Detcon DM-634 - Manual (Page 6)

Power Consumption
Normal operation = 28 mA (<3/4 watt); Full alarm = 85 mA (2 watts)
Output
3 relays (alarm 1, alarm 2, and fault) contact rated 5 amps @ 250 VAC, 5 amps @ 30 VDC;
Linear 4-20 mA DC; RS-485 Modbus™
Input Voltage
22.5-28 VDC
3.4 O PERATING S OFTWARE
Operating software is menu listed with operator interface via the two magnetic program switches located under the
face plate. The two switches are referred to as “PGM 1” and “PGM 2”. The menu list consists of 3 items which
include sub-menus as indicated below. (Note: see the end of this manual for a complete software f low chart.)
01. Normal Operation
a) Current Status
02. Calibration Mode
a) Span
03. Program Menu
a) Program Status
b) Alarm 1 Level
c) Alarm 2 Level
d) Set Calibration Level
3.4.1 Normal Operation
In normal operation, the display tracks the current status of the sensor and gas concentration and appears as:
“20.9 % O2”. The mA current output corresponds to the monitoring level of 0-25% O2 = 4-20 mA.
3.4.2 Calibration Mode
Calibration mode allows for sensor span adjustments. “2-SPAN”
The default span adjustment setting is 20.9% which is the normal atmospheric concentration of O2. Span gas concen-
trations other than 20.9% may be used. Refer to section 3.4.3.4 for details. “AUTO SPAN”
3.4.3 Program Mode
The program mode provides a program status menu and allows for the adjustment of alarm set point levels and the
programming of the calibration gas level setting.
3.4.3.1 Program Status
The program status scrolls through a menu that displays:
* The gas type, range of detection and software version number. The menu item appears as: “O2 0-25 V528J”
* The alarm set point level of alarm 1. The menu item appears as: “ALM1 SET @ xx.x%”
* The alarm f iring direction of alarm 1. The menu item appears as: “ALM1 DESCENDING” or ascending.
* The alarm relay latch mode of alarm 1. The menu item appears as: “ALM1 NONLATCHING” or latching.
* The alarm relay energize state of alarm 1. The menu item appears as: “ALM1 DE-ENERGIZED” or energized.
* The alarm set point level of alarm 2. The menu item appears as: “ALM2 SET @ xx.x%”
* The alarm f iring direction of alarm 2. The menu item appears as: “ALM2 DESCENDING” or ascending.
* The alarm relay latch mode of alarm 2. The menu item appears as: “ALM2 LATCHING” or nonlatching.
* The alarm relay energize state of alarm 2. The menu item appears as: “ALM2 DE-ENERGIZED” or energized.
* The alarm relay latch mode of the fault alarm. The menu item appears as: “FLT NONLATCHING” or latching.
* The alarm relay energize state of the fault alarm. The menu item appears as: “FLT ENERGIZED” or de-energized.
* The calibration gas level setting. The menu item appears as: “CalLevel @ xx.x%”
* Identif ication of the RS-485 ID number setting. The menu item appears as: “485 ID SET @ ##”
Detcon Model DM-634 Oxygen Sensor PG.6