Oldham BM25 Operating Manual

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- scroll down or up through pre-programmed list using the “Acknowledgment” and
“Lighting” button
- enter (to select the new name)
- acknowledge (to return to normal mode)
-
6.2. Re-initialization of MIN/MAX
Pushing Acknowledge and Lighting simultaneously restores “min and max” values to the current
measurement value. An audible beep confirms the action.
7
7
.
. ALARMS
The BM25 is equipped with two types of alarm signals:
- Visual alarms: messages in uncoded mode displayed, a 360° red light visible from all
directions
- Audible alarms two powerful horns (103 dB @ 1m.)
7.1. “Gas” alarms
• Two instant thresholds per channel for Explo, Toxic or Oxygen
• High and low thresholds on oxygen channel (2 optional low thresholds)
• 1 instant threshold on the catharometric channel.
• Exposure limit (STEL) corresponding to a sliding average of measurements over 15
minutes (depending on the country) for each channel equipped with a toxic gas sensor.
• Mean exposure (TWA) corresponding to a sliding average of measurements over eight
hours for each channel equipped with a toxic gas sensor.
Hence, as soon as the predefined alarm thresholds are exceeded on at least one channel, the gas
detector triggers a pulsed-tone audio and light signal (flashing red light). The alarm message or
messages (FAULT, ALARM, TWA, STEL, min., etc.) and the reading value appear on the display
unit.
In case of a gas alarm, the gas detector displays the maximum value detected until
acknowledgement.
7.2. Fault alarms
Faults can be classified into two categories:
Alarm types:
Gas alarm 1: two-tone
Gas alarm 2: two-tone fast
Alarm transfer: two-tone slow
Fault: single-tone

Oldham BM25 Specifications

General

Brand	Oldham
Model	BM25
Category	Measuring Instruments
Language	English