Newport PHAMP-3 User manual

Additional products from
Newport Electronics,Inc.
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This documentation may not be copied, photocopied,
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© 1995 Newport Electronics, Inc. All rights reserved.
This product may be covered by one or more
of the following patents:
United States Patents Des. 336,895; 5,274,577
France Brevet No. 91 12756
Spain 2039150
United Kingdom Patent No. 2248954
and other international patents pending
From the technical library of:
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PHAMP-3
pH Preamplifier
With Automatic Temperature Compensation
Operator’s Manual
M2266/N/0895 Newport Electronics,Inc.
Warranty
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against defective material and workmanship for a period of one (1)
year from the date of delivery.
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WARRANTY is VOID if the unit shows evidence of having been
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year only if the warranty card enclosed with each instrument is
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and
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specific problems relative to
the product.
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REPAIRS, consult NEWPORT
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able BEFORE contacting NEW-
PORT:
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product, and
3. Repair instructions and/or
specific problems relative to
the product.

PHAMP-3
pH Preamplifier TABLE OF
CONTENTS PHAMP-3
pH Preamplifier
TABLE OF
CONTENTS PHAMP-3
pH Preamplifier
TABLE OF
CONTENTS
General Description
The PHAMP-3 is a unity gain
preamplifier which converts the
high impedance mV signal of a
pH electrode to a low impedance
signal which has been compensated
for variations in temperature. The
signal can travel 1,000 feet over
ordinary wire and connectors to
process meters and controllers (such
as the IDP and INFC).
The PHAMP-3 requires an external
power source between 10-40 volt
DC. It can be powered by the
excitation of a process meter (such
as the NEWPORT IDP) or the
optional PSU-12V power supply.
The PHAMP-3 uses a l000 ohm RTD
sensor for automatic temperature
compensation. (RTD not included.
Fixed resistors must be connected
for applications not using an RTD).
The electronics are entirely
encapsulated in a compact epoxy
filled enclosure designed for easy
mounting in a manufacturing
process. The PHAMP-3 offers
redundant outputs from either a
BNC connection, terminal strip or
both at the same time. PHAMP-3 Accessories
¥ BNC-(M) to BNC-(M) 3 ft
extension cable (part number
BNC-C-36/N)
¥ 12 Volt dc power supply (part
number PSU-12 V/N).
Specifications
Output Offset: 3 mV typical; (.05 pH)
Input: -1 to 15 pH
Input Impedance: 1013 Ohms
Output Impedance: 20K Ohms
Output Voltage: 472mV to -472mmV
Operating
Temperature: 0 to 60°C
Power: 10 to 40 Vdc
Dimensions: 38.1 H x 76.2 W x 38.1mm D
(1.5" x 3" x 1.5")
INPUT
OUTPUT from Electrode
to Meter
+
+--
12345
Power
supply
Input
pH Output
to Meter
ATC
Operating Instructions
Connect as shown below:
Power supply connects to
Terminals 1&2. pH input
from electrode connects to
BNC connector. pH output
to meter(s) can be connected
to Terminals 3&4 or BNC.
RTD (1K ohm) connnects
to Terminals 4&5. (Terminal
#4 is common for pH output
& ATC).
The table (below) shows how the
millivolt output of a pH electrode
and the resistance of a 1k ½ RTD
varies with temperature. The
PHAMP-3 compensates temperature
to 25¡C.
Temperature Compensation
Temp. 0°C 25°C 40°C 50°C 70°C 90°C 100°C
pH mv. mv. mv. mv. mv. mv. mv.
0 +379.3 +414.0 +434.9 +448.8 +476.6 +504.4 +518.2
1 +325.1 +354.9 +372.8 +384.7 +408.5 +432.3 +444.2
2 +270.1 +295.8 +310.7 +320.6 +340.5 +360.3 +370.2
3 +216.8 +236.6 +248.5 +256.5 +272.4 +288.2 +296.1
4 +162.6 +177.5 +186.4 +192.4 +204.3 +216.2 +222.1
5 +108.4 +118.3 +124.2 +128.2 +136.2 +144.1 +148.1
6 +54.19 +59.15 +62.13 +64.12 +68.09 +72.05 +74.03
70000000
8 –54.19 –59.15 –62.13 –64.12 –68.09 –72.05 –74.03
9 –108.4 –118.3 –124.2 –128.2 –136.2 –144.1 –148.1
10 –162.6 –177.5 –186.4 –192.4 –204.3 –216.2 –222.1
11 –216.8 –236.6 –248.5 –256.5 –272.4 –288.2 –296.1
12 –270.1 –295.8 –310.7 –320.6 –340.5 –360.3 –370.2
13 –325.1 –354.9 –372.8 –384.7 –408.5 –432.3 –444.2
14 –379.3 –414.0 –434.9 –448.8 –476.6 –504.4 –518.2
1KΩ
RTD 1000Ω1097Ω1155Ω1194Ω1271Ω1347Ω1385Ω
Automatic Temperature
Compensation