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SafeCAL: One Touch Calibration Stand Alone Gas Monitoring
System
The SafeCAL module installs in a Class ABCD (FMRC) conduit box with a glass dome. A
Delphian sensor attaches through gold plated keyed connectors and a weather-proof fitting
for easy installation and reliable operation. The entire system is sealed. All calibration
is completed without opening the explosion-proof housing.
SafeCAL will endure temperatures from -40oC (-40oF) to +85oC
(+185oF). It will operate even when its conduit box
is one third full of water. |
The SafeCAL system consists of two water and shock-resistant epoxy
encapsulated
modules, the transmitter and a processor/display. These deceptively simple components
contain a microcontroller, surge and brownout protected high efficiency electronics, RFI
protection, ample system memory and all necessary digital and analog circuitry.
SafeCAL ACCESSORIES
The
SLAM (Special Local Alarm Module)
and Extension Kit
The SafePRO (SafeCAL programmer)
For some facilites, the standalone features of the SafeCAL unit are sufficient. Others
will want to take advantage of SafeCAL's unique, lowcost optional SafePRO software for
PCs. The SafePRO option which includes PC compatible software and a hardware fixture,
allows users to program individual SafeCAL units - where you decided you need this
capability - without incurring the time and expense of returning them to the manufacturer
for re-programming.
With SafePRO you can check to see how a module is programmed, change claibration gases,
gas sensitivities, alarm parameters and alarm levels. SafePRO remembers all
apprvoed/preferred setpoints - so there is no need to learn confusing programming
sequences - and stores exactly how each SafeCAL has been programmed.
In addition the user-friendly, full color screen - with information presented in written
English - makes for an efficient PC based management of your hazardous gas monitoring
system.
HOW TO CALIBRATE A SafeCAL
see also Calibration
Calibration of a gas detector fitted with SafeCAL is
quick and simple. Various checks are performed by SafeCAL during calibration to prevent
most errors that could cause improper calibration. The display is used to guide the
calibration. During calibration the output current is held at a fixed level to prevent
alarms. All SLAM alarm relays are reset and held off. The Delphian calibrator is
required to initiate calibration. Calibration is started by momentarily placing the Zero
end of the calibrator over the CAL mark near the display.
ZERO calibration requires that the sensor be exposed to
clean air. The best way to assure accurate ZERO calibration is to apply a source of clean
or zero air to the sensor. Once this is done calibration can be initiated by touching the
ZERO end of the calibrator to the conduit box window over the designated CAL point. The
display will first respond by stepping the letter C from left to right. After a short
delay, the display will show C 0. This indicates successful ZERO calibration and readiness
for SPAN calibration.
Remove the clean air source and apply the span gas of the appropriate
concentration. Touch the SPAN end of the calibrator to the CAL point on the window. The
display will first respond by stepping the letter S from left to right. After a delay
which depends on the type of sensor being used, the display will read Cxxx, where xxx is
the concentration of the calibration gas. This indicates successful SPAN calibration.
NOTE: When a transfer factor
is programmed into SafeCAL, the display will show the concentration of the calibration gas
multiplied by the transfer factor. For instance, if your SafeCAL is programmed to detect
propane and is calibrated with 50% L.E.L. methane, the display will read C 65 instead of C
50 (the transfer factor for propane is 1.30).
NOTE: Standard calibration gas concentration is 50% of full scale. Other
concentrations can be configured into a SafeCAL. Read the metal tag supplied with your
SafeCAL for verification of calibration gas requirements.
Once the span calibration has been completed, remove the span gas. The
ambient gas concentration is being displayed and as soon the gas concentration is outside
all alarm ranges, the display will step a dash from left to right while storing the
results of the calibration in non-volatile memory. When the data has been successfully
saved, the version number will flash 3 times, followed by the gas concentration value. The
system is now operational with the new calibration parameters.
Error conditions are indicated by displaying a flashing Exxx.
The cause of the error must be removed before operation can proceed.
Calibration may be canceled
at any time by momentarily placing the
Span end of the calibrator over RESET.
See Also Stand Alone Detectors
| How to Specify a SafeCAL
system
Part Numbers | Glossary of Gas Detection Terms
Copyright ©2008 Delphian Corporation, 220 Pegasus Avenue, Northvale, N.J., U.S.A.
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