Hach AS950 AWRS Instruction Manual

DOC346.53.80501
AS950 Refrigerated Sampler
AS950 AWRS
04/2021, Edition 6
Installation and Maintenance

Table of Contents
Section 1 Specifications........................................................................................ 3
1.1 Refrigerated Sampler and All Weather Refrigerated Sampler (AWRS)................ 3
1.2 AS950 controller................................................................................................... 4
Section 2 General information............................................................................ 6
2.1 Safety information................................................................................................. 6
2.1.1 Use of hazard information.......................................................................... 7
2.1.2 Precautionary labels................................................................................... 7
2.1.3 Compliance and certification...................................................................... 8
2.2 Product overview.................................................................................................. 9
2.3 Product components........................................................................................... 10
Section 3 Installation............................................................................................. 10
3.1 Site installation guidelines.................................................................................. 11
3.2 Prepare the sampler........................................................................................... 11
3.2.1 Clean the sample bottles.......................................................................... 11
3.2.2 Install a single bottle................................................................................. 11
3.2.3 Install multiple bottles............................................................................... 12
3.3 Plumb the sampler.............................................................................................. 13
3.4 Electrical installation........................................................................................... 15
3.4.1 Connect the sampler to power.................................................................. 15
3.4.2 Controller connections.............................................................................. 16
3.4.3 Connect a Sigma 950 or FL900................................................................ 16
3.4.4 Connect a non-Hach flow meter............................................................... 16
3.4.5 Connect a sensor..................................................................................... 19
Section 4 Startup..................................................................................................... 19
4.1 Set the instrument to on...................................................................................... 19
4.2 Preparation for use............................................................................................. 20
Section 5 Maintenance......................................................................................... 20
5.1 Clean the instrument........................................................................................... 20
5.2 Replace the desiccant........................................................................................ 21
5.3 Pump maintenance............................................................................................. 21
5.3.1 Replace the pump tubing.......................................................................... 21
5.3.2 Clean the rotor.......................................................................................... 24
5.4 Replace the distributor arm tube......................................................................... 25
5.5 Replace the power supply—refrigerated sampler............................................... 25
5.6 Disposal.............................................................................................................. 26
Section 6 Troubleshooting................................................................................. 26
6.1 General troubleshooting..................................................................................... 26
Section 7 Replacement parts and accessories......................................... 27
7.1 Bottle kits—refrigerated sampler........................................................................ 27
7.2 Bottle kits—AWRS.............................................................................................. 28
7.3 Bottle sets—refrigerated sampler and AWRS.................................................... 28
7.4 Replacement parts—refrigerated sampler and AWRS....................................... 28
7.5 Accessories—refrigerated sampler..................................................................... 29
7.6 Accessories—AWRS......................................................................................... 30
7.7 Accessories—refrigerated sampler and AWRS.................................................. 31
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Table of Contents
2

Section 1 Specifications
Specifications are subject to change without notice.
1.1 Refrigerated Sampler and All Weather Refrigerated Sampler (AWRS)
Specification Refrigerated Sampler AWRS
Dimensions (W x D x
H)1
61 x 61 x 112 cm (24 x 24 x
44 in.)
76 x 81 x 130 cm (30 x 32 x 51 in.)
Weight 63.3 kg (140 lb) 86 kg (190 lb)
Power requirements
(includes
compressor)
115 VAC, 60 Hz, 3.3 A
(18 locked rotor amps)
230 VAC, 50 Hz, 1.7 A (9 locked
rotor amps)
115 VAC, 60 Hz, 4.2 A or 6.4 A with
controller compartment heater
230 VAC, 50 Hz, 2.7 A or 4.1 A with
controller compartment heater
Overload protection Thermal overload relay, opens at
100 to 110 °C (212 to 230 °F)
115 VAC: 7.5 A circuit breaker
230 VAC: 5.0 A circuit breaker
Compressor 1/6 HP 1/5 HP
115 VAC: 115 °C (239 °F) thermal
overload protector, 7.1 locked rotor
amps
230 VAC: 120 °C (248 °F) thermal
overload protector, 7.6 A peak start
current
Operating
temperature
0 to 50 °C (32 to 122 °F) 0 to 50 °C (32 to 122 °F); with AC
battery backup: 0 to 40 ºC (32 to
104 ºF); with controller compartment
heater: –40 to 50 °C (–40 to 122 °F);
with controller compartment heater and
AC battery backup: –15 to 40 ºC (5 to
104 ºF)
Storage temperature –30 to 60 °C (–22 to 140 °F) –30 to 60 °C (–22 to 140 °F)
Relative humidity 0 to 95% 0 to 95%
Installation category,
pollution degree
II, 2 II, 2
Protection class I I
Temperature control 4 (±0.8) °C (39 (±1.5) °F) in
ambient temperatures at a
maximum of 50 °C (120 °F)
4 (±0.8) °C (39 (±1.5) °F)2
Enclosure 22-gauge steel (optional
stainless steel) with vinyl
laminate overcoat
IP24, low-density polyethylene with UV
inhibitor
1Refer to Figure 1 on page 6 for the sampler dimensions.
