System Sensor IST200 Installation And Maintenance Instructions Manual

D500-50-00

Pittway Tecnologica S.r.l, Via Caboto 19/3, 34147 Trieste, Italy

I56-2629-004

1
2

6

7

8

9

3

4

5

1

1

2

2

(+)

(-)

(+)

(-)

BEFORE INSTALLING

This information is included as a quick reference installation guide. Refer to the control
panel installation manual for detailed system information. If the IST200 will be installed in
an existing operational system, inform the operator and local authority that the system will
be temporarily out of service. Disconnect power to the control panel before installing

the IST200.
GENERAL DESCRIPTION

The IST200 Translator Module is intended for use in analogue addressable systems in
conjunction with System Sensor 22051EISE and 2251EIS intrinsically safe smoke sensors.
The IST200 Translator serves as an interface between the control panel and up to 15 of the
above sensors. It must be used in conjunction with the Y72221 Galvanic Isolator Barrier.

SPECIFICATIONS

Input Voltage (V in): 15 to 32 VDC
Output Voltage: 20 to 24 VDC
Input Current: 17mA @ V in = 15V, 9.7mA @ V in = 24V
Short circuit output current: 7.6mA Maximum
Operating Temperature Range: 0°C to 60°C
Operating Humidity Range: 5 to 95%RH
Maximum 22051EISE / 2251EIS sensors: 15

NOTE: Input currents assume there are no wiring faults and that the IST200 is loaded per

the panel manufacturer’s instructions.

MOUNTING IST200 DEVICES

The IST200 mounts directly to a 100mm square electrical box with a minimum depth of
54mm, such as the SMB500 as shown in Figure 1.

INSTALLATION AND MAINTENANCE INSTRUCTIONS

MODEL IST200 INTELLIGENT SYSTEM TRANSLATOR

For Use With Models 22051EISE & 2251EIS

Intrinsically Safe Smoke Sensor

WIRING
Notes: All wiring must conform to applicable local codes and regulations.

The IST200 translator must be mounted in a suitable electrical box.

The capacitance and inductance or inductance/resistance (L/R) ratio of

the cable connected to the hazardous area between the B501AP power
terminals (1 and 2) must not exceed the values indicated in Table 1.

1. See Figure 2 for wiring details.

2. Loop wiring from control panel to the IST200 should be shielded, and the
shield connected to ground only at the control panel. Cable from the IST200
to the barrier can be shielded, but if so, the shield should not be connected
directly to ground, but either left floating or connected to the loop input cable
shield. Cable from the barrier to the sensors can be shielded but if so, the
shield must not be connected to ground.

3. Secure translator to SMB500 mounting box as shown in Figure 1.

Table 1: Maximum Permissible Capacitance,

Inductance and Impedance Figures Across

Terminals 1 and 2 on a B501AP Base

Figure 1: IST200 Mounting in
SMB500 Surface Mount Box

SAFE AREA HAZARDOUS AREA

Y72221

Galvanic

Isolator

Figure 2: Wiring of IST200 Translator Module with Y72221 Galvanic Isolator and 22051EISE
(or 2251EIS) Intrinsically Safe Smoke Sensor Mounted in a B501AP Sensor Base

Control

Panel

Loop earth connects to the panel earth at one end of loop only

22051EISE

+ B501AP

IST200 Translator

Module

22051EISE

+ B501AP

IST200 earth
connection must
be connected
directly to earth

Cable screens Must Not be
connected to IST200 terminal 7

IST200

Group

Capacitance µFInductance mHL/R Ratio

µH/Ohm

IIC

0.083 4.2 55

IIB

0.65 12.6 210

IIA

2.15 33.6 444

(+)

(-)

(+)

(-)

11(+) (+)1
12(-) (-)2

ENGLISH

D500-50-00

Pittway Tecnologica S.r.l, Via Caboto 19/3, 34147 Trieste, Italy

I56-2629-004

110 mm

107.5 mm

1

2 3

4

5 6

7

8

9

10 11

12

20 mm

MODEL Y72221 GALVANIC ISOLATORS

The Y72221 is a single channel transformer isolated repeater especially designed and
manufactured by Pepperl and Fuchs for use as an intrinisically safe isolator between the
IST200 translator module and up to 15 22051EISE and 2251EIS optical smoke sensors.
The Y72221 is certified intrinsically safe EEx ia IIC.

SPECIFICATIONS

Voltage Range: Input (Safe Side) 20 to 24VDC
Output (To Hazardous Area) 0.6 to 24VDC
Current Range: 1 to 20mA
Short Circuit Current (Output): 65mA maximum
Working Temperature Range: -20°C to 60°C
Weight: 100g approx

INSTALLATION AND WIRING

The Y72221 should be mounted inside a suitable enclosure in the safe area. See Figures
2 and 3 for wiring details.

CAUTION

Y72221 Galvanic isolators comprise part of an intrinsically safe system for use in

potentially flammable atmospheres, and must be installed in accordance with all

appropriate international, national and local standard codes of practice and site

regulations for intrinsically safe apparatus.

Figure 3: Y72221 Galvanic
Isolator IS Barrier