MTL Instruments MTL2215 Data sheet

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June 2004

The MTL2215 enables either one or two separate IS circuits in a
hazardous area to be relay-contact controlled by a single on/off
switch or logic signal in a safe area. Applications include the
calibration of strain-gauge bridges, changing the tone of an IS
sounder, the testing of IS fire alarms, and the transfer of safe-area
signals into an annunciator with IS input terminals not segregated from
each other. The output-relay contacts are certified as ‘non-energy­storing’ apparatus, and can be connected to any IS circuit without
further certification, provided that separate IS circuits are such that
they would still remain safe if connected together.

MTL2215 SWITCH­OPERATED RELAY

IS-output

All contacts shown in alarm condition (relay de-energised)

Changing tone of IS sounder

MTL2215

MTL2215

MTL2241

Inputting IS annunciator from safe area

Sound
alarm

SPECIFICATION

See also ‘Common specification’

Number of channels

One, fully floating

Location of control circuit

Safe area

Input/output characteristics

Relay energised if <27kΩ or <1V applied
Relay de-energised if >54kΩ or >2V applied (50V maximum)
Hysteresis, nominal: 16kΩ or 0.6V

Power supply failure protection

Relay de-energised if supply fails

Response time

50ms, nominal

Contacts (suitable for connection to IS circuits)

2-pole changeover

Contact rating (non-IS applications)

250V,5A,500VA (ac), resistive loads, reactive loads must be
suppressed
250V,5A,250W (dc), resistive loads, reactive loads must be
suppressed

Contact life expectancy (non-IS applications)

2 x 105operations at maximum load

LED indicator

ON when relay energised

Consumption

0.9 to 1.4W (ac versions)
60mA (24V dc version)

Ambient temperature limits

–20 to +55°C (all versions, close packed)
–20 to +60°C (all versions, at least 5mm apart)
–40 to +80°C (all versions, storage)

Safety description (each channel)

Non-energy-storing apparatus: relay contacts may be
connected to any certified IS circuit in Zone 0 without further
certification

Note: The 2-pole changeover contacts may be used to switch separate IS
circuits only if these remain intrinsically safe when interconnected, since the
two sets of relay contacts are not segregated from each other.

Change
tone

Annunciator
with IS
inputs

Switch

+

1

2

IS
sounder

L

N

L

N

L

N

Hazardous area

Safe area

1
2
3
4

–

5
6

+
7
8

1
2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

–

+

IS relayIS relay

10
11
12
13
14
15
16

10
11
12
13
14
15
16

10
11
12
13
14
15
16

+

9

–

+

9

–

+

9

–

+

–

+

–

+

–