Casella CEL Airborne particulate monitor (AMS950-IS) - Manual (Page 9)

AMS950IS - Aerosol Monitoring System
Handbook No. HB3235-03
4.5. Analogue
Output.
The chart recorder output is located next to the ON/OFF switch. The output impedance is
approx. 1k and follows the selected parameters chosen for the display.
The maximum displayed reading is approx. 2V, therefore on the 0-20mg/m3 range the maximum
reading would be 19.99mg/m representing 1.999V.
Thus:
1mV=
0.01mg/m3
On the higher range of 0-200 the maximum reading would be
199.9 representing 1.999V. However on this range
1mV = 0.1 mg/m3
On the higher range of 0-2000 for the 0-2000 version the maximum reading would be
1999 representing 1.999v
1mv=1mg/m³
4.6. Battery
switch.
The battery voltage can be checked by depressing the batt. button adjacent to the charging
socket. However, when displaying battery volts, it is important that the range switch is set to 0-
20mg/m³ (for the 0-200mg/m³ version) and 0-200mg/m³ (for the 0-2000mg/m³ version). when
the button is kept depressed, the L.C.D. will show the battery voltage.
0-2000 Version AMS950IS.
A reading on the L.C.D. of 73.0 (7.3v) to 75.0 (7.5v) indicates battery fully charged.
A reading on the L.C.D. of 58.0 (5.8v) and below indicates battery needs charging.
0-200 Version AMS950IS.
The 0 - 200 Version gives a direct reading of voltage.
7.3v indicates battery fully charged.
5.8v indicates battery needs charging.
The battery module has internal limiting resistors to control the amount of current available in
any short circuit condition. The operating time on a fully charged battery is approx. 8 hours.
Although a visible check on the battery voltage is available, care will have to be taken in
Issue 3/NOV 95 Page 9