Endress+Hauser Nivotester FTL 325 P Manual

Technical Information

TI 350F/00/en Level Limit Switch

nivotester FTL 325 P

With intrinsically safe signal circuit for connection to

the Liquiphant and Soliphant measuring sensor

Applications

•Level limit detection in liquid tanks and

bulk material silos, also in hazardous

explosion areas

•For Zone 0 or Zone 20 measuring

sensors

•Liquid detection in pipes for dry

running protection for pumps

•Overspill protection for tanks with

combustible or non-combustible

liquids harmful to water

•Two-point control and level limit

detection with one switching instrument

•Application in safety related systems

with requirements for functional safety

up to SIL3 in accordance to IEC 61508

when using Liquiphant M/S with

electronic insert FEL 57

Benefits at a glance

•Intrinsically safe signal circuits [EEx ia]

for problem-free use of measuring

sensor in explosion hazardous areas

•Highest functional SIL safety (see also

Safety Manual SD 111) through:

– fault-free PFM technology

– line monitoring through to sensor

– corrosion monitoring on tuning fork of

Liquiphant M measuring sensor

•Compact housing for simple series

installation on standard rails in switch

cabinet

•Simple wiring using pluggable terminal

blocks

•Simple iterative test acc. to WHG by

connecting a Liquiphant M and S (high

temperature): one-touch operation

•High test depth: from isolating amplifier

through to measuring sensor

Functions and system design

Measuring principle Signal transmission

The intrinsically safe signal input of the Nivotester FTL 325 P limit switch is galvanically isolated

from the mains and the output.

The Nivotester powers the Liquiphant or Soliphant measuring sensors with a two-wire DC loop

and receives a frequency which signals whether or not the limit has been reached.

The power supply is superimposed with current pulses (PFM signals) from the measuring

transmitter. They have a pulse width of approx. 200 µs and a current strength of approx. 10 mA.

Signal evaluation

The Nivotester evaluates the frequency and switches the output relay for the level alarm.

The relay switching state is displayed by a yellow LED on the front panel of the Nivotester.

Fail-safe circuit

By correctly selecting the fail-safe circuit, you can ensure that the relay always works with

quiescent current safety.

•Maximum safety: the relay drops out when the switching point is exceeded

(measuring sensor covered), a fault occurs or the power supply fails.

•Minimum safety: the relay drops out when the switching point is undershot

(measuring sensor uncovered), a fault occurs or the power supply fails.

L00-FTL325Px-15-06-xx-en-001

Function of the level limit signal and the current pulse dependent on level and fail-safe circuit.

For application with requirements for functional safety in accordance to IEC 61508 (SIL),

please note Safety Manual SD 111F.

Ica.150 Hz

ca.50 Hz

Tuning fork

free

Tuning fork

covered

Level

Maximum

safety circuit

Minimum

safety circuit

Current pulseCurrent pulse

CH1...3

4 5 6

22 23 24

26 27 28

4 5 6

22 23 24

26 27 28

4 5 6

22 23 24

26 27 28

4 5 6

22 23 24

26 27 28

Function monitoring

To increase operating safety, the Nivotester is equipped with a function monitoring system.

A fault is indicated by a red LED and causes the level alarm relay in the affected channel as well

as the fault alarm to drop out. A fault is signalled when the Nivotester receives no more current

pulses. This could occur for example in the event of a short-circuit, an interruption in the signalling

line to the measuring sensor, vibrator corrosion in the Liquiphant, a defect in the measuring

sensor electronics or a defect in the input circuit of the Nivotester. The function of each channel

can be monitored by pressing the test button. The power supply to the sensor is then interrupted.

Simplified iterative test for Liquiphant M and Liquiphant S (HT)

Regular function checks are a statutory requirement for overspill protection systems. For the

Nivotester and the downstream plant sections, there is the possibility of a function test without

starting up or removing the sensor. For this reason, the Nivotester has a test button on the front

panel for each singal input. Pressing the test button interrupts the power supply. When the test

button is released, the power supply is returned to the Liquiphant and the FEL 57 and the test

phase begins. You can find detailed information on this in KA 147F.

L00-FTL325Px-19-06-xx-xx-001

Two-point control (∆s)

Two-point control is possible in one tank using the three-channel Nivotester (e.g. for pump

control). The switching hysteresis is specified by the installation location of the two measuring

sensors.

Measuring system A simple measuring device consists of one to three measuring sensors, a 1- or 3-channel

Nivotester and control or signal devices. A Liquiphant M, Liquiphant S (high temperature) or

Soliphant can be used as measuring sensor.

