Delta OHM HD45 17A, Manual

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At the end, press ESC to return to the measuring mode. The instrument will
automatically go back to the measuring mode if you don’t press any key for 30
seconds.
The quick setting mode is not protected by an access code and thresholds can be
changed only within predetermined limits, that shall be set with the following values:
Tab. 4.G: Default settings for threshold limits in HD46 models
(simplified mode)
Temperature Humidity CO
2
Threshold min. = 15.0 °C Threshold min. = 20.0 % Threshold min. = 600 ppm
Threshold max. = 25.0 °C Threshold max. = 70.0 % Threshold max. = 2000 ppm
To change intervals, hysteresis and relay activation modes, see section
“CONFIGURATION”.
In the simplified mode, the two threshold level mode is not available.
In models with keyboard, the simplified mode can be enabled by changing the P#063
parameter (see section “Configuration by means of a keyboard”).
Note: when an “M” appears on the top left side of the display (indicating access code
enabled) and the MENU key is pressed, the threshold screen is not displayed, but you
access the complete configuration mode (see section “Configuration by means of a
keyboard”).
Relay operation in “Complete mode”
When the instrument is set in complete relay operation mode, each relay is associated
with two configurable thresholds, named A and B. You can select either to make
relays operate with both thresholds or with one of the two. The relay possible
operating modes are as follows:
1. Relay always disabled
The contact is always open.
This mode is helpful in system maintenance and instrument configuration.
2. Relay always enabled
The contact is always closed.
This mode is helpful in system maintenance.
3. Relay activates below threshold B
The contact is closed if the measuring value falls below threshold B value. The
contact is open if the measuring value is above threshold.
4. Relay activates above threshold A
The contact is closed if the measuring value rises above threshold A value. The
contact is open if the measuring value is below threshold.
5. Relay activates above threshold A and below threshold B.
Relay action is different depending if threshold A value is greater or lower than
threshold B value.