MTL Instruments WWIP-N Specifications

Technical data

MTL surge protection

MTL WWIP-N range

October 2015
EPS WWIP-N rev1

Transmitter protection for
water/wastewater industries

• Corrosion resistant water/wastewater field

instrument protection

• Protects 2 wire instruments

• Easy and direct mounting — screws into

spare conduit entry

• Parallel connection avoids introduction of any

resistance into loop

• High Performance low cost protection

• 10 year product warranty

The WWIP-N range of surge protection devices uniquely provide a

level of protection for 2 wire field-mounted instruments that is far in
excess of the optional transient protection facilities available from the
transmitter manufacturers - without involving any additional wiring,
conduit modifications or other expensive extras.

The WWIP-N range consists of high-power, solid-state electronics and
a gas-filled discharge tube (GDT) capable of diverting 10kA impulses.
Specially designed for the water/wastewater industry with the whole
unit encased in a corrosion resistant ANSI 316 stainless steel housing.
The units are threaded for the common conduit entries used on field
instruments. The WWIP-N is available for 1/2” NPT threaded entries.

Installation can easily be carried out retrospectively to existing
installations. The WWIP-N is screwed into any unused conduit entry
on the field instrument case and flying leads are connected to the
terminal block (+ve, -ve) and the internal earth stud. The WWIP-Ns
operate without in any way affecting normal operation - passing ac or
dc signals without attenuation while diverting surge currents safely to
earth and clamping output voltages to specific levels.

The all-important earthing connection is made to the local casing
of the transmitter with no separate earth connection or ground stake
at the transmitter being needed. In operation, the WWIP-N makes
sure that the transmitter electronics are never exposed to damaging
transients between lines or between lines and casing/earth. Any surge
current appearing as a series-mode or common-mode transient is
converted into a common-mode voltage - whereupon the transmitter
electronics are temporarily raised to some higher voltage level before
‘floating’ down automatically (and without damage) to resume normal
operation.

Measurement Technology Limited,
Great Marlings, Butterfield, Luton
Beds, LU2 8DL, UK.
Tel: + 44 (0)1582 723633 Fax: + 44 (0)1582 422283
E-mail: [e-mail]
www.mtl-inst.com

© 2015 MTL
All Rights Reserved
Publication No. EPS WWIP-N rev1 131015
October 2015

1

MTL WWIP-N range

October 2015

SPECIFICATION

Maximum surge current

10kA peak current (8/20μs waveform)

Leakage current

Less than 10μ A at max. working voltage

Working voltage

24- 48VDC

Bandwidth
1MHz
Resistance
No resistance introduced into loop
Ambient temperature limits

-40°C to +8 5°C
(-40°F to +185°F) (working)

-40°C to +8 5°C
(-40°F to +185°F) (storage)

Model WWIP-N

Nominal Voltage

Rated Voltage (MCOV)

Nominal Current

Nominal Discharge Current (8/20µs)

Max. Discharge Current (8 /20µs)

Lightning Impulse Current (10/350µs)

Residual Voltage @ i

Voltage Protection Level @ 1kV/µs

Bandwidth

Capacitance

Series Resistance

Operation Temperature Range -40ºC to +85º C

Category Tested A2, B2, C1, C2, C3, D1

Overstressed Fault Mode in=3kA 12k A

Impulse Durability (8/20µs) 10k A

Degree of Protection IP66

AC Durability 1Arms, 5 T

Service Conditions 80kPa -160kPa, 5%-95% RH

sn

U

U

i

I

max

I

imp
U

U

f

I

sn

Humidity

5% to 95% RH (non-condensing)
Electrical connections

3 flying leads (line1, line 2 & earth)
Wire size: 32/0.2 (1.0mm2, 18 AWG)
Lead length: 250mm (minimum)

Casing

ANSI 316 stainless steel hexagonal bar stock, male
thread

Threads

1/2” NPT

Weight

175 g ( 6. 2oz)

Dimensions

See figure 1

n

c

n

24- 48V

58V

N/A

3kA

10k A

1.2kA

p

p

G

C

R

95V, L-G 500V

<76V

1MHz

100 pF

N/A

TO ORDER SPECIFY: WWIP-N

2

Measurement Technology Limited,
Great Marlings, Butterfield, Luton
Beds, LU2 8DL, UK.
Tel: + 44 (0)1582 723633 Fax: + 44 (0)1582 422283
E-mail: [e-mail]
www.mtl-inst.com

© 2015 MTL
All Rights Reserved
Publication No. EPS WWIP-N rev1 131015
October 2015

Figure 1: Dimensions

EUROPE (EMEA):

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THE AMERICAS:

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ASIA-PACIFIC:

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The given d ata is only intended as a p roduct
descrip tion and shoul d not be regarde d as a legal
warrant y of properties or gu arantee. In the int erest
of further technical developments, we reserve the
right to make de sign changes.