626 Operating Manual

FM

It is important that these transmitters be installed,
operated and maintained in accordance with all NEC
and applicable codes. Also, these products may not
be modified in any way. Failure to adhere to this
requirement will void the IS approval rating.

Model 627 comes standard with a polyurethane
jacketed cable containing a strength member which
allows it to support the transmitter without additional
supports. Also, this cable has a vent tube which
provides an ambient pressure reference. The end of
the vent tube should be protected from moisture.
If moisture finds its way into the transmitter
electronics it could adversely affect the performance
of the product.

For some applications the use of a gortex filter
inserted into the end of the vent tube will be adequate.
In more humid conditions a desiccant cartridge plugged
into the end of the vent tube is recommended. A teflon
jacketed cable is available for applications that are not
compatible with the standard polyurethane material.

Wiring of all the transmitters is based upon a 4 mA
to 20 mA, 2-wire current loop. The DC power supply,
transmitter and receiving instrumentation are wired in
series. The transmitter controls the current in the loop
which is directly proportionate to the measured
pressure.

Maintenance

NOSHOK model 625, 626 and 627 transmitters
require no maintenance. They are calibrated at the
factory using pressure standards traceable to NIST.
However, models 625 and 626 have user accessible
zero and span potentiometers located under the top
cap. These are trimming adjustments with about
±10% adjustment capability. Model 627 is sealed
and does not have any user accessible adjustments.

NUMIS 03-1

CORPORATE HEADQUARTERS

1010 West Bagley Road
Berea, Ohio 44017

440.243.0888

440.243.3472 Fax
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Web: www.noshok.com

User Manual

PRESSURE & LEVEL

TRANSMITTERS

Series 625, 626 and 627

Intrinsically Safe

(Factory Mutual and Canadian

Standards Association Approved)

®

APPROVED

© US

NOSHOK

NOSHOK Model 625, 626 and 627 transmitters are

General

approved for use in hazardous location applications as
follows:

Intrinsically Safe, entity approval for Class I, II and III,
Division 1, Groups A, B, C, D, E, F and G; and Class I Zone
0 Aex ia IIC

Dust Ignition-proof for Class II and III, Division 1,
Groups E, F and G

Non incendive for Class I, Division 2, Groups A, B, C
and D

FMRC 3600, 3610, 3611, 3810 (including
supplement #1), ISA-S12.0. 01, IEC 60529 (including
amendment #1)

Installation and Commissioning

Model 625 pressure transmitter is connected to
the pressure source using the the threaded stainless
steel pressure port. Several pressure port sizes are avail­able.

Model 626 pressure transmitter incorporates a stain­less steel (or optional material) diaphragm at the end of
the pressure connection, providing a flush diaphragm
configuration. It is connected to the pressure source

using the G1/2 B or G1 B threads directly or through the
use of the available weld on adapters. Model 627 is a
submersible level transmitter and is suspended by the
attached cable in a tank. The hydrostatic pressure
produced by the liquid rising above the location of the
level transmitter is directly related to the actual liquid
level. Unless the metal body of the model 627 is
grounded directly in the mounting of the transmitter,
the drain wire in the cable needs to be grounded to a
suitable system ground. It is essential to do this for the
built in noise protection to be effective.

CLASS I, ZONE O, GROUP IIC

NON-HAZARDOUS LOCATIONHAZARDOUS (CLASSIFIED) LOCATION

CLASS I, DIVISION I, GROUPS A, B, C, AND D
CLASS I, DIVISION I, GROUPS E, F AND G
CLASS I
(NOTE 2)

625, 626 and 627 SERIES ASSOCIATED APPARATUS CONTROL EQUIPMENT

(NOTE 5)
(NOTE 6)
(NOTE 7)

ENTITY PARAMETERS:

Vmax = 30 V, 1max = 100 mA, P1 = 1 W
Ci = 22 nF (FLYING LEADS: + 0.2 nF/m). Li = 0.1 mH (FLYING LEADS: + 2 nH/m)

NOTES:

1. THE INTRINSIC SAFETY ENTITY CONCEPT ALLOWS THE INTERCONNECTION OF TWO FM APPROVED INTRINSICALLY SAFE DEVICES WITH ENTITY PARAMETERS

NOT SPECIFICALLY EXAMINED IN COMBINATION AS A SYSTEM WHEN: Uo OR Voc OR V1 ≤ Vmax, 1o OR 1sc OR 1t ≤ 1max, Ca OR Co ≥ C; + Ccable, La OR Lo ≥ Li + Lcable, Po ≤ Pi

2. DUST-TIGHT CONDUIT SEAL MUST BE USED WHEN INSTALLED IN CLASS II AND CLASS III ENVIRONMENTS

3. CONTROL EQUIPMENT CONNECTED TO THE ASSOCIATED APPARATUS MUST NOT USE OR GENERATE MORE THAN 250 Vrms OR Vdc

4. INSTALLATION SHOULD BE IN ACCORDANCE WITH ANSI / ISA RP12.6 ″ INSTALLATION OF INTRINSICALLY SAFE SYSTEMS FOR HAZARDOUS (CLASSIFIED) LOCATIONS AND THE NATIONAL ELECTRICAL CODE θ

(ANS 1 / NFPA70) SECTIONS 504 AND 505

5. THE CONFIGURATION OF ASSOCIATED APPARATUS MUST BE FACTORY MUTUAL APPROVED UNDER ENTITY CONCEPT

6. ASSOCIATED APPARATUS MANUFACTURER’S INSTALLATION DRAWING MUST BE FOLLOWED WHEN INSTALLING THIS EQUIPMENT

7. THE 625, 626, 627 SERIES ARE APPROVED FOR CLASS I, ZONE 0 APPLICATIONS. IF CONNECTING AE x [ib] ASSOCIATED APPARATUS OR AEx ib I.S. APPARATUS TO THE 625, 626 AND 627 SERIES THE

I.S CIRCUIT IS ONLY SUITABLE FOR CLASS I, ZONE I OR CLASS I, ZONE 2 AND IS NOT SUITABLE FOR CLASS I, ZONE 0 OR CLASS I, DIVISION I HAZARDOUS (CLASSIFIED) LOCATIONS

8. NO REVISION TO DRAWING WITHOUT PRIOR FACTORY MUTUAL RESEARCH APPROVAL

(NOTE 3)

+Supply 1 Red/Brown 1 A 1

+Output 2 Black/Green 3 B 2

4 mA to 20 mA 2-WIRE SYSTEM

Hirschmann Cable M12 Bendix Junction Box

Internal