REMOTE INTELLIGENT SENSOR - AREA MONITOR
When input connections have been made, and 12 volts DC is available at J1 terminals #1 & 2, leave the system connected overnight with system switch, SW1, off during the recharge.
WARNING
Each RIS power supply must be connected to line voltage by a separate circuit back to a main distribution point. The connection should not be to a circuit that is liable to be switched off at, say, the end of a shift. Failure to observe this advice can result in a deeply discharged battery, interrupted RIS operation, and premature battery failure. This is because an external interruption of power will result in RIS running on internal battery until it is discharged, unless power is restored before total discharge.
The circuit should be fused according to normal practice and provided with a switch for use during maintenance.
2.4.3OUTPUT CONNECTIONS. Connect external wiring to standard and optional features as required and according to the interface Figures
2.4.4RELAY OUTPUTS. The alarm and fault relays, combined into a single output in a basic RIS, are solid state semiconductor devices. The outputs normally present the equivalent of a closed contact to the external circuit and open on alarm or fault. The output terminals at J1 terminal strip are polarized and care is required when making connec- tion to the external circuit.
The semiconductor device specification is included in the Product Specifications and ratings should be observed.
It is recommended that external relay coils, or other devices, controlled by the RIS interface are not energized from the 12 VDC input supply to the RIS. This will avoid a possibility of overloading the power supply.
2.4.5ANALOG OUTPUTS. A 4 - 20 mA analog output is available (as default) at the interface terminal strip J1. An external analog instrument may be connected to provide remote indication of the measured concentration.
An optional 0 - 1 Volt analog output is avail- able. To set the 0 - 1 Volt output, follow the proce- dure in Section 2.7. The 20 mA, (or 1 Volt if appro- priate), represents the maximum concentration value for the particular RIS monitor.
2.5SYSTEM POWER SUPPLY CONSIDERATION & SELECTION
2.5.1RIS POWER SUPPLIES. The following standard power supplies are available, higher output alternatives can be offered where necessary. See Chapter 5 for proper Power Supplies and Part Numbers.
2.5.1.1‘Single Point’. This power supply is suitable for permanent installation to supply one RIS plus one GMD Alarm Module.
Specification:
AC Input: 100/120/220 VAC + 10% - 13%
Regulation:
Line: ± .05% for a 10% I/P change
Load: ± .05% for a 50% load change Output Ripple: 5 mV peak to peak
Short Circuit and Overload Protection: Auto current limit fold back
Temperature Rating: 0 to 50 °C full rated,
Enclosure:
NEMA 3R rain tight
Meets US 50 type 3R LEC 529.IP32 Size 6.75" H x 4.375" W x 4.375" D (172mm x 111mm x 111mm).
2.5.1.2‘Multi Point’. This power supply is suitable for permanent installation to supply multiple RIS/ Alarm combinations.
Specification:
AC Input:
Regulation: Combined Line & Load = ± 0.1%
Output Ripple: 10mV RMS
Short Circuit and Overload Protection: Auto current limit fold back
Temperature Rating: 0 to 55 °C ambient
Temperature Coefficient: 0.03%/°C
Max. Output Current: 120% rated current
=1.8x 120%=2.16A
Enclosure: NEMA 4X Size* 10"H x7"Wx6.25"D (254mm x 178mm x 159mm)
*including flanges and connectors.
The following table shows the combination of RIS’s and Alarms that may be connected to one ‘Multi Point’ supply. Practical worst case conditions are assumed to apply. See Table #1 for the High Flow models.
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