[Ex ia]

CH1 CH2

CH3

CH1 CH2 CH3

FTL 325 P

1-channel Nivotester FTL 325 P-#1#1

The measuring device of the 1-channel instrument consists of:

– 1 measuring sensor

– 1-channel Nivotester

– control or signal devices

L00-FTL325Px-14-06-xx-xx-001

3-channel Nivotester FTL 325 P-#3#3

There are five possible variants of the measuring device in the three-channel instrument.

L00-FTL325Px-14-06-xx-xx-002

L00-FTL325Px-14-06-xx-xx-003

1. When all three individual channels are used for measuring the level limit, the measuring

device consists of:

– 3 measuring sensors

– 3-channel Nivotester

– control or signal devices

2. When channels CH2 and CH3 are used for two-point control ∆s, the measuring device

consists of:

– 2 measuring sensors

– 3-channel Nivotester

– control or signal devices

FTL 325 P-#1#1

FTL 325 P-#3#3

CH1

CH2

CH3

FTL 325 P-#3#3

CH2

CH3

∆s

WHG SIL

L00-FTL325Px-14-06-xx-xx-004

L00-FTL325Px-14-06-xx-xx-005

L00-FTL325Px-14-06-xx-xx-006

!Note!

As CH1 is not used, the alarm must be switched to "off"!

3. When channels CH2 and Ch3 are used for two-point control ∆s and channel CH1 for overspill

protection, the measuring device consists of:

– 3 measuring sensors

– 3-channel Nivotester

– control or signal devices

4. When channel CH2 is used for measuring the level limit with two level limit relays and channel

CH1 is used for measuring other level limits, the measuring device consists of:

– 2 measuring sensors

– 3-channel Nivotester

– control or signal devices

5. When channel CH2 is used for measuring the level limit with two level limit relays, the

measuring device consists of:

– 1 measuring sensor

– 3-channel Nivotester

– control or signal devices

CH2

CH1

CH3

FTL 325 P-#3#3

∆s

WHG SIL

CH2

CH3

CH1

FTL 325 P-#3#3

CH2

CH3

CH1

FTL 325 P-#3#3

Input parameters

Measured variable The limit signal can be triggered at minimum or maximum height as required

Measuring range The measuring range is dependent on the installation location of the sensors

Input signal •Input FTL 325 P: galvanically isolated from power supply and output

•Protection type: intrinsically safe [EEx ia] IIC

•Connectable measuring sensors:

– Liquiphant DL 17 Z, with electronic insert EL 17 Z

– Liquiphant II FDL 30, FDL 31, FDL 35, FDL 36, with electronic insert FEL 37

– Liquiphant M FTL 50/51, FTL 50H/51 H, FTL 51 C, with electronic insert FEL 57

– Liquiphant S (HT) FTL 70/71, with electronic insert FEL 57

– Soliphant DM 90 Z, DM 91 Z, DM 92 Z, with electronic insert EM 17 Z

– Soliphant II FTM 30 S, FTM 31 S, FTM 32 S, with electronic insert FEM 37

•Measuring sensor power supply: from Nivotester FTL 325 P

•Connecting line: two-wire, screening unnecessary

•Line resistance: max. 25 Ωper wire

•Signal transmission: pulse frequency modulation (PFM)

Output parameters

Output signal •Relay output per channel: one potential-free switch contact for the level alarm

•Quiescent current safety circuit: minimum/maximum safety selectable with DIL switch

•Common fault signal relay: potential-free switch contact for fault signalling, of which only two

contacts are routed out

•Switch delay: approx. 0.5 s

•Switching power of the relay contacts:

U ~ max. 253 V

I ~ max. 2 A

P ~ max. 500 VA at cos ϕ≥0,7

U = max. 40 V

I = max. 2 A

P = max. 80 W

•Life: at least 105switching operations at maximum contact load

•Function displays: LEDs for operation, level alarm and fault

Overvoltage category acc.

to EN 61010

Protection class II (double or increased insulation)

Failure signal Level limit value relay dropped out; fault signal by red LEDs, fault signal relay dropped out

Galvanic isolation All input and output channels and relay contacts are galvanically isolated from each other

Power supply

Electrical connection Terminal blocks

The removable terminal blocks are separated into intrinsically safe connections (at top of the

instrument) and non-instrinsically safe connections (at bottom of the instrument). Also, the

terminal blocks have different colours to make them more easily recognisable. Blue for the

intrinsically safe section and grey for the non-intrinsically safe section. This difference helps to

ensure safe wiring.

Connecting the measuring sensor

(at upper, blue terminal blocks)

The two-wire connecting line between the Nivotester FTL 325 P and the Liquiphant or Soliphant

measuring sensor can be either a commercially available installation cable or wires in a multi-wire

cable for measuring purposes. Line resistance may be a maximum of 25 Ωper wire.