2Radio frequency interference in the 30 to 50 MHz range can cause a maximum temperature
change of 1.3 °C (34.3 °F). Adjust the set point temperature to 2 to 10 °C (35.6 to 50 °F) to
correct this interference.
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Specification Refrigerated Sampler AWRS
Sample bottle
capacity
Single bottle: 10 L (2.5 gal) glass or polyethylene, or 21 L (5.5 gal)
polyethylene
Multiple bottles: two 10 L (2.5 gal) polyethylene and/or glass, four 10 L
(2.5 gal) polyethylene and/or glass, eight 2.3 L (0.6 gal) polyethylene and/or
1.9 L (0.5 gal) glass, twelve 2 L (0.5 gal) polyethylene (AWRS only), twenty-
four 1 L (0.3 gal) polyethylene and/or 350 mL (12 oz.) glass
Certifications AC power supply: cETLus, CE
1.2 AS950 controller
Specification Details
Dimensions (W x H x D) 31.1 x 18.9 x 26.4 cm (12.3 x 7.4 x 10.4 in.)
Weight 4.6 kg (10 lb) maximum
Enclosure PC/ABS blend, NEMA 6, IP68, corrosion and ice resistant
Pollution degree/installation
category
3, II
Protection class II
Display ¼ VGA, color
Power requirements Refrigerated sampler: 15 VDC supplied by a power supply (115 to
220 VAC, 50/60Hz); AWRS: 15 VDC supplied by an integral power
supply
Overload protection 7 A, DC line fuse for the pump
Operating temperature 0 to 50 °C (32 to 122 °F); Refrigerated sampler: 0 to 49 °C (32 to
120 °F); AWRS with controller compartment heater: –40 to 50 °C
(–40 to 122 °F); AWRS with controller compartment heater and AC
battery backup: –15 to 40 °C (5 to 104 °F)
Storage temperature Refrigerated sampler: –40 to 60 °C (–40 to 140 °F); AWRS: –30 to
60 °C (–22 to 140 °F)
Storage/operating humidity 100% condensing
Pump Peristaltic high speed with spring-mounted Nylatron rollers
Pump enclosure Polycarbonate cover
Pump tubing 9.5 mm ID x 15.9 OD mm (3/8-in. ID x 5/8-in. OD) silicone
Pump tubing life 20,000 sample cycles with: 1 L (0.3 gal) sample volume, 1 rinse, 6-
minute pacing interval, 4.9 m (16 ft) of 3/8-in. intake tube, 4.6 m
(15 ft) of vertical lift, 21 °C (70 °F) sample temperature
Vertical sample lift 8.5 m (28 ft) for 8.8 m (29 ft) maximum of 3/8-in. vinyl intake tube at
sea level at 20 to 25 °C (68 to 77 °F)
Pump flow rate 4.8 L/min (1.25 gpm) at 1 m (3 ft) vertical lift with 3/8-in. intake tube
typical
Sample volume Programmable in 10-mL (0.34 oz) increments from 10 to 10,000 mL
(3.38 oz to 2.6 gal)
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Specification Details
Sample volume repeatability
(typical)
±5% of 200 mL sample volume with: 4.6 m (15 ft) vertical lift, 4.9 m
(16 ft) of 3/8-in. vinyl intake tube, single bottle, full bottle shut-off at
room temperature and 1524 m (5000 ft) elevation
Sample volume accuracy
(typical)
±5% of 200 mL sample volume with: 4.6 m (15 ft) vertical lift, 4.9 m
(16 ft) of 3/8-in. vinyl intake tube, single bottle, full bottle shut-off at
room temperature and 1524 m (5000 ft) elevation
Sampling modes Pacing: Fixed Time, Fixed Flow, Variable Time, Variable Flow, Event
Distribution: Samples per bottle, bottles per sample and time based
(switching)
Run modes Continuous or non-continuous
Transfer velocity (typical) 0.9 m/s (2.9 ft/s) with: 4.6 m (15 ft) vertical lift, 4.9 m (16 ft) of 3/8-in.
vinyl intake tubing, 21 °C (70 °F) and 1524 m (5000 ft) elevation
Liquid detector Ultrasonic. Body: Ultem® NSF ANSI standard 51 approved, USP
Class VI compliant. Contacting liquid detector or optional non-
contact liquid detector
Air purge An air purge is done automatically before and after each sample.
