Diagram / Installation

Dimensions

Ordering Information

T echnical Infor mation Sheet

www.novaris.com.au

72 Browns Road, Kingston Tasmania 7050 Australia

Phone +61 3 6229 7233 Fax +61 3 6229 9245 E-mail sales@novaris.com.au

SLT - Threaded Signal Line Protectors

SLT (0050-D15V1)

SCN

L1

L2

SLT1-...

SCN

L1

L2

SIG

SLT3-...

SCN

L1+

L1-

L2-

L2+

SLT4-...

SCN

N

L

L2-

L2+

SLT4-36-275

24

24

53

53

M20 x 1.5 Thread Size

1/2” NPT Thread Size

Field Instrument Surge Protectors

Novaris threaded instrument protectors provide surge protection for most

twisted pair signalling schemes and are designed to be installed directly at the

field equipment providing protection against induced surges and transients.

M20 and 1/2” NPT threads

The threaded enclosure provides an easy installation by directly screwing into a

free cable entry on the instrument. Common thread types such as M20 x 1.5 and

½” NPT threads are accommodated for. Other threads are available by request.

Multistage design

The multistage design provides a high energy gas discharge tube (GDT) as

primary protection for common mode disturbances, commonly associated with

lightning strikes and power system earth faults and a secondary metal-oxide

varistor clamping stage across the signal lines. This combination provides very

robust surge protection with high transient suppression and low let-through

voltages. In addition protection is provided for cable screens which may be open

circuit at the instrument.

SLT-Y Adapter

Where a field instrument has no free cable entry Novaris can supply a Y-piece

adapter to accommodate the threaded instrument protector and cable gland.

The SLT-Y is available in the same thread types as the SLT protectors.

Model

Signal Type

Thread Size

Hazardous Area Product

M20 x 1.5

1/2 ” NPT

SLTx-7v5

0 - 5 VDC analogue

5 V digital

-M20

-N12

IS-SLTx-7v5

SLTx-18

0 - 12 VDC analogue

12 V digital

-M20

-N12

IS-SLTx-18

SLTx-36

0 - 24 VDC analogue

4-20 mA

-M20

-N12

IS-SLTx-36

SLTx-68

0 - 48 VDC analogue

48 V digital

-M20

-N12

–

SLT4-RTD

RTD applications

Thermocouple

-M20

-N12

IS-SLT4-RTD

SLT4-36-275

4-20 mA & Power supply

-M20

on request

–