If strong electromagnetic interference is expected, e.g. from machines or radio devices, a

screened cable must be used. Only connect the screen to the ground connection, and not to the

Nivotester.

Installing the measuring sensor in explosion hazardous areas

Please observe all local regulations on explosion protection concerning the type and installation

of intrinsically safe signal cabling.

Please refer to the Safety Instructions XA 133F for maximum permissible values of capacitance

and inductance.

Connecting signalling and control devices

(at lower, grey terminal blocks)

The relay function is dependent on the level and the fail-safe circuit.

If an instrument is connected at high inductance (e.g. contactor, solenoid valve etc.), a spark

suppressor must be installed to protect the relay contact.

Connecting the supply voltage

(at lower, grey terminal blocks)

For voltage variants, see the Ordering Information on page 13.

A fuse is built into the power supply circuit. This obviates the need to connect a fine-wire fuse in

series. The Nivotester is equipped with reverse polarity protection.

Supply voltage AC version:

•Voltage range: 85...253 V AC, 50/60 Hz

DC version:

•Voltage range: 20...30 V AC / 20...60 V DC

•DC supply: max. 75 mA (1-channel)

•DC supply: max. 165 mA (3-channel)

•Permissible residual ripple within tolerance: Uss = max. 2 V

Power consumption AC

1-channel: max. 1.7 W

3-channel: max. 4.2 W

1-channel: max. 1.5 W (bei Umin 20 V)

3-channel: max. 3.3 W (bei Umin 20 V)

Accuracy

Settling time/length Final switching status after switching on the power supply: approx. 10...40 s, depending on the

connected measuring sensor.

With Liquiphant M and Liquiphant S (high temperature) note the self-test function of the FEL 57

electronic insert.

Operating conditions (Installation conditions)

Installation instructions Operating location

The Nivotester must be housed in a switch cabinet outside the explosion hazardous area.

A protective housing (IP65) for up to four 1-channel or two 3-channel Nivotesters is available for

outdoor installation.

L00-FTL325Px-11-06-xx-xx-001

Installation position

Vertical on DIN top-hat rail (TS 35 to EN 50022).

L00-FTL325xx-11-06-xx-xx-001

min. IP 65

PFM

Liquiphant FTL

Soliphant FTM

U–

CH1 CH2 CH3

FTL 325 P

EN 50022; 35 x 7,5

EN 50222, 35 x 15

[Ex ia]

CH1 CH2

CH3

CH1 CH2 CH3

FTL 325

Operating conditions (Ambient conditions)

Operating location Switch cabinet or protective housing

Permissible ambient

temperatures For single installation

•–20 °C...+60 °C (–4 °F...+140 °F)

For rail mounting without gaps

•–20 °C...+50 °C (–4 °F...+122 °F)

Storage temperature

•–20 °C...+85 °C (preferably at +20 °C)

(–4 °F...+140 °F (preferably at +68 °F))

Installation in protective housing

•–20 °C...+40 °C

•Up to four 1-channel or two 3-channel Nivotesters fit in one protective housing.

By combining these types of instrument, please note that only two 1-channel and one 3-channel

are applicable.

"Caution!

Select a mounting location which protects the instruments from weather and impacts.

Do not install them in direct sunlight. This is particularly important in regions with a warm climate.

Climatic application class 3K3

According to EN 60721-3-3

3M2

According to EN 60721-3-3

Ingress protection IP20

Electromagnetic

compatibility (EMC)

Interference emission to EN 61326; Electrical Equipment Class B

Interference immunity to EN 61326; Annex A (Industrial) and

NAMUR Recommendation NE 21 (EMC)

Mechanical construction

Construction, dimensions •Housing: plastic rail-mounting housing (Minipac construction)

•Installation: on top-hat rail to EN 50022 - 35 x 7.5 or EN 50022 - 35 x 15

•Ingress protection to EN 60529; IP20

!Note!

100 mm = 3.94 in

L00-FTL325xx-06-06-xx-xx-001

Dimensions

L00-FTL325xx-06-06-xx-xx-002

Weight •1-channel: approx. 148 g

•3-channel: approx. 250 g

min. 50 mm

min.

50 mm

min.

50 mm

FTL 325 CH3

FTL 325 CH1

FTL 325 CH1 FTL 325 CH1

? ? ? ? ?

FTL 325 CH3

FTL 325 CH1

45 mm 112 mm

95 mm

108 mm

22,5 mm

FTL 325 CH3

FTL 325 CH1

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