The sampler automatically compensates for different intake tube
lengths.
Tubing Intake tubing: 1.0 to 30.0 m (3.0 to 99 ft) length, ¼-in. or 3/8-in. ID
vinyl or 3/8-in. ID Teflon™-lined polyethylene with protective outer
cover (black or clear)
Wetted materials Stainless steel, polyethylene, Teflon, Ultem, silicone
Memory Sample history: 4000 records; Data log: 325,000 records; Event log:
2000 records
Communications USB and optional RS485 (Modbus)
Electrical connections Power, auxiliary, optional sensors (2x), USB, distributor arm,
optional rain gauge, thermal (AWRS only)
Analog outputs AUX port: none; optional IO9000 module: Three 0/4–20 mA
outputs to supply the recorded measurements (e.g., level, velocity,
flow and pH) to external instruments
Analog inputs AUX port: One 0/4–20 mA input for flow pacing; optional
IO9000 module: Two 0/4–20 mA inputs to receive measurements
from external instruments (e.g., third-party ultrasonic level)
Digital outputs AUX port: none; optional IO9000 module: Four low voltage,
contact closure outputs that each supply a digital signal for an alarm
event
Relays AUX port: none; optional IO9000 module: Four relays controlled
by alarm events
Certifications CE, cETLus
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Figure 1 Refrigerated sampler and AWRS dimensions
Section 2 General information
In no event will the manufacturer be liable for direct, indirect, special, incidental or consequential
damages resulting from any defect or omission in this manual. The manufacturer reserves the right to
make changes in this manual and the products it describes at any time, without notice or obligation.
Revised editions are found on the manufacturer’s website.
2.1 Safety information
The manufacturer is not responsible for any damages due to misapplication or misuse of this product
including, without limitation, direct, incidental and consequential damages, and disclaims such
damages to the full extent permitted under applicable law. The user is soley responsible to identify
critical application risks and install appropriate mechanisms to protect processes during a possible
equipment malfunction.
Please read this entire manual before unpacking, setting up or operating this equipment. Pay
attention to all danger and caution statements. Failure to do so could result in serious injury to the
operator or damage to the equipment.
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Make sure that the protection provided by this equipment is not impaired. Do not use or install this
equipment in any manner other than that specified in this manual.
2.1.1 Use of hazard information
D A N G E R
Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death or
serious injury.
WARNING
Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death
or serious injury.
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate injury.
N O T I C E
Indicates a situation which, if not avoided, may cause damage to the instrument. Information that
requires special emphasis.
2.1.2 Precautionary labels
Read all labels and tags attached to the instrument. Personal injury or damage to the instrument
could occur if not observed. A symbol on the instrument is referenced in the manual with a
precautionary statement.
This is the safety alert symbol. Obey all safety messages that follow this symbol to avoid
potential injury. If on the instrument, refer to the instruction manual for operation or safety
information.
This symbol indicates that a risk of electrical shock and/or electrocution exists.
This symbol indicates that a risk of fire is present.
This symbol indicates that the marked item can be hot and should not be touched without
care.
This symbol indicates that the item is to be protected from fluid entry.
This symbol indicates that the marked item should not be touched.
This symbol indicates a potential pinch hazard.
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This symbol indicates that the object is heavy.
This symbol indicates that the marked item requires a protective earth connection. If the
instrument is not supplied with a ground plug on a cord, make the protective earth
connection to the protective conductor terminal.
Electrical equipment marked with this symbol may not be disposed of in European
domestic or public disposal systems. Return old or end-of-life equipment to the
manufacturer for disposal at no charge to the user.
2.1.3 Compliance and certification
CAUTION
This equipment is not intended for use in residential environments and may not provide adequate
protection to radio reception in such environments.
Canadian Radio Interference-Causing Equipment Regulation, ICES-003, Class A:
Supporting test records reside with the manufacturer.
