Bacharach 2772-0803 manual Diagnostics, Test Mode, Keypad Function, Using the Keyboard

REMOTE INTELLIGENT SENSOR - AREA MONITOR

3.8.3FAULT RELAY. With the basic system the single (combined) gas alarm/fault relay is operated to provide external warning of any of the monitored ‘fault’ conditions. In a fault condition, the relay output ‘toggles’ open and closed at 1 Hz. When the Relay alarm Option is fitted, a separate relay output is provided which opens and remains open when a fault is detected. The fault icon and the relay output remain active until the fault condition is cleared.

3.9DIAGNOSTICS

Key system parameters are constantly moni- tored during normal operation. If any parameters fall outside acceptable values, a system fault condition is initiated and the appropriate display and relay output warnings are given. Each moni- tored condition, and the icon used on the display in warning, is detailed in Section 3.7.

3.10 TEST MODE

The TEST Mode is provided to allow users to quickly check key system parameters. This helps to ensure the system is always operating in optimum, trouble-free conditions.

It is recommended that the system parameters are checked, and recorded, at each cassette change. Section 2.8.2 explains this and how to use the TEST Mode. A record sheet is included at the end of the manual.

3.11 KEYPAD FUNCTION

Use of four keys, and the mode in which each is active, is as follows:

3.11.1‘HOLD/RELEASE’ KEY. This is a toggle. It is used to hold the displayed data/function for observation or adjustment. The display ‘holds’ for 5 minutes unless released by a second key press. This key operates in both Normal and TEST Mode.

3.11.2‘PRINT' KEY. This has two functions. Normal Mode. The key is pressed to download the data stored in the (optional) printer card memory to the printer.

TEST Mode. The key is used to clear the printer card memory (if one is fitted).

3.11.3‘15 MIN TWA (DECADE)’ KEY. There are two functions:

Normal Mode. Operation of the key displays the TWA for the preceding 15 minutes, (or 10 minutes, if this option is applicable).

TEST Mode. The switch is used to select the required decade when setting programmable values (For instance, when changing the alarm level/s or setting the date/time with the printer option fitted).

3.11.4‘8 HR TWA (DIGIT SET)’ key. Again the function depends upon the operating mode.

Normal Mode. Pressing the key initiates the TWA display for the preceding 8 hours. TEST Mode. The key is used, together with the decade select key, to select required digit.

3.12 USING THE KEYBOARD

The switches used in the keyboard are of a rugged sealed membrane type. To ensure positive operation of the key switches, press firmly.

3.13 OPTIONAL FEATURES

Several optional features are available to extend the capability of the standard RIS. These options are:

3.13.1RELAY ALARM OPTION. This can be user-retrofitted. The option provides two separate alarm relay outputs. Each has a user-adjustable set point. In addition, a separate fault relay is pro- vided. The option is available for all current RIS systems with phase 2 base boards and requires the fitting of an additional circuit board in an already provided slot.

3.13.2PRINTER INTERFACE OPTION. Can be user-retrofitted. The option provides data storage for up to 7 days of data points, a clock function and printer control circuitry. When this option board is fitted, an external printer can be plugged into the pre-wired port; or hard wired to the system interface. Option board is fitted into an already provided slot.

The printer circuit board is fitted with DIP switches to allow selection of the interval at which data points are printed. Each data point can be printed as it is calculated, or at intervals from 30 minutes to 24 hours. Printing ‘on demand’, when- ever the RIS control panel PRINTER key is pressed is also available.

In addition to the time and value of data points, a header is printed with TWA’s, system current and voltage.

3.13.3TEST CARD. The following shows how to simulate a gas alarm and enable the operation of external alarm systems to be checked.

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