Hach 1950Plus, Инструкция по эксплуатации инструмента, Страница: 23 / 188

Section 1
Page 23
UVTOCIntroduction.fm
EPA Mode
1.10.1 Connection Information
Carrier gas and fluid connections are made at the compression fittings
located on the lower left-hand side of the analyzer. EPA mode requires the
optional dual-stream kit as shown in
Figure 5 .
Samples between 70–100 °C
(160-212 °F) can be accommodated
using an external cooler consisting
of a 3000 mm (120 in) long,
6 mm (1/4 in) O.D. stainless steel
sample inlet tube at a flow rate
of 25-60 mL/minute.
After connections are made, make certain that they are leak free.
If the analyzer is not equipped with a fast-loop sweep, the sample and/or
dilution entry port are connected to an ambient pressure source.
If the analyzer is equipped with a fast-loop sweep, the sample and dilution
(if fitted) entry port can be connected to a pressurized source of up to 6 bar
(87 psi), with a control valve (needle valve) placed on the inlet to throttle down
the flow to between 20 and 200 mL/min.
The calibration connection is also
used for introducing the validation
standard and grab sample.
Install a short standpipe of 300 mm (12 in) on the outlet leading to waste.
The outlet must be at ambient pressure.
The appropriate fittings, control valve, and tubing are user-supplied.
The connection ports on the fast-loop entry manifold are 1/8 inch NPT.
Figure 5 Inlet Configuration for the Analyzer
1. Single Stream Inlet Manifold 2. Dual Stream Inlet Manifold
Note: Make carrier gas and fluid connections as shown on lower left-hand side of the fluids cabinet.
STREAM
DILUTION
ACID
CARRIER PE
RS
ULF
ATE
ZER
O
CLEAN
VA
LID
ATIO
N
CA
LIB
RAT
IO
N
GR
AB
S
AM
PLE
ST
RE
AM
2
DIL
UT
IO
N (R
EA
R P
OR
T)
ST
RE
AM
1
AC
ID
CA
RR
IE
R
PE
RS
ULF
ATE
ZE
RO
CLE
AN
VA
LID
ATION CALIBRA
TION
GRAB SAMPLE
2 1