SECHRIST 3500 - Page 7

TOOLS AND ACCESSORIES REQUIRED
FOR CALIBRATION AND
DISASSEMBLY/REASSEMBLY
Special SECHRIST tools and accessories are required to
calibate, disassemble and reassemble the SECHRIST Air-
Oxygen Mixer.
SPECIAL CALIBRATION AND ASSEMBLY TOOLS
(see figure 1):
SECHRIST Tool Kit (P/N 3651)
AT. 1: 1/8" spanner wrench (P/N 3654)
AT. 2: 3/8” spanner wrench (P/N 3653)
AT. 3: 5/8” spanner wrench (P/N 3652)
AT. 4: Bypass plate (P/N 3655)
Brass Plug 10-32 (P/N 3635)
Brass 10-32 x 1/16 fitting (P/N IV-310)
Rol! Pins (8) (P/N 3537)
Screws (2) 6-32 (P/N 3559)
O-rings -008 (P/N 3534)
Figure #1. Assembiv tools
GENERAL CALIBRATION AND ASSEMBLY
TOOLS:
1/16” allen wrench
5/64” allen wrench
7/64” allen wrench
9/64” allen wrench
3/16” allen wrench
1/4 * allen wrench
3/32” allen wrench
Medium blade screwdriver
7/16" open end wrench
1/2 “ open end wrench
3/4 * open end wrench
1/4 nut driver
Internal tru-arc pliers
Needle nose pliers
Soft mallet
Precision Caliper (see figure 2)
Precision Depth Micrometer (see figure 2)
Lubricant for O-rings: Krytox 240 AC (Dupont)
EQUIPMENT REQUIRED FOR TEST SYSTEM:
O, high pressure hose
Air high pressure hose
Oxygen regulator (2 stage adjustable)
Air regulator (2 stage adjustable)
Figure #2. Caliper and micrometer
Flowmeter (0 -15 LPM)
Oxygen analyzer (calibrated to +1% accuracy, readout
accurate to 1% increments)
Sampling reservoir (bottle or tube)
Pressure gauge (0-60 p.s.i.)
ROUTINE MAINTENANCE REQUIREMENT:
SECHRIST Overhaul Kit (P/N 3658)
(See APPENDIX | for Overhaul Kit parts and part numbers).
Before attempting to calibrate or repaira SECHRIST Mixer, a
qualified hospital technician should be familiar with the design
and function of the device (see UNDERSTANDING THE
AIR-OXYGEN MIXER in the SECHRIST Operational
Instructions).
The following instructions utilize a numbering system which is
to be followed in sequence. All parts are numbered and can be
reviewed on the exploded parts diagrams contained herein.
TEST PROCEDURE
In order to determine the optimal function of the SECHRIST
Mixer and the potential need for calibration. service or repair.
complete the following test procedures.
1.0 Initial Test System Set Up (see figure 3).
1.1 Connect the Mixer to clean and dry Medical
Breathing Oxygen and Medical Breathing Air
supplies which are independently adjustable
from 0 (ο 60 p.s.i.
Connect a flowmeter to the outlet of the Mixer.
Direct the flow from the flowmeter to a sampling
reservoir (i.e. bottle or tube). making sure that
no room air is being entrained to dilute the
mixture.
1.4 Insert 02 analyzer probe into sampling reservoir.
NOTE: 02 analyzer must be calibrated and accurate |
to +196.
Uy
to