Siemens ET 77E Series Especificaciones descargar pdf (Pagina 6)

SD77

1.0 INTRODUCTION

This manual describes the installation, operation, and maintenance of Model Series 77 Electric-to-Pneumatic

Transducers. These transducers are FM approved for installation in various National Electrical Code classified

hazardous locations. Note that particular attention must be given to the installation and maintenance of the 77F

models (see Model Designation below). These models are FM approved to be part of an intrinsically safe system

when installed and maintained according to the requirements outlined in this manual and in the installation

instructions provided by the energy limiting barrier manufacturer.

IMPORTANT

Save this Instruction and make it available for installation and maintenance of the

transducer.

The Model Series 77 E/P Transducer provides a 3 to 15 psig output that is proportional to a DC milliamp input.

Several input ranges are available as is an optional 3-27 psig output range (see Model Designation below). Other

options include: a tapped exhaust provision, 0 to 4 mA factory calibration, and reverse acting output. Each

transducer has a plate that states model designation and applicable certifications. See Figure 1-1 for a sample

nameplate

1.1 MODEL DESIGNATION

Sample Model Number 77 E 3 F N

E/P Transducer

Exhaust

Exhaust Top Housing Boosted

-- Atmosphere Aluminum No

E Tapped Aluminum No

B Atmosphere Aluminum Yes

S Atmosphere Stainless Steel No

T Tapped Stainless Steel No

Input/Output

Model No.

Entry

Input Range

(mAdc)

Output Range

(psig)

Input Impedance

(Ohms)

3 1-5 3-15 2450

3A 0-4 3-15 2450

8 4-20 3-27 610

16 4-20 3-15 185

40 10-50 3-15 30

Intrinsic Safety Electrical Classification

F = Intrinsically Safe

- Omit for all other electrical classifications

- Not available with Option R below

- Refer to Section 1.3 for ATEX installations

Options

R = Reverse acting output (e.g. 4 mA = 15 psig; 20 mA = 3 psig)

Note: Option R is not available on Series 77F

1 2 3 4 5 6 7 8 9 10 11 ... 41 42

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