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de classe A répond à toutes les exigences de la réglementation canadienne
sur les équipements provoquant des interférences.
FCC Part 15, Class "A" Limits
Supporting test records reside with the manufacturer. The device complies with Part 15 of the FCC
Rules. Operation is subject to the following conditions:
1. The equipment may not cause harmful interference.
2. The equipment must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications to this equipment not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment. This equipment has been tested
and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules.
These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case the user will be required to
correct the interference at their expense. The following techniques can be used to reduce
interference problems:
1. Disconnect the equipment from its power source to verify that it is or is not the source of the
interference.
2. If the equipment is connected to the same outlet as the device experiencing interference, connect
the equipment to a different outlet.
3. Move the equipment away from the device receiving the interference.
4. Reposition the receiving antenna for the device receiving the interference.
5. Try combinations of the above.
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2.2 Product overview
D A N G E R
Chemical or biological hazards. If this instrument is used to monitor a treatment process
and/or chemical feed system for which there are regulatory limits and monitoring
requirements related to public health, public safety, food or beverage manufacture or
processing, it is the responsibility of the user of this instrument to know and abide by any
applicable regulation and to have sufficient and appropriate mechanisms in place for
compliance with applicable regulations in the event of malfunction of the instrument.
CAUTION
Fire hazard. This product is not designed for use with flammable liquids.
The sampler collects liquid samples at specified intervals and keeps the samples in a refrigerated
cabinet. Use the sampler for a wide variety of aqueous sample applications and also with toxic
pollutants and suspended solids. Refer to Figure 2.
Lockable cabinet door (AWRS only)
Push the round button in the center of the latch to open the door. Flip the latch to close the door tight.
Two keys are supplied for the door lock. Over time, it may be necessary to tighten the adjustment
screw on the door latch.
Controller compartment heater (AWRS only)
The controller compartment heater is a factory-installed option. The heater prevents liquid from
freezing in the tubing, extends the life of the tubing and pump components and prevents the
collection of ice and snow on the cover.
Figure 2 Refrigerated sampler and AWRS
1 Refrigerated sampler 6 Controller 11 Controller cover
2 Power supply 7 Refrigerated cabinet 12 Compartment heater
option
3 Pump 8 Cover latch 13 Door latch
4 Liquid detector 9 AWRS 14 Bottle tray
5 Non-contacting liquid
detector
10 Access cover
English 9

2.3 Product components
WARNING
Personal injury hazard. Instruments or components are heavy. Use assistance to install
or move.
The instrument weighs a maximum of 86 kg (190 lb). Do not try to unpack or move the instrument
without sufficient equipment and people to do it safely. Use correct lifting procedures to prevent
injury. Make sure that all used equipment is rated for the load, for example, a hand truck must be
rated for a minimum of 90 kg (198 lb). Do not move the sampler when filled sample bottles are in the
refrigerated cabinet.
Make sure that all components have been received. Refer to Figure 3. If any items are missing or
damaged, contact the manufacturer or a sales representative immediately.
Figure 3 Sampler components
1 Optional cover 5 All Weather Refrigerated Sampler (AWRS)
2 Refrigerated sampler 6 Intake tubing, vinyl or teflon-lined
3 Components for single-bottle option 7 Strainer
4 Components for multiple-bottle option 8 Tubing coupler3
Section 3 Installation
D A N G E R
Multiple hazards. Only qualified personnel must conduct the tasks described in this
section of the document.
3Supplied with controllers with the non-contacting liquid detector only.
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3.1 Site installation guidelines
D A N G E R
Explosion hazard. The instrument is not approved for installation in hazardous locations.
This instrument is rated for an altitude of 2000 m (6562 ft) maximum. Although the use of this
equipment above the 2000 m altitude does not show any substantial safety concern, the
manufacturer recommends that users with concerns contact technical support.
• Only install the refrigerated sampler in an indoor location. Install the AWRS in an indoor or outdoor
location.
• Make sure that the temperature at the location is in the specification range. Refer to Specifications
on page 3.
• Install the sampler on a level surface. Adjust the sampler feet to make the sampler level. Refer to
Figure 1 on page 6 for the sampler dimensions.
• Use the installed anchor brackets and user-supplied 3/8-in. bolts for the AWRS. Refer to Figure 4.
• Plumb a drain tube to the ½ in.-14 NPT female connector on the bottom of the sampler.
Figure 4 AWRS anchor bracket locations with mounting dimensions
1 Optional anchor brackets 2 Anchor brackets (2x)
3.2 Prepare the sampler
3.2.1 Clean the sample bottles
Clean the sample bottles and caps with a brush, water and a mild detergent. Flush the sample
bottles with fresh water followed by a distilled water rinse.
3.2.2 Install a single bottle
When a single bottle is used to collect one composite sample, do the steps that follow. When multiple
bottles are used, refer to Install multiple bottles on page 12.
When the bottle is full, the full bottle shut-off stops the sampling program. Install the sample bottle as
shown in Figure 5.
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Figure 5 Single bottle installation
3.2.3 Install multiple bottles
When multiple bottles are installed, a distributor arm moves the sample tube over each bottle.
Sample collection automatically stops when the specified number of samples are collected.
1. Assemble the sample bottles as shown in Figure 6. For eight or more bottles, make sure that the
first bottle is near the bottle one indicator in the clockwise direction.
2. Put the bottle assembly in the sampler. For eight or more bottles, align the wires in the slots in the
bottom tray.
12 English

Figure 6 Multiple bottle installation
1 Retainer for 24 1-L poly
bottles
4 Bottle tray for 8 to 24 bottles 7 Front of sampler
2 Retainer for 24 350-mL
glass bottles
5 Slot for bottle tray 8 Removable tray (AWRS
only)
3 Bottle one indicator 6 Floor of refrigerated
sampler
9 Insert (refrigerated sampler
only)
3.3 Plumb the sampler
Install the intake tube in the middle of the sample stream (not near the surface or bottom) to make
sure that a representative sample is collected.
1. For a sampler with the standard liquid detector, connect the tubing to the sampler as shown in
Figure 7.
Note: When Teflon-lined tubing is used, use the tubing connection kit for Teflon-lined PE tubing.
2. For a sampler with the optional non-contacting liquid detector, connect the tubing to the sampler
as shown in Figure 8.
Note: When Teflon-lined tubing is used, use the tubing connection kit for Teflon-lined PE tubing.
3. Install the intake tube and strainer in the main stream of the sample source where the water is
turbulent and well-mixed. Refer to Figure 9.
• Make the intake tube as short as possible. Refer to Specifications on page 3 for the minimum
intake tubing length.
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• Keep the intake tube at a maximum vertical slope so that the tube drains completely between
samples.
Note: If a vertical slope is not possible or if the tube is pressurized, disable the liquid detector. Calibrate the
sample volume manually.
• Make sure that the intake tube is not pinched.
Figure 7 Plumbing—Standard liquid detector
Figure 8 Plumbing—Non-contacting liquid detector
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Figure 9 Site installation
1 Strainer 2 Vertical lift 3 Mounting surface
3.4 Electrical installation
3.4.1 Connect the sampler to power
D A N G E R
Electrocution hazard. If this equipment is used outdoors or in potentially wet locations, a
Ground Fault Circuit Interrupt (GFCI/GFI) device must be used for connecting the
equipment to its main power source.
D A N G E R
Fire hazard. Install a 15 A circuit breaker in the power line. A circuit breaker can be the
local power disconnect, if located in close proximity to the equipment.
D A N G E R
Electrocution hazard. Protective Earth Ground (PE) connection is required.
WARNING
Electrocution hazard. Make sure that there is easy access to the local power disconnect.
Connect the power cord on the AWRS or both power cords on the refrigerated sampler. The
refrigerator starts after a 5-minute delay. Use a power line filter or connect the power cord for the
controller to a different branch circuit to decrease the possibility of electrical transients.
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3.4.2 Controller connections
WARNING
Electrical shock hazard. Externally connected equipment must have an applicable
country safety standard assessment.
Figure 10 shows the electrical connectors on the controller.
Figure 10 Controller connections
1 Sensor 2 port (optional) 5 USB connector
2 Thermal unit port (AWRS only) 6 Rain gauge/RS485 port (optional)
3 Power supply port 7 Auxilliary I/O port
4 Sensor 1 port (optional) 8 Distributor arm/Full bottle shut-off port
3.4.3 Connect a Sigma 950 or FL900
If sample pacing is flow based, supply the controller with a flow input signal (pulse or 4–20 mA).
Connect a Sigma 950 or an FL900 Flow Logger to the AUX I/O port.
As an alternative, connect a flow sensor to a sensor port. Refer to Connect a sensor on page 19.
Item to collect: Multi-purpose auxiliary full cable, 7 pin
1. Connect one end of the cable to the flow meter. Refer to the flow meter documentation.
2. Connect the other end of the cable to the AUX I/O port on the controller.
3.4.4 Connect a non-Hach flow meter
To connect a non-Hach flow meter to the AUX I/O port, do the steps that follow.
Items to collect: Multi-purpose auxiliary half cable, 7 pin
1. Connect one end of the cable to the AUX I/O port on the controller.
2. Connect the other end of the cable to the flow meter. Refer to Figure 11 and Table 1.
Note: In some installations, it is necessary to connect external equipment to the Pulse input, Special output
and/or Program Complete output with long cables. Since these are ground-referenced pulse interfaces, false
signaling can be caused by transient ground differences between each end of the cable. High ground
differentials are typical in heavy industrial environments. In such environments, it may be necessary to use
third-party galvanic isolators (e.g., optocouplers) in line with the affected signal(s). For the Analog input,
external ground isolation is typically not necessary because the 4–20 mA transmitter typically supplies isolation.
16 English

Figure 11 Auxiliary connector
Table 1 Half cable wiring information
Pin Signal Color4Description Rating
1 +12 VDC
power
output
White Power supply positive output.
Only use with pin 2.
Battery power to the I/O module:
12 VDC nominal; Power supply to the
I/O module: 15 at 1.0 A maximum.
2 Common Blue Negative return of power
supply. When the power
supply is used, pin 2 is
connected to earth ground5.
3 Pulse input
or Analog
input
Orange This signal is a sample
collection trigger from the
flow logger (pulse or
4–20 mA) or a simple floating
(dry) contact closure.
Pulse input—Reacts to a positive
pulse with respect to pin 2. Termination
(pulled low): pin 2 through a series
1 kΩ resistor and 10 kΩ resistor. A
7.5 zener diode is in parallel with the
10 kΩ resistor as a protection device.
Analog input—Reacts to the analog
signal that enters pin 3 and returns on
pin 2. Input burden: 100 Ω plus 0.4 V;
Input current (internal limit): 40 to
50 mA maximum6
Absolute maximum input: 0 to 15 VDC
with respect to pin 2.
Signal to make the input active: 5 to
15 V positive-going pulse7 with respect
to pin 2, 50 millisecond minimum.
4The wire color refers to the colors of multi-purpose cables. Refer to Accessories—refrigerated
sampler and AWRS on page 31.
5All mains powered equipment that connects to the controller terminals must be NRTL listed.
6Long-term operation in this state voids the warranty.
7Source impedance of the driving signal must be less than 5 kΩ.
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Table 1 Half cable wiring information (continued)
Pin Signal Color4Description Rating
4 Liquid level
input or
Auxiliary
control
input
Black Liquid level input—Start or
continue the sampling
program. A simple float level
switch can supply input.
Auxiliary control input—
Start a sampler after the
sampling program on another
sampler ends. As an
alternative, start a sampler
when a trigger condition
occurs. For example, when a
high or low pH condition
occurs, the sampling
program starts.
Termination (pulled high): internal +5 V
supply through an 11 kΩ resistance
with a series 1 kΩ resistor and 7.5 V
zener diode terminated to pin 2 for
protection. Trigger: High to low voltage
with a low pulse of 50 milliseconds
minimum.
Absolute maximum input: 0 to 15 VDC
with respect to pin 2. Signal to make
the input active: external logic signal
with 5 to 15 VDC power source. The
drive signal must be typically high. The
external driver must be able to sink
0.5 mA at 1 VDC maximum at the logic
low level.
A logic high signal from a driver with a
power source of more than 7.5 V will
source current into this input at the rate
of: I = (V – 7.5)/1000 where I is the
source current and V is the power
supply voltage of the driving logic.
Dry contact (switch) closure:
50 millisecond minimum between pin 4
and pin 2. Contact resistance: 2 kΩ
maximum. Contact current: 0.5 mA DC
maximum
5 Special
output
Red This output goes from 0 to
+12 VDC with respect to pin
2 after each sample cycle.
Refer to the Mode setting of
the hardware settings for the
AUX I/O port. Refer to the
AS950 operations
documentation.
This output has protection against short
circuit currents to pin 2. External load
current: 0.2 A maximum
Active high output: 15 VDC nominal
with AC power to the AS950 controller
or a 12 VDC nominal with battery
power to the AS950 controller.
4The wire color refers to the colors of multi-purpose cables. Refer to Accessories—refrigerated
sampler and AWRS on page 31.
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