Hach AS950 Manual

Specifications

Specifications are subject to change without notice.

1. Refer to Figure 1 for the sampler dimensions.
   

General information

In no event will the manufacturer be liable for damages resulting from any improper use of product or failure to comply with the instructions in the 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.

Use of hazard information

Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death or serious injury.

Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death or serious injury.

Indicates a potentially hazardous situation that may result in minor or moderate injury.
NOTICE
Indicates a situation which, if not avoided, may cause damage to the instrument. Information that requires special emphasis.

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.
	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.

Product overview

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.

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.

1. Refrigerator base unit
2. Power supply
3. Pump
4. Controller
5. Liquid detector
6. Non-contacting liquid detector
7. Refrigerated cabinet

Product components

Fire hazard. This product contains a flammable refrigerant. Do not damage or puncture the refrigeration circuit.

Personal injury hazard. Instruments or components are heavy. Use assistance to install or move.
The instrument weighs a maximum of 63.5 kg (140 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 68 kg (150 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.

1. Optional cover
2. Refrigerated sampler
3. Components for single-bottle option
4. Components for multiple-bottle option
5. Intake tubing, vinyl or PTFE-lined
6. Strainer
7. Tubing coupler²

2. Supplied with controllers with the non-contacting liquid detector only.

Installation

Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the document.

Site installation guidelines

Explosion hazard. The instrument is not approved for installation in hazardous locations.

Fire hazard. This product contains a flammable refrigerant. Do not damage or puncture the refrigeration circuit.

• Only install the refrigerated sampler in an indoor location that is out of direct sunlight and away from heat sources.
• Make sure that the temperature at the location is in the specification range. Refer to Specifications.
• Install the sampler on a level surface. Adjust the sampler feet to make the sampler level. Refer to Figure 1 for the sampler dimensions.
• Make sure that all airflow openings in the instrument and in the structure (if applicable) are not blocked.
• Plumb a drain tube to the ½ in.-14 NPT female connector on the bottom of the sampler.

Prepare the sampler

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.
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.
   When the bottle is full, the full bottle shut-off stops the sampling program. Install the sample bottle as shown in Figure 4.
   
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 5. For eight or more bottles, make sure that the first bottle is near the bottle one indicator in the clockwise direction.
      
      1. Retainer for 24 1-L poly bottles
      2. Retainer for 24 350-mL glass bottles
      3. Bottle one indicator
      4. Bottle tray for 8 to 24 bottles
      5. Slot for bottle tray
      6. Floor of refrigerated sampler
      7. Front of sampler
      8. Insert (refrigerated sampler only)
   2. Put the bottle assembly in the sampler. For eight or more bottles, align the wires in the slots in the bottom tray.

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 6.
   
   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 7.
   
   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.
   
   1. Strainer
   2. Vertical lift
      • Make the intake tube as short as possible. Refer to Specifications for the minimum intake tubing length.
      • 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.

Electrical installation

Connect the sampler to power

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.

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.

Electrocution hazard. Protective Earth Ground (PE) connection is required.

Electrocution hazard. Make sure that there is easy access to the local power disconnect.
Connect the power cords on the refrigerated sampler. 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.

Controller connections

Figure 9 shows the electrical connectors on the controller.

1. Sensor 2 port (optional)
2. Power supply port
3. Sensor 1 port (optional)
4. USB connector
5. Rain gauge/RS485 port (optional)
6. Auxilliary I/O port
7. Distributor arm/Full bottle shut-off port
8. 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.
   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.

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 10 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.
   

Table 1 Half cable wiring information

3. The wire color refers to the colors of multi-purpose cables. Refer to Accessories.
4. All mains powered equipment that connects to the controller terminals must be NRTL listed.
5. Long-term operation in this state voids the warranty.
6. Source impedance of the driving signal must be less than 5 kΩ.

Connect a sensor

To connect a sensor (e.g., pH or flow sensor) to a sensor port.

Startup

Set the instrument to on

The refrigerator starts after a 5-minute delay when power is supplied to the sampler. The refrigerator continues to operate when the controller is set to off or the power is removed from the controller.
Push the POWER key on the controller to set the controller to on.
To set the refrigerator to off, push the POWER key on the controller. Then, disconnect the two power cords on the refrigerated sampler.

Preparation for use

Install the analyzer bottles and stir bar. Refer to the operations manual for the startup procedure.

Maintenance

Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the document.

Electrocution hazard. Remove power from the instrument before doing maintenance or service activities.

Fire hazard. This product contains a flammable refrigerant. Do not damage or puncture the refrigeration circuit. Do not use a mechanical device or other procedure to increase the speed of a defrost cycle.

Biohazard exposure. Obey safe handling protocols during contact with sample bottles and sampler components.

Multiple hazards. The technician must make sure that the equipment operates safely and correctly after maintenance procedures.

NOTICE
Do not disassemble the instrument for maintenance. If the internal components must be cleaned or repaired, contact the manufacturer.

Clean the instrument

Fire hazard. Do not use flammable agents to clean the instrument.
NOTICE
Do not clean the controller compartment heater with liquids of any kind.
If water is not sufficient to clean the controller and the pump, disconnect the controller and move the controller away from the sampler. Allow sufficient time for the controller and pump to dry before the parts are re-installed and put back into service.
Clean the sampler as follows:

• Refrigerator — clean the condenser fins and coils as needed with a brush or vacuum.
  Note: The controller sets the temperature of the evaporator for frost-free operation. Do not use a mechanical device or other procedure to increase the speed of a defrost cycle.
• Sampler cabinet and tray — clean the internal and external surfaces of the sampler cabinet with adamp cloth and mild detergent. Do not use abrasive cleaners or solvents.

Replace the desiccant

A desiccant cartridge in the controller absorbs moisture and prevents corrosion. Monitor the desiccant color through the desiccant window. Refer to Figure 12. Fresh desiccant is orange. When the color is green, replace the desiccant.

1. Unscrew and remove the desiccant cartridge.
   
   1. Plug
   2. Desiccant tube
   3. O-ring
   4. Desiccant window
2. Remove the plug and discard the spent desiccant.
3. Fill the desiccant tube with fresh desiccant.
4. Install the plug.
5. Apply silicone grease to the O-ring.
6. Install the desiccant tube in the controller.

Pump maintenance

Pinch hazard. Remove power from the instrument before maintenance or service activities are done.

Replace the pump tubing

NOTICE
Use of tubing other than that supplied by the manufacturer can cause excessive wear on mechanical parts and/or poor pump performance.
Examine the pump tubing for wear where the rollers rub against the tubing. Replace the tubing when the tubing shows signs of wear.

Pre-requisites:

• Pump tubing—pre-cut or bulk 4.6 m or 15.2 m (15 ft or 50 ft)

1. Disconnect the power to the controller.
2. If the bulk tubing is used, cut the tubing and add alignment dots.
   
   1. To intake tubing
   2. Alignment dots
   3. To fitting on sampler base
   4. Length for controller with standard liquid detector
   5. Length for controller with optional non-contacting liquid detector
   6. Length inside the pump
   7. Length for the refrigerated sampler
   8. Length for refrigerated sampler and controller with standard liquid detector
   9. Length for refrigerated sampler and controller with non-contacting liquid detector
3. Remove the pump tubing as shown in the illustrated steps that follow.
4. Clean the silicone residue from the interior of the pump housing and from the rollers.
5. Install the new pump tubing as shown in the illustrated steps that follow.

Clean the rotor

Clean the rotor, pump tube tracks and pump housing with a mild detergent. Refer to Replace the pump tubing and the illustrated steps that follow.

Replace the distributor arm tube

The distributor arm moves over each bottle during multiple bottle sampling. Replace the tube in the distributor arm when the tube is worn. Make sure that the correct tube is used for the correct distributor and distributor arm.
Note: The distributor tubing is not the same as the pump tubing. The pump tubing installed in the distributor assembly can damage the distributor. Also, samples can be missed because the distributor arm cannot move easily.

1. Remove the tube from the distributor arm and from the ceiling of the sampler cabinet.
2. Insert the new tube into the distributor arm. Extend the tube past the end of the distributor arm 4.8 mm (3/16 in.) or 19 mm (3/4 in.) as shown in item 1 of Figure 14.
   
   1. Tube extension
   2. Nozzle
   3. Distributor arm
   4. Distributor arm lengths: 152.4 mm (6.0 in.), 177.8 mm (7.0 in.) or 190.8 mm (7.51 in.)
   5. Distributor motor
   6. Shaft
   7. Distributor tube
3. Insert the other end of the tube into the fitting on the ceiling of the sampler cabinet.
4. Complete the diagnostic test for the distributor to make sure that the operation is correct.

Replace the power supply

Fire hazard. Use only the external power supply that is specified for this instrument.
To replace the power supply for the refrigerated sampler.

Troubleshooting

General troubleshooting

Table 2 shows causes and corrective actions for several common problems.
Table 2 Troubleshooting table

Replacement parts and accessories

Personal injury hazard. Use of non-approved parts may cause personal injury, damage to the instrument or equipment malfunction. The replacement parts in this section are approved by the manufacturer.
Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to the company website for contact information.

Bottle kits

Bottle sets

Replacement parts

Accessories