REMOTE INTELLIGENT SENSOR - AREA MONITOR
RIS TYPE | Acceptable Combinations | |||||||
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Standard |
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| 3 |
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4 |
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| 2 |
| 1 | |||
and |
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Alarm Module | 0 |
| 2 |
| 4 |
| 8 |
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High Flow |
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| 3 |
| 2 |
| 1 |
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and |
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Alarm Module |
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| 0 |
| 4 |
| 7 |
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Alarm Module |
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10 |
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NOTE: In large applications physical layout and distance between RIS’s and Alarms may make it more convenient to use some small local power supplies.
2.5.2POWER REQUIREMENTS, RIS & ALARM MODULE. Typical current consumption under a range of operating conditions are:
2.5.2.1Standard RIS Models. All Standard systems (See Table #1) have Flow Rates of 200 cc/ min. or less. This list may be incomplete because of new models introduced after publication.
The input current taken by an RIS depends upon the following factors. The battery charge state, its condition and age, the operating point in the cycle, pump current and the options fitted.
Typical input current, under several conditions:
Normal conditions, well charged battery.
Conditions and Comment | mA |
System running, no pump (as measured | 60- |
in the TEST Mode, mA test) | 90 |
System running, pump on (measure at J1 | 150- |
terminal #2, or as shown on print header) | 200 |
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Battery discharged, power just restored.
Conditions and Comment | mA |
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System running, pump on. (Current | 500- |
shown is short term peak and would | 700 |
only occur after a prolonged power |
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disruption. An old battery tends to take |
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a lower charging current) |
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2.5.2.2High Flow RIS Models. All of these systems (Table #1) have a the larger pump taking an additional current of, typically, 100 mA. All other factors are as detailed under Section 2.5.2.1.
2.5.2.3 ‘Worst Case’ Current.
Low Flow RIS. A practical ‘worst case’ current of 500 mA may be considered reasonable under most situations. Where
High Flow RIS. A practical ‘worst case’ current of 600 mA is reasonable in most circumstances; in severe conditions 650 - 800 mA may be prudent.
2.5.2.4Alarm Module. With both horn and flasher alarms operating and a well charged battery, the input current is typically 100 mA.
After a power interruption, with the battery discharged, and the alarm in the ‘standby’ state (both horn and flasher off), a practical ‘worst case’ current of 200 mA is considered reasonable.
2.5.2.5Summary: 'Worst Case' Input Currents.
Model | ‘Practical’ | ‘Extreme’ | |
| Worst Case | Worst Case | |
Low Flow | 500 mA | 700 mA |
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High Flow | 600 mA | 800 mA | |
Alarm Module | 200 mA | 250 mA | |
2.6.SAMPLE LINES
2.6.1GENERAL. The RIS is designed, tested and calibrated to give accurate measurement of the target gas when used as supplied and as directed in this manual. This particularly includes using the short input tube fitted to the RIS. The input tube, material, diameter and length have been carefully selected so that no attenuation of the sample occurs as it is drawn into the monitor for measurement.
NOTE: GMD Strongly Recommends only the original input tube be used. Refer to Section 5.3 (Recommended Spares).
2.6.2LESS REACTIVE GASES. They are less liable to be ‘lost’ in sample lines but many factors are involved. These include temperature, humidity, and sample velocity.
It may be possible with some of these gases, and under specific circumstances, to use somewhat extended sample lines. It is not possible to give more specific guidance on this subject than the following comments:
The less reactive gases referred to above include, PHOSGENE, HYDRIDES and CHLORINE. In some circumstances, it may be possible to use an input tube of up to a maximum of about 36 inches (0.91 meters) in length. The material MUST be black FEP Teflon fitted to the RIS as supplied.
Instruction